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George asks…
Biology questions help, please, please, please, please, i appeal, i appeal, please answer it serious!?
Part A.
13.Which of the following molecules serves as the main energy-carrying compound in cells?
A) ADP B) starch C) lipids D) proteins E) ATP
14.OF which process is pyruvate the end-product?
A) Krebs Cycle B) yeast fermentation C) muscle glycolysis D) glycolysis E) cellular respiration
15.During strenous exercise, the muscles of the body will quite likely produce
A) alcohol B) lactic acid C) ATP D) glucose E) glycogen
16.The light reactions of photosynthesis take place in the
A) thylakoid membranes B) cristae C) Krebs cycle D) mitochondria matrix E) stroma
17.An end product formed in yeast fermentation is
A) carbon dioxide B) pyruvate C) lactic acid D) water E) oxygen
18.One characteristic of anaerobic respiration is that it
A) produces no ATP B) occurs only in bacteria C) requires oxygen D) begins with glycolysis E) occurs in mitochondria
19.Which of the following statements is true of photosynthesis?
A) carbon dioxide and water are end products of this process
B) glucose and carbon dioxide are the end products of this process
C) oxygen is an incidental by-product of this process
D) PGAL and water are the raw materials of this process
E) PGAL and water are the end products of this process
21.Which of the following organisms would depend most directly upon autotrophs for their source of energy?
A) carnivores B) hetetrophs C) decomposers D) omnivores E) herbivores
22. Which of the following statements best describes the process of cellular respiration?
A) it is an anabolic process occuring in mitchondria
B) it is catabolic process occuring in chloroplasts
C) it is an aerobic process requiring molecular oxygen for its occurrence
D) it is a metabolic process that only occurs in muscle cells and yeast
E) it is an anaerobic process that occurs only in eukaryotic cells
23. The Calvin cycle of photosynthesis occurs in
A) stroma of the chloroplast
B) the cristae of the mitochondria
C) the thylakoid membranes of the choroplast
D) the stroma of the mitochondria
E) the photosystems of the cholorplast
24. the carbohydrate product of the Calvin cycle is
A) starch
B) glycogen
C) glucose
D)sucrose
E) none of these
25. The leaves of green plants appear green because they
A) absorb the green wavelengths of the visible spectrum
B) absorb the yellow and blue wavelengths of the visible spectrum
C) reflect the yellow and blue wavelengths of the visible spectrum
D) reflect the green wavelengths of the visible spectrum
E) transmit the red and blue wavelengths of the visible spectrum
26. The main role of the photosystems of the chloroplasts is the
A) transformation of light energy into chemical energy in the form of energized electrons
admin answers:
In order:
E
D
B
A
A
D
C
E
C
A
C
D
there is only one choice for the last one
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Richard asks…
Would anyone mind checking my (10) biology answers?
1.) Energy is needed for
A) diffusion
B) active transport <<
C) osmosis
D) passive transport
2.) What is the term for metabolic pathways that release stored energy by breaking down complex molecules?
A) anabolic pathways
B) catabolic pathways <<
C) fermentation pathways
D) thermodynamic pathways
E) bioenergetic pathways
3.) Energy ____________________
A) cannot be created or destroyed
B) can change from one form to another
C) tends to disperse spontaneously
D) all of the above <<
4.) Are chemical reactions at equilibrium in living cells?
A) yes
B) no <<
C) only the exergonic reactions
D) all reactions except those powered by ATP hydrolysis
5.) Enzymes _______________.
A) are generally proteins
B) lower the activation energy of a reaction
C) are destroyed by the reactions they catalyze
D) a and b <<
E) b and c
6.) Adenosine monophosphate (AMP) activates the enzyme phosphofructokinase (PFK) by binding at a site distinct from the substrate binding site. This is an example of
A) cooperative activation
B) allosteric activation <<
C) activation by an enzyme cofactor
D) coupling exergonic and endergonic reactions
7.) When molecules are broken apart in respiration
A) the heat produced is used to drive biological reactions
B) the oxygen in the compounds that are broken apart is used as an energy source
C) the energy released in respiration is channeled into molecules of ATP
D) ATP is converted into ADP <<
E) ADP is released as a waste product
8.) The correct operational sequence of the three processes listed below is
A) glycolysis – electron transfer – Krebs
B) electron transfer – glycolysis – Krebs
C) Krebs – glycolysis – electron transfer
D) electron transfer – Krebs – glycolysis
E) glycolysis – Krebs – electron transfer <<
9.) Glycolysis
A) occurs in the mitochondria
B) results in the production of Acetyl-CoA
C) occurs in the Krebs Cycle
D) occurs in the mitochondria and results in the production of pyruvate
E) results in the production of pyruvate and occurs in the cytoplasm <<
10.) To sustain high rates of glycolysis under anaerobic conditions, cells require
A) functioning mitochondria
B) oxygen
C) oxidative phosphorylation of ATP
D) NAD+ <<
E) All of the above are correct
I appreciate any help you can provide, thanks in advance
admin answers:
One wrong
7.) When molecules are broken apart in respiration
C) the energy released in respiration is channeled into molecules of ATP
That’s the last step in your answer to question 8. What you are describing is the first step in glycolysis.
