MN
Which element has four valence electrons?
(1 point)
O beryllium (Be)
O potassium (K)
O sulfur (S)
O silicon (Si)
Answers
Answer:
O silicon (Si)
Explanation:
-Valence electrons are electrons of the outermost shell which can participate in chemical bonding. ... -As in silicon, four electrons are present in the outermost shell, so silicon has Four valence electrons.
Among the options given in the question, the element that has four valence electrons is known as Silicon. Thus, the correct option for this question is D.
What are Valence electrons?Valence electrons may be defined as the number of electrons that are present in the outermost shell of an element. These electrons actively take part in chemical bonding due to the sharing and pairing of electrons.
The atomic number of beryllium is 4, it has valance electrons of two. Potassium has an atomic number of 19, it has a valence electron of one. Sulfur possesses an atomic number of 16, it has valence electrons of six. While Silicon has an atomic number of 14, its electronic configuration is 2, 8, and 4. So, it has valence electrons of four.
Therefore, the element that has four valence electrons is known as Silicon. Thus, the correct option for this question is D.
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Related Questions
imagine a cell with a genetic mutation that prevents it from synthesizing functional cohesins. at what stage might the cell cycle be disrupted? support your answer with evidence from the text.
Answers
A genetic mutation that prevents a cell from synthesizing functional cohesions is likely to disrupt the later stages of the cell cycle, specifically during mitosis.
Interphase, which is made up of the G1, S, and G2 phases, and mitosis are two stages of the highly regulated cell cycle (which consists of prophase, metaphase, anaphase, and telophase). Sister chromatids are held together by cohesions during the S phase of interphase following DNA replication and to ensure appropriate segregation of them during mitosis.
Studies of cohesion-related genetic illnesses, such Roberts syndrome and Cornelia de Lange syndrome, which are brought on by cohesion gene mutations, provide evidence in favor of this. These syndromes are linked to a variety of developmental abnormalities, such as craniofacial defects, limb abnormalities and intellectual disability. It is thought that these abnormalities are brought on by cell cycle disruptions and altered gene expression patterns as a result of faulty cohesion function.
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this is for biology 1 please answer the question.
Cell membranes allow certain materials in and out of the cell. How does the structure of the cell membrane relate to its structure?
Answers
Answer:The primary function of the plasma membrane is to protect the cell from its surroundings. Composed of a phospholipid bilayer with embedded proteins, the plasma membrane is selectively permeable to ions and organic molecules and regulates the movement of substances in and out of cells.
Explanation:
. If energy is the ability to cause change, then what evidence is there that energy is produced in the interaction between the wind and the blades of the wind turbine?
Answers
Answer:
Explanation:
Wind is considered to be kinetic energy. As the kinetic energy of the wind hits the fans of the wind turbine it causes the fans to spin. This then causes the blades to spin a rotor which is connected to the main shaft of the turbine itself. This rotor spins and generates electricity. Therefore, the kinetic energy that was initially introduced into the system goes through a process and gets converted into electrical energy which we can use.
Destroys harmful substances or worn-out cell parts
Answers
It destroys harmful substances or worn-out cell parts is a cell organelle lysosome. it is present in the eukaryotic cell and helps the cell protect itself from the virus or other harmful molecules.
What is the function of the lysosomes in the cell?The lysosome that is present in the cell has maintained an acidic environment because of the active transport of hydrogen from the cytoplasm to the lysosome. Due to its acidic nature, it can degrade the harmful pathogens in the cells and also degrade worn out cells, such as old mitochondria, and in this way, the lysosome protects the cell.
Hence, lysosomes destroy harmful substances or worn-out cell parts.
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Why do traits increase within a population over time
Answers
5. Choose the best answer
Some plants bloom in the spring, while others bloom in the fall. What plant response causes this?
Answers
The plant response that causes some plants to bloom in the spring and others to bloom in the fall is photoperiodism.
