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biology exam 2
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Questions in this quiz (28)
1Testosterone, a lipid-soluble signaling molecule, crosses the membranes of cells throughout the body but affects only target cells because __________.
- Aonly in target cells is testosterone able to initiate the phosphorylation cascade leading to activated transcription factor
- Bonly target cells possess the cytosolic enzymes that transduce signals
- Cintracellular receptors for testosterone are present only in target cells
- Donly target cells retain the appropriate DNA segments
2Chlorophyll molecules are in which part of the chloroplast?
- AThylakoid membranes
- Bstroma
- Cthylakoid space
- Dplasma membrane
3the 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?
- Aa hypotonic sucrose solution
- Ba hypertonic sucrose solution
- Chypertonic urea solution
- Dhypotonic urea solution
4starting with one molecule of glucose, the energy containing products of glycolysis are:
- A2 NAD+, 2 pyruvate, and 2 ATP
- B2 NADH, 2 pyruvate, and 2 ATP
- C2 FADH2, 2 pyruvate, and 4 ATP
5in the absence of oxygen, cells need a way to regenerate which compound following glycolysis?
- ANAD+
- Bethanol
- Ccarbon dioxide
6Molecular oxygen (O2) has what role in aerobic cellular respiration?
- Ait oxidizes pyruvate at the end of glycolysis
- Bit removes a carbon only from pyruvate, producing CO2
- Cit is the final electron acceptor at the end of the electron transport chain
- Dit is the source of oxygen in all of the CO2 molecules produced during cellular respiration
7Which of the following determines the sign of DELTA G for a reaction?
- Athe free energy of the reactants and the free energy of the products
- Bthe affinity of the enzyme for the reactants
- Cthe enzyme concentration
- Dthe free energy of the products
- Ethe free energy of the reactants
8which of the following is a correct description and sequence of events in cellular respiration?
- Aoxidation of glucose to pyruvate; reduction of pyruvate; TCA cycle; oxidative phosphorylation
- BGlycolysis; education of pyruvate; TCA cycle; oxidative phosphorylation
- Cglycolysis; oxidative phosphorylation; TCA cycles; oxidation of pyruvate
- Doxidation of glucose to pyruvate; oxidation of pyruvate; oxidation of acetyl-coA; oxidative phosphorylation
9how does carbon dioxide enter the leaf?
- Astomata
- Bchloroplasts
- Croots
- Dthylakoids
10how does a noncompetitive inhibitor decrease the rate on an enzyme reaction
- Aby binding at the active site of the enzyme
- Bby changing the shape of the enzyme's active site
- Cby decreasing the activation energy of the reaction
- Dby changing the free-energy charge of the reaction
11which of the following is true for anabolic pathways
- Athey do not depend on enzymes
- Bthey are usually highly spontaneous chemical reactions
- Cthey consume energy to decrease the entropy of the organism and its environment
- Dthe consume energy to build up polymers from monomers
12enzyme activity is affected by pH because
- Amost substrates don't function well at high or low pH
- Bhigh or low pH may disrupt hydrogen bonding or ionic interactions and thus change the shape of the enzyme's active site
- Cthe binding of hydrogen ions to the enzyme absorbs energy and thus there may not be enough energy to overcome the activation energy barrier
- Dchanges in pH will cause loss of all cofactors from enzymes
13when oxygen is released as a result of photosynthesis, it is a direct by-product of
- Athe electron transfer system of photosystem I
- Bthe electron transfer system of photosystem II
- Csplitting water molecules
- Dchemiosomosis
14approximately how many molecules of ATP are produced from the complete oxidation of one molecule of glucose in aerobic cellular respiration
- A2
- B4
- C18
- D30-34
- E60-68
15if muscle cells in the human body consume O2 faster than it can be supplied, which of the following is likely to result?
- Athe muscle cells will have trouble making enough ATP to meet demands
- Bthe cells will not be able to carry out oxidative phosphorylation
- Cthe cells will consume glucose at an increased rate
- Dthe muscle cells will have trouble making enough ATP to meet demands and the cells will not be able to carry out oxidative phosphorylation
- Eall of the listed events will occur
16which of the following molecules is most likely to passively diffuse across the plasma membrane?
- Aglucose
- BDNA
- Chemoglobin
- Dcarbon dioxide
17when chemical, transport, or mechanical work is done by an organism, what happens to the heat generated?
- Ait is used to power yet more cellular work
- Bit is used to store energy as more ATP
- Cit is transported to specific organs such as the brain
- Dit is lost to the environment
18where do the reactions of the citric acid cycle occur in eukaryotic cells?
- Athe matrix of the mitochondrion
- Bthe cytosol
- Cthe crustal of the mitochondrion
- Dthe inter membrane space of the mitochondrion
19most cells cannot harness heat to perform work because
- Aheat is not a form of energy
- Bcells do not have much heat; they are relatively cool
- Cheat can never be used to do work
- Dtemperature is usually uniform throughout a cell
20which of the following pairs correctly matches a membrane transport process to its primary function?
- Apinocytosis; the uptake of water and small solutes into the cell by formation of vesicles at the plasma membrane
- Bphagocytosis; recreation of large particles from the cell by fusion of vesicles with the plasma membrane
- Cexocytosis; the movement of water and solutes out of the cell by vesicle fusion with the plasma membrane
- Dosmosis; passive diffusion of water and small solutes across a membrane
21in general, the hydrolysis of ATP drives cellular work by __________.
- Areleasing free energy that can be coupled to other reactions
- Byielding free phosphate
- Creleasing heat
- Dacting as a a catalyst
- Elowering the free energy of the reaction
22some bacteria are metabolically active in hot springs because __________.
- Athey are able to maintain lower internal temperature
- Bhigh temperatures make catalysis unnecessary
- Ctheir enzymes are completely insensitive to temperate
- Dtheir enzymes have high optimal temperatures
- Ethey use molecules other than proteins or RNAs as their main catalysts
23in the absence of oxygen, yeast cells can obtain energy by fermentation, resulting in the production of
- AATP, CO2, and lactate
- BATP, CO2, and ethanol (ethyl alcohol)
- CATP, NADH, and pyruvate
- DATP, pyruvate, and oxygen
24Which of the following statements describes NAD+?
- AIt has more chemical energy than NADH
- Bit is oxidized by the action of hydrogenases
- Cit is reduced to NADH during glycolysis, pyruvate oxidation, and the citric acid cycle
- Dit can donate electrons for use in oxidative phosphorylation
- Ein the absence of NAD+, glycolysis can still function
25the electron transport chain involved in cellular respiration is located in/on the ________.
- Ainner membrane of the mitochondrion
- Bcytosol
- Cmatrix of the mitochondrion
- Dinter membrane space of the mitochondrion
- Enon of the listed responses is corrected
26which of the following does not occur during the calvin cycle?
- Arelease of oxygen
- Bcarbon fixation
- Coxidation of NADPH
- Dregeneration of the CO2 acceptor
- Econsumption of ATP
27rubisco is ________.
- Athe enzyme in C3 plants that first captures CO2 to begin the Calvin Cycle
- Bthe enzyme responsible for splitting H2O to produce O2 in photosynthesis
- Cthe enzyme that forms a 4-carbon compound in CAM photosynthesis
- Dthe 5 carbon sugar molecule that reacts with CO2 to begin the Calvin cycle
28Do i need to study the matching that is on Test 2?
- AYES!!!!
- Bno
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- Quiz on biology exam 2, created by Abby Felchak on 08/05/2017.
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- Abby Felchak
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