Kristian Soto
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Biology (Final Exam ) Quiz on exam 2, created by Kristian Soto on 08/05/2017.

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Abby Felchak
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Kristian Soto
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exam 2

Question 1 of 28

1

Testosterone, a lipid-soluble signaling molecule, crosses the membranes of cells throughout the body but affects only target cells because __________.

Select one of the following:

  • only in target cells is testosterone able to initiate the phosphorylation cascade leading to activated transcription factor

  • only target cells possess the cytosolic enzymes that transduce signals

  • intracellular receptors for testosterone are present only in target cells

  • only target cells retain the appropriate DNA segments

Explanation

Question 2 of 28

1

Chlorophyll molecules are in which part of the chloroplast?

Select one of the following:

  • Thylakoid membranes

  • stroma

  • thylakoid space

  • plasma membrane

Explanation

Question 3 of 28

1

the concentration of solutes in a particular cell is about 2%, but the cell contains almost no sucrose or urea. Sucrose cannot pass through the membrane of this cell, but water and urea can. Osmosis would cause this cell to shrink the most when immersed in which of the following solutions?

Select one of the following:

  • a hypotonic sucrose solution

  • a hypertonic sucrose solution

  • hypertonic urea solution

  • hypotonic urea solution

Explanation

Question 4 of 28

1

starting with one molecule of glucose, the energy containing products of glycolysis are:

Select one of the following:

  • 2 NAD+, 2 pyruvate, and 2 ATP

  • 2 NADH, 2 pyruvate, and 2 ATP

  • 2 FADH2, 2 pyruvate, and 4 ATP

Explanation

Question 5 of 28

1

in the absence of oxygen, cells need a way to regenerate which compound following glycolysis?

Select one of the following:

  • NAD+

  • ethanol

  • carbon dioxide

Explanation

Question 6 of 28

1

Molecular oxygen (O2) has what role in aerobic cellular respiration?

Select one of the following:

  • it oxidizes pyruvate at the end of glycolysis

  • it removes a carbon only from pyruvate, producing CO2

  • it is the final electron acceptor at the end of the electron transport chain

  • it is the source of oxygen in all of the CO2 molecules produced during cellular respiration

Explanation

Question 7 of 28

1

Which of the following determines the sign of DELTA G for a reaction?

Select one of the following:

  • the free energy of the reactants and the free energy of the products

  • the affinity of the enzyme for the reactants

  • the enzyme concentration

  • the free energy of the products

  • the free energy of the reactants

Explanation

Question 8 of 28

1

which of the following is a correct description and sequence of events in cellular respiration?

Select one of the following:

  • oxidation of glucose to pyruvate; reduction of pyruvate; TCA cycle; oxidative phosphorylation

  • Glycolysis; education of pyruvate; TCA cycle; oxidative phosphorylation

  • glycolysis; oxidative phosphorylation; TCA cycles; oxidation of pyruvate

  • oxidation of glucose to pyruvate; oxidation of pyruvate; oxidation of acetyl-coA; oxidative phosphorylation

Explanation

Question 9 of 28

1

how does carbon dioxide enter the leaf?

Select one of the following:

  • stomata

  • chloroplasts

  • roots

  • thylakoids

Explanation

Question 10 of 28

1

how does a noncompetitive inhibitor decrease the rate on an enzyme reaction

Select one of the following:

  • by binding at the active site of the enzyme

  • by changing the shape of the enzyme's active site

  • by decreasing the activation energy of the reaction

  • by changing the free-energy charge of the reaction

Explanation

Question 11 of 28

1

which of the following is true for anabolic pathways

Select one of the following:

  • they do not depend on enzymes

  • they are usually highly spontaneous chemical reactions

  • they consume energy to decrease the entropy of the organism and its environment

  • the consume energy to build up polymers from monomers

Explanation

Question 12 of 28

1

enzyme activity is affected by pH because

Select one of the following:

  • most substrates don't function well at high or low pH

  • high or low pH may disrupt hydrogen bonding or ionic interactions and thus change the shape of the enzyme's active site

  • the binding of hydrogen ions to the enzyme absorbs energy and thus there may not be enough energy to overcome the activation energy barrier

  • changes in pH will cause loss of all cofactors from enzymes

Explanation

Question 13 of 28

1

when oxygen is released as a result of photosynthesis, it is a direct by-product of

Select one of the following:

  • the electron transfer system of photosystem I

  • the electron transfer system of photosystem II

  • splitting water molecules

  • chemiosomosis

Explanation

Question 14 of 28

1

approximately how many molecules of ATP are produced from the complete oxidation of one molecule of glucose in aerobic cellular respiration

Select one of the following:

  • 2

  • 4

  • 18

  • 30-34

  • 60-68

Explanation

Question 15 of 28

1

if muscle cells in the human body consume O2 faster than it can be supplied, which of the following is likely to result?