Photoperiodism is the ability of plants to sense the length of daylight and darkness, which triggers different responses such as flowering.The cross breeding between the flowers growing in different seaseons are possible due to photoperiodism. Hence, it is possible to grow any flowers by maintaining certain intensity of light under green house.The stimulus from levaes exposed to light travels to shoot for flowering. This is identified as florigen and other growth hormones associated with flowering. The stimulus occurs only certain amount of light is exposed to leaves. The photoreceptors and phytochormes are involved in stimulus processing.Based on photoperiodism plants are classified into short day, long day and day neutral plants.Know more about photoperiodism here
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Which trait is common to rocks formed from magma trapped inside a volcano?
o less dense
O fine crystals
O coarse texture
O quickly cooled
Answers
Hey! The answer to your question is going to be C, coarse texture. Hope this helps!
The trait that is common to rocks formed from magma trapped inside a volcano is coarse texture. The correct option is c.
What is a volcano?Igneous rocks are formed by the cooling down of hot Lava and Magma that comes out of volcanoes. Because of how hot it is deep below the Earth, some rocks slowly melt and turn into lava, a viscous fluid.
Since magma is lighter than the surrounding solid rock, it rises and gathers in magma chambers. Some of the magma eventually surges through fissures and vents to the Earth's surface.
Magma clings onto the Earth's surface rather than becoming “stuck” there, and when it reaches that area of the planet, it begins to cool and become an extrusive rock.
Therefore, the correct option is c. coarse texture.
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21. Sickle Cell Anemia is condition that shows codominance. The genotype for normal blood cells is NN. Sickle
cell trait is the heterozygous condition (NS) and contains both normal and sickle shaped blood cells. Sickle cell
disease (SS) is when all of the blood cells are sickle-shaped and has lifelong medical implications. A man with
sickle cell trait has a child with a woman with sickle cell trait.
Complete the Punnett Square.
What is the probability of having a child with sickle cell trait?
m. What is the probability of having a normal offspring?
What is the probability of having a child with sickle cell disease?
k.
1.
n.
Answers
One of the genetic diseases known as sickle cell disease is sickle cell anemia. Red blood cells, which deliver oxygen to every region of the body, are affected in terms of structure.
What causes sickle cell anemia?Sickle cell is a hereditary condition brought on by a gene deficiency. Only when two genes—one from the mother and one from the father—are inherited together will a person be born with sickle cell disease.
The Punnett square for the cross between a man with sickle cell trait (NS) and a woman with sickle cell trait (NS) is attached below.
The probabilities for each possible offspring are:
25% chance of having a child with normal blood cells (NN)50% chance of having a child with sickle cell trait (NS)25% chance of having a child with sickle cell disease (SS)Therefore, the probability of having a child with sickle cell trait is 50%, the probability of having a normal offspring is 25%, and the probability of having a child with sickle cell disease is 25%.
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when a stimulus is applied to a receptor in the skin, an action potenetial is propagated along a neuron to the brain, where another signal is sent back to the muscle for a response. which of the fo
Answers
The probable event could be diffusion of neurotransmitter molecules across the synaptic cleft. The correct option is D.
A complicated set of processes occurs when the action potential reaches a chemical synapse at the end of an axon.
Neurotransmitter molecules are released by the presynaptic neuron into the synaptic cleft, which is a tiny space between the presynaptic neuron and the postsynaptic neuron or target cell.
These neurotransmitter molecules are subsequently transported across the synaptic cleft.
Neurotransmitters attach to certain receptor sites once they reach the postsynaptic neuron.
This binding causes changes in the membrane potential of the postsynaptic neuron, resulting in the formation of postsynaptic potentials (excitatory or inhibitory).
The integration of these potentials at the axon hillock of the postsynaptic neuron decides whether a new action potential is produced and propagated.
Thus, neurotransmitter molecule diffusion through the synaptic cleft is critical in signal transmission between neurons. The correct option is D.
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Your question seems incomplete, the probable complete question is:
When a stimulus is applied to a receptor in the skin, an action potential is propagated along a neuron to the brain, where another signal is sent back to then muscle for response.