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Ken asks…
Biooo help, pleasee<333?
2. Which of these is not a component of a molecule of adenosine triphosphate (ATP)?
A) adenosine
B) phosphate
C) deoxyribose sugar
D) ribose sugar
3. Glycolysis is a sequence of ______ chemical reactions.A) nine
B) six
C) five
D) ten
4. Exergonic reactions produce products with a ___ energy level than that of the initial reactants.A) lower
B) higher
C) the same
5. When chemical X is reduced, which of these expressions would be an accurate representation of its reduced state?A) XO
B) XH
C) X
6. Most enzymes are which kind of organic compound?A) carbohydrates
B) lipids
C) proteins
D) none of the above
7. The area on an enzyme where the substrate attaches is called the:A) active site
B) allosteric site
C) anabolic site
D) inactive site
8. Which of the following creatures would not be an autotroph?A) cactus
B) cyanobacteria
C) fish
D) palm tree
9. The process by which most of the world’s autotrophs make their food is known as:A) glycolysis
B) photosynthesis
C) chemosynthesis
D) herbivory
10. Plants are the only organisms that use ATP for the transfer and storage of energy.
A) True
B) False
11. The colors of light in the visible range (from longest wavelength to shortest) are:A) ROYGBIV
B) VIBGYOR
C) GRBIYV
D) ROYROGERS
12. Chlorophyll is a green pigment because it absorbs only the green part of the visible light spectrum.
A) True
B) False
13. The photosynthetic pigment that is essential for the process to occur is:A) chlorophyll a
B) chlorophyll b
C) beta carotene
D) xanthocyanin
14. A photosystem is:A) a collection of hydrogen-pumping proteins
B) a collection of photosynthetic pigments arranged in a thylakoid membrane
C) a series of electron-accepting proteins arranged in the thylakoid membrane
D) found only in prokaryotic organisms
15. Which of these molecules is NOT a product of the Electron Transport System?A) ATP
B) Water
C) Pyruvate
D) NAD+
16. The dark reactions require all of these chemicals to proceed except:A) ATP
B) NADPH
C) carbon dioxide
D) oxygen
17. The structural unit of photosynthesis, where the photosystems are located, are called:A) chlorophylls
B) eukaryotes
C) stroma
D) thylakoids
18. Which of the following does NOT occur during the light independent process?A) CO2 is used to form carbohydrates
B) NADPH converts to NADP
C) ADP converts to ATP
D) ATP converts to ADP
19. The production of ATP that occurs in the presence of oxygen is called:A) aerobic respiration
B) anaerobic respiration
C) chemiosmosis
D) photosynthesis
20. The first stable chemical formed by the Calvin Cycle is:A) RuBP
B) RU/18
C) PGA
D) PGAL
21. Which of these molecules is not produced by glycolysis?A) ATP
B) NADH
C) pyruvate
D) FADH2
22. Where in a eukaryotic cell do the reactions of glycolysis occur?A) cytoplasm
B) mitochondrion matrix
C) mitochondrion cristae
D) chloroplast thylakoid
23. Where in a prokaryotic cell do the reactions of glycolysis occur?A) cytoplasm
B) nucleiod
C) ribosome
D) cytoplasmic thylakoid
24. During cellular respiration at low oxygen conditions, which of the following will be formed in a human cell?A) alcohol
B) carbon dioxide
C) lactate
D) b and c
25. Which of these processes is used to make the ATP produced by glycolysis?A) chemiosmosis
B) substrate-level phosphorylation
C) enzyme-mediated hydrolysis
D) none of these are the correct process
26. Krebs cycle produces all of the following chemicals except:A) NADH
B) ATP
C) oxygen
D) FADH2
27. Krebs cycle occurs in the ___ of a eukaryotic cell.A) matrix of the mitochondrion
B) cristae membranes of the mitochondrion
C) nucleus
D) cytoplasm
28. The first release of carbon dioxide during aerobic respiration happens during the:A) Krebs cycle
B) Electron Transport System
C) transition reaction
D) chemiosmotic synthesis of ATP
29. The NADH that enters the Electron Transport System is produced by all of the following processes except:A) glycolysis
B) transition reaction
C) fermentation
D) Krebs cycle
30. When NADH passes its electrons into the Electron Transport System, NADH is chemically:A) oxidized
B) enzymized
C) hydrolysed
D) reduced
31. Which of these molecules is not formed by the activity of the Electron Transport System?A) NAD+
B) oxygen
C) FAD
D) water
admin answers:
2) C
6) C
7) A
C (note: autotrophs produce their own food, fish is not one b/c it must eat something for food)
10) false
12) false
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John asks…
Some BIO questions I really need help on
EXPLANATIONS!!! (6 questions)?