Select one of the following:

  • the muscle cells will have trouble making enough ATP to meet demands

  • the cells will not be able to carry out oxidative phosphorylation

  • the cells will consume glucose at an increased rate

  • the muscle cells will have trouble making enough ATP to meet demands and the cells will not be able to carry out oxidative phosphorylation

  • all of the listed events will occur

Explanation

Question 16 of 28

1

which of the following molecules is most likely to passively diffuse across the plasma membrane?

Select one of the following:

  • glucose

  • DNA

  • hemoglobin

  • carbon dioxide

Explanation

Question 17 of 28

1

when chemical, transport, or mechanical work is done by an organism, what happens to the heat generated?

Select one of the following:

  • it is used to power yet more cellular work

  • it is used to store energy as more ATP

  • it is transported to specific organs such as the brain

  • it is lost to the environment

Explanation

Question 18 of 28

1

where do the reactions of the citric acid cycle occur in eukaryotic cells?

Select one of the following:

  • the matrix of the mitochondrion

  • the cytosol

  • the crustal of the mitochondrion

  • the inter membrane space of the mitochondrion

Explanation

Question 19 of 28

1

most cells cannot harness heat to perform work because

Select one of the following:

  • heat is not a form of energy

  • cells do not have much heat; they are relatively cool

  • heat can never be used to do work

  • temperature is usually uniform throughout a cell

Explanation

Question 20 of 28

1

which of the following pairs correctly matches a membrane transport process to its primary function?

Select one of the following:

  • pinocytosis; the uptake of water and small solutes into the cell by formation of vesicles at the plasma membrane

  • phagocytosis; recreation of large particles from the cell by fusion of vesicles with the plasma membrane

  • exocytosis; the movement of water and solutes out of the cell by vesicle fusion with the plasma membrane

  • osmosis; passive diffusion of water and small solutes across a membrane

Explanation

Question 21 of 28

1

in general, the hydrolysis of ATP drives cellular work by __________.

Select one of the following:

  • releasing free energy that can be coupled to other reactions

  • yielding free phosphate

  • releasing heat

  • acting as a a catalyst

  • lowering the free energy of the reaction

Explanation

Question 22 of 28

1

some bacteria are metabolically active in hot springs because __________.

Select one of the following:

  • they are able to maintain lower internal temperature

  • high temperatures make catalysis unnecessary

  • their enzymes are completely insensitive to temperate

  • their enzymes have high optimal temperatures

  • they use molecules other than proteins or RNAs as their main catalysts

Explanation

Question 23 of 28

1

in the absence of oxygen, yeast cells can obtain energy by fermentation, resulting in the production of

Select one of the following:

  • ATP, CO2, and lactate

  • ATP, CO2, and ethanol (ethyl alcohol)

  • ATP, NADH, and pyruvate

  • ATP, pyruvate, and oxygen

Explanation

Question 24 of 28

1

Which of the following statements describes NAD+?

Select one of the following:

  • It has more chemical energy than NADH

  • it is oxidized by the action of hydrogenases

  • it is reduced to NADH during glycolysis, pyruvate oxidation, and the citric acid cycle

  • it can donate electrons for use in oxidative phosphorylation

  • in the absence of NAD+, glycolysis can still function

Explanation

Question 25 of 28

1

the electron transport chain involved in cellular respiration is located in/on the ________.

Select one of the following:

  • inner membrane of the mitochondrion

  • cytosol

  • matrix of the mitochondrion

  • inter membrane space of the mitochondrion

  • non of the listed responses is corrected

Explanation

Question 26 of 28

1

which of the following does not occur during the calvin cycle?

Select one of the following:

  • release of oxygen

  • carbon fixation

  • oxidation of NADPH

  • regeneration of the CO2 acceptor

  • consumption of ATP

Explanation

Question 27 of 28

1

rubisco is ________.

Select one of the following:

  • the enzyme in C3 plants that first captures CO2 to begin the Calvin Cycle

  • the enzyme responsible for splitting H2O to produce O2 in photosynthesis

  • the enzyme that forms a 4-carbon compound in CAM photosynthesis

  • the 5 carbon sugar molecule that reacts with CO2 to begin the Calvin cycle

Explanation

Question 28 of 28

1

Do i need to study the matching that is on Test 2?

Select one or more of the following:

  • YES!!!!

  • no

Explanation

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