Which of the following best describes what occurs when the action potential reaches a chemical synapse at the end of an axon
A) Release of electrical impulses from the presynaptic neuron
B) Direct transmission of the action potential to the muscle for response
C) Diffusion of neurotransmitter molecules across the synaptic cleft
D) Generation of a new action potential in the postsynaptic neuron
3. Which of the following allows a plant's vascular system to work as a transport system? (1 point)
O A plant's vascular system is made up of specialized cells that move around the plant as it grows.
OA plant's vascular system is made up of specialized cells that are covered in a thick cell wall.
O A plant's vascular system is made up of specialized cells that form straw-like tubes.
O A plant's vascular system is made up of specialized cells that divide as the plant grows.
4. What is the difference between xylem and phloem? (1 point)
O Xylem carries water and nutrients up to the plant's leaves, while phloem carries food down from the plant's leaves to its roots.
O Xylem carries water and nutrients up to the plant's leaves, while phloem divides to make more xylem cells as the plant grows.
O Xylem carries food up to the plant's leaves, while phloem carries water down from the plant's leaves to its roots.
O Xylem divides to make more phloem cells as the plant grows, while phloem carries food down from the plant's leaves to its roots. Finish | Cancel в е e w be here to search
Answers
Answer:
It is. A plant's vascular system is made up of specialized cells that form straw-like tubes. Hope this helped ;)
Which of the following are uses for the Earth's natural resources? *
Transportation
Food and drink
Homes and buildings
All of the above
Answers
Answer:
food and drink
Explanation:
i think
why must scientific names be of latin original or latinised?
Answers
Answer:
This is because Latin language is dead and, therefore, it will not change in form or spelling with the passage of time.
Explanation:
PLZ ANSWERRRR
Can having certain recessive traits help an animal fight against parasitism?
Answers
Answer: yes
Explanation: i hope that helped
Where do animals get the glucose to get energy from cellular respiration?
Answers
Answer:
Animals obtain glucose in their diet. During metabolic reactions, animal cells use glucose: to make glycogen which is stored in the liver and muscle cells to make lipids from fatty acids and glycerol All cells require glucose for respiration.
Explanation:
Answer:
oxidation of carbohydrates obtained from food.
What is MOST likely the biggest environmental problem with burning an oil slick in the ocean to remove it? A. It creates air pollution. B. The process is too slow to help wildlife. C. It only removes the top layer of oil. D. The fire kills organisms living on the surface.
Answers
Answer: The biggest environmental problem with burning an oil slick in the ocean to remove it is that the fire kills organisms living on the surface of the water. Option D is the correct answer. Burning an oil slick can create a significant amount of smoke and air pollution, but the immediate impact on surface-dwelling organisms, such as birds and fish, is the most significant concern. Additionally, burning the oil only removes the top layer, leaving behind potentially toxic residues that can still be harmful to marine life. The process can also be slow and dependent on weather conditions, making it an ineffective solution for some situations.
your welcome.
Explanation:
you measure changes in membrane potential in an on-center bipolar cell that is exposed to light in the center of its receptive field. what response would you expect to see?
Answers
The response would be Depolarization due to decreased release of glutamate by the photoreceptor cell. (Option 5)
Bipolar cells can be on or off-center. Bipolar cells get inputs from a bunch of photoreceptor cells that characterize the bipolar cell's responsive field. Glutamate is the neurotransmitter released by all photoreceptor cells. A bipolar cell that responds to glutamate by excitation will be excited when the light is off because glutamate release decreases when exposed to light. Because they are active when light is off in the center of their receptive field, these cells are referred to as off-center bipolar cells.
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(complete question)
You measure changes in membrane potential in an ON-center bipolar cell that is exposed to light in the center of its receptive field. What response would you expect to see?
Select one:
1. An action potential
2. Depolarization due to increased release of glutamate by the photoreceptor cell
3. Hyperpolarization due to decreased release of glutamate by the photoreceptor cell
4. Hyperpolarization due to increased release of glutamate by the photoreceptor cell
5. Depolarization due to decreased release of glutamate by the photoreceptor cell
Which of the following determines the gravitational force between Earth and the Moon?