Which of the statements is INCORRECT about the following reaction?
1. Phosphoenolpyruvate + ADP ? Pyruvate + ATP (?G = -7.5 kCal/mole)
Choose one answer.
a. It is anabolic.
b. It is catabolic.
c. It can be used to drive an endergonic reaction.
d. The synthesis of ATP occurs by substrate-level phosphorylation.
e. It is a reaction that yields energy.
I think that the answer is a, but can someone explain why
2.The equation, C6H12O6 + 6O2 ? 6CO2 + 6H2O (ATP + Heat), describes a reaction that
Choose one answer.
a. is endergonic.
b. requires energy.
c. occurs in plants only.
d. is exergonic.
e. is anabolic.
I think this one is d.
3. The equation, C6H12O6 + 6O2 ? 6CO2 + 6H2O (ATP + Heat), describes which of the following processes?
Choose one answer.
a. photosynthesis
b. cell respiration
c. cell fermentation
d. glycolysis
e. anaerobic metabolism
I think this one is b.
4.Which of the following reactions would require the hydrolysis of exactly two ATP molecules (?G = -14.6 kCal) for it to occur?
Choose one answer.
a. A reaction that has a ?G = -8 kCal.
b. A reaction that has a ?G = +8 kCal.
c. A reaction that has a ?G = -16 kCal.
d. A reaction that has a ?G = +7.3 kCal.
e. A reaction that has a ?G = -14.6 kCal.
This one im not totally sure about because i thought it would be -7.3, but i guess there will be energy lost so would the answer be -8?
5.Altering the three-dimensional structure of an enzyme might
Choose one answer.
a. change the amount of energy needed for a reaction.
b. prevent the substrate from binding the enzyme’s active site.
c. change the type of substrate that binds the enzyme’s active site.
d. change the type of product produced in the reaction.
This one im not positive on but I think it’s b
6.Which of the following is the energy source for driving ATP synthase and the production of ATP in cellular respiration?
Choose one answer.
a. The electron transport chain pumping H+ from the mitochondrial matrix into the intermembrane space.
b. The flow of electrons down the electron transport chain.
c. The loss in free energy that occurs as an electron moves down the transport chain.
d. The H+ electrochemical gradient across the inner mitochondria membrane.
e. The ability of oxygen to rapidly capture an electron and energize ATP synthase.
I think the answer is d
Thanks so much for your help! Best answer goes to those who have explanations!
Okay 3 more questions that I don’t get.
1.The equation, C6H12O6 + 6O2 ? 6CO2 + 6H2O (ATP + Heat), describes a reaction that
a. is endergonic.
b. requires energy.
c. occurs in plants only.
d. is exergonic.
e. is anabolic.
D?
2.The equation, C6H12O6 + 6O2 ? 6CO2 + 6H2O (ATP + Heat), describes which of the following processes?
a. photosynthesis
b. cell respiration
c. cell fermentation
d. glycolysis
e. anaerobic metabolism
B?
3. Which of the following is the energy source for driving ATP synthase and the production of ATP in cellular respiration?
a. The electron transport chain pumping H+ from the mitochondrial matrix into the intermembrane space.
b. The flow of electrons down the electron transport chain.
c. The loss in free energy that occurs as an electron moves down the transport chain.
d. The H+ electrochemical gradient across the inner mitochondria membrane.
e. The ability of oxygen to rapidly capture an electron and energize ATP synthase
D?
admin answers:
1. I think this one is B, primarily because phosphoenolpyruvate is being broken down into pyruvate. A catabolic reaction is one where you break down a molecule.