Answers
Answer:
Explanation:
it is not gravity. It is difference of the accelerations of Earth and Moon. The reason he Moon does not bang into the Earth. Following is why I think this way.
Based on your experience in the simulation, what do the numbers 3 and 4 refer to in 3NH4?
Answers
Answer:
3 refers to the fact that three whole NH4 molecules are present. 4 refers to the fact that there are 4 hydrogen atoms in one NH4 molecule.
Explanation:
A number that comes before a molecule such as 5H2O or 6NaCl refers to how many of that molecule there are. A subscript added to an element in a molecule refers to how many atoms of that element are in the molecule.
Answer:
It means that there are 3 NH4 molecules, and each molecule has 4 hydrogen atoms.
Explanation:
Pneumonia is a virus or a bacteria?
Answers
Answer: Both
Explanation:
Help I don’t understand and I’m so confused and I’m doing online school please help 7-15
Answers
For questions 11-15
11. Magnesium Oxide is a combination between Magnesium and oxygen so the formula will be MgO
12. Calcium Chloride is a combination between Calcium and Chlorine, so the formula will be CaCl₂ the ₂ comes from the fact that there is two Chlorine atoms
13. Lithium Sulfide is a combination between Two lithium and a sulfur atoms,
so the formula will be Li₂S The ₂ coming from the two lithium atoms
14. Barium Selenide is a combination between Barium and Selenium so the formula will be BaSe
15. Aluminum Oxide is a combination between Aluminum and Oxygen, there are two Aluminum atoms and three Oxygen atoms, so it will make Al₂O₃
Hope this helps
The tubing contains
The tubing contains
The
beakercontains
. The
beakercontains
DONE
DONE
Answers
Answer: heres the answer....
Explanation:
during which week of pregnancy does the brain begin to develop
Answers
The brain begins to develop in the third week of pregnancy. This is when the neural tube, which eventually becomes the brain and spinal cord, begins to form. The neural tube starts as a flat sheet of cells and then folds into a tube-like structure. The top part of the tube eventually becomes the brain, while the bottom part becomes the spinal cord. As the neural tube develops, the cells within it differentiate into various types of neurons and glial cells, which are the building blocks of the nervous system. The development of the brain is a complex process that continues throughout pregnancy and beyond, but the initial formation of the neural tube is a critical first step in this process.
after sulfa drugs and penicillin were introduced, people hoped such drugs would eliminate most bacterial diseases. unfortunately, this has not happened. why is this?
Answers
After sulfa drugs and penicillin were introduced, people hoped such drugs would eliminate most bacterial diseases because, Bacteria have evolved resistance to antibiotics due to natural selection and overuse/misuse of antibiotics.
The far reaching utilization of sulfa medications and penicillin did at first diminish the occurrence of bacterial illnesses, however over the long run, numerous microbes have developed protection from these medications. This has happened because of normal choice, by which the microscopic organisms with changes that present protection from anti-microbials get by and imitate, while the non-safe microorganisms vanish. Furthermore, abuse and abuse of anti-infection agents, like taking them when they are excessive or not following through with a full tasks of treatment, has added to the improvement of anti-infection safe microbes. In this way, while anti-infection agents stay significant devices in the treatment of bacterial diseases, it is essential to utilize them sensibly to slow the development of anti-toxin safe microorganisms.
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Assignment: Unit 08 CFU
Question 11 of 20
What DNA sequence is complementary to the following:
CCG ATC AAC GAT
(5 points)
CA. GGG TÁC TTG CTA
B. GGC UAG UUG CUA
c. GGC TAG TTG CTA
Question 12 of 20
Answers
The DNA sequence complementary to CCG ATC AAC GAT would be GGC TAG TTG CTA.