2. I agree with you on this one. Energy is released as a product, so it would be exergonic
3. I agree with you on this one, too.
4. The delta G for the reaction would be positive if you have to use up ATP for the reaction to happen. Since the question is implying that you’re using 2 ATP molecules for this, you can eliminate all the negative numbers. This leaves you +7.3 and +8. The question also says EXACTLY 2 molecules of ATP. 7.3 + 7.3= 14.6. So the answer is D
5. It’s B. The substrate won’t fit into the active site if you change the 3d structure of the enzyme. It is possible that maybe a different one would start to fit, but the main issue is that the original substrate won’t fit.
6. You’re right, the answer is D. It’s called the chemiosmotic potential, and it has to do with the proton concentration across the membrane.
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David asks…
Ap Bio Help! 10 points to best answer!!?
Which of the following statements best describe the second law of thermodynamics?
a. The energy that is released or absorbed during a chemical reaction when bonds are broken.
b. Energy can neither be created nor destroyed only changed from one from to another, the total energy remains constant.
c.If a process is spontaneous in one direction, then it can be spontaneous in the reverse direction.
d.Is energy that takes place when a compound is formed from its component pure element under standard state conditions.
Which of the following statements best expresses the process of dehydration synthesis where proteins form amino acids?
aThrough peptide bonds a chemical bond forms between two molecules.
b.As a polypeptide chain forms, they twist and bend forming a bond.
c.Polymers create an attraction between two molecules.
d.Through the formation of large macromolecules.
Which of the follow is not true of a exergonic reaction?
a.In an endergonic reaction the free energy of the initial state is lower than the free energy of the final state.
b.free energy is liberated during the reaction.
c.Enzymes increase the rates of exergonic reactions.
d.Exergonic refers to chemical reactions that proceed spontaneously from reactants to products with the release of energy.
Which of the following statements best describes what constitutes an essential amino acid?
a.These are the amino acids that are synthesized in the body.
b.Is characterized as being missing from the diet.
c.This amino acid must be provided in the diet.
d.The amino acids responsible for the equilibrium of your central nervous system.
The energy for all forms of muscle contraction is provided by…
a.ADP
b.Phosphocreatine
c.oxidative phosphorylation
d.generated in the mitochondria of the cell
e.ATP
Which of the following statements best characterize what takes place in a chemical reaction when energy is released?
a.catabolic reactions
b.exergonic reactions
c.exchange reactions
d.anabolic reactions
Which of these statements are NOT true of the consequences of the second law of thermodynamics?
a.Reactions which produce more stable molecules can happen spontaneously.
b.The cell can achieve 100% efficiency in using or storing energy only by using an enzyme.
c.Pushing a car uphill requires input of energy.
d.If the sun went out, all life on earth would cease.
Which of the following best characterizes the first law of thermodynamics?
a.The entropy of the universe is decreasing.
b.The entropy of the universe is constant.
c.Energy cannot be created or destroyed.
d.Energy cannot be transferred or transformed.
e.Kinetic energy is stored energy that results from the specific arrangement of matter.
The second law of thermodynamics says that in any isolated system things move from a less probable to a more probable state. Which of the following is inconsistent with this law?
a.the equalizing of the concentration of some substance on the two sides of a partition, which allows passage of the substance.
b.the persistence of a difference in concentration of some substance on the two sides of a partition, which doesn’t allow passage of the substance.
c.the existence of improbable assemblies of atoms, molecules, cells, and organisms, which constitute life.
d.None of the above
The average human male uses about 8,000 grams of ATP per hour. However, the body has on hand only 50 grams at any given time. Where is the additional ATP supplied?
a.some cells use more ATP than other cells.
b.ATP is recycled by constant regeneration from ADP.
c.some organs use more ATP than other organs.
d.more ATP is broken down than synthesized.
admin answers:
>> d.Is energy that takes place when a compound is formed from its component pure element under standard state conditions.
>> a.Through peptide bonds a chemical bond forms between two molecules.
>> a.In an endergonic reaction the free energy of the initial state is lower than the free energy of the final state.
>> a.These are the amino acids that are synthesized in the body.
>> e.ATP
>> b.exergonic reactions
>> b.The cell can achieve 100% efficiency in using or storing energy only by using an enzyme.
>> c.Energy cannot be created or destroyed.
>> a.the equalizing of the concentration of some substance on the two sides of a partition, which allows passage of the substance.
>> b.ATP is recycled by constant regeneration from ADP.
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