DNA Base-pairingAccording to the base-pairing rule of DNA, Adenine (A) always pairs with Thymine (T) while Guanine (G) always pairs with Cytosine (C)
Thus:
Original sequence: CCG ATC AAC GAT
Complementary sequence: GGC TAG TTG CTA
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The neuromotor system can be overloaded by decreasing duration of the training and limiting exercise difficulty.
a. True
b. False
Answers
The statement is b. False. The neuromotor system, also known as the motor control system, is responsible for coordinating and executing movements in the body.
It can be trained and improved through various forms of exercise and activity. Contrary to the statement, the neuromotor system is not overloaded by decreasing the duration of training or limiting exercise difficulty.
In fact, proper training of the neuromotor system usually requires a combination of activities that challenge balance, agility, coordination, and muscular strength. Gradually increasing the duration and intensity of exercises can help improve neuromotor function and prevent overload. It is important to maintain an appropriate balance between exercise volume and intensity to avoid overloading the system, which can potentially lead to injury or reduced performance.
To summarize, the neuromotor system is not overloaded by decreasing training duration or limiting exercise difficulty. Instead, it is essential to engage in a well-rounded exercise program that focuses on various aspects of motor control and gradually progresses in difficulty and duration to promote optimal neuromotor function.
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What is one human body system we can live without?
Answers
Answer: brain
Explanation: You can still have a fairly normal life without one of your lungs, a kidney, your spleen, appendix, gall bladder, adenoids, tonsils, plus some of your lymph nodes, the fibula bones from each leg and six of your ribs.
Which renewable resource did does hydroelectricity use?
A Copper
B Wind
C Sun
D Water
Answers
Answer:
water
Explanation:
Answer:
Which renewable resource did does hydroelectricity use?
D. Water
Explanation:
water is used as a renewable resource used by hydroelectric power plants
can anybody help me with this?
Answers
Answer:
presence of sugar means that the outside of the fruits is less dilute (more concentrated in sugar than water) than the inside of the fruits
in osmosis (diffusion of water molecules), water molecules have a net movement from a more dilute substance to a less dilute substance
sugar is the less dilute substance, so water is drawn out of the fruits and mixes with the sugar around them
the sugar dissolves in water, creating a sugar solution
this results in fruits with less water inside them, and surrounded by sugar solution
Hope this helps :)))
Answer:
the grass hopper lives on land the fish lives in water.
both can see
Explanation:
which statement is true of arteries and veins? group of answer choices arteries have tunica intima, veins do not neither arteries nor veins have tunica intima veins have tunica intima, arteries do not both arteries and veins have tunica intima
Answers
The statement which is true of arteries and veins is both arteries and veins have tunica intima option D.
The inner lining of blood arteries is called the Tunica Intima. Squamous endothelial cells form a single layer in the tunica intima. Lamina that is elastic supports it. Blood passing through a blood artery directly contacts the tunica intima endothelial cells.
Blood travels through blood vessels, which are tubes that are fixedly closed. All species with a closed circulatory system have blood that passes through blood vessels. A network of capillaries, arterioles, venules, arteries, and veins make up the blood vessels. Blood veins carry nutrition, chemicals, and oxygen to various tissues while also removing waste materials like carbon dioxide from the tissue.
Blood is transported via veins back to the heart from various tissues and organs and by arteries from the heart to various tissues, i.e. away from the heart. In capillaries, numerous chemicals and gases are exchanged between the blood and tissue.
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Complete question:
Which statement is TRUE of arteries and veins?
arteries have tunica intima, veins do not
Neither arteries nor veins have tunica intima
Veins have tunica intima, arteries do not
Both arteries and veins have tunica intima
In a popular movie, a salt water fish jumped into a freshwater drain to be reunited with his father.
Using your knowledge of osmosis and solutions what would have really happened to the cells in the
fish?
А
The cells would have expanded and burst because of water entering the cells.
B
The cells would have shrunk as water left the cells.
с C
The cells would have remained the same as the freshwater is isotonic.
D
The cells would have become freshwater cells until reaching the ocean.
Answers
Answer:
A
Explanation:
fresh water is hypotonic to the fish cell,that means water will diffuse into fish cells by osmosis because a hypotonic solution contains low solute concentration.