Section 1
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Which of the following factors would tend to increase membrane fluidity? A. A greater proportion of unsaturated phospholipids B. A greater proportion of saturated phospholipids C. A lower temperature D. A relatively high protein content in the membrane
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Section 1
(50 cards)
Which of the following factors would tend to increase membrane fluidity? A. A greater proportion of unsaturated phospholipids B. A greater proportion of saturated phospholipids C. A lower temperature D. A relatively high protein content in the membrane
A) A greater proportion of unsaturated phospholipids
Which cell would be best for studying lysosomes?
D) phagocytic white blood cell
Enzymes that break down DNA catalyze the hydroplysis of the covalent bonds that join nucleotides together. What would happen to DNA molecules treated with these enzymes?
B) The phosphodiester linkages of the polynucleotide backbone would be broken
Which of the following is true of unsaturated fats? A. They are more common in animals than in plants B. They have double bonds in their fatty acid chains. C. They generally solidify at room temperature D. They contain more hydrogen than do saturated fats having the same number of carbon atoms
B) They have double bonds in their fatty acid chains.
Which metabolic pathway is common to both fermentation and cellular respiration of a glucose molecule?
C. Glycolysis
A slice of pizza has 500kcal. If we could burn the pizza and use all the heat ot warm a 50-L container of cold water, what would be the approximate increase in the temperature of the water? Note a liter of cold water weighs about 1KG.
D) 10 degrees celsius
The reactivity of an atom arises from
B) the existence of unpaired electrons in the valence shell.
All the organisms on your campus make up A) an ecosystem. B) a community. C) a population. D) a taxonomic domain.
B. A community
According to the fluid mosaic model of membrane structure, proteins of the membrane are mostly
C) Embedded in a lipid bilayer
Which of the following is present in a prokaryotic cell? A. Mitochondrian B. Ribosome C. Nuclear envelope D. Chloroplast
B) Ribosome
Which statement is true of all atoms that are anions? A. The atom has more electrons than protons B. The atom has more protons than electrons C. The atom has fewer protons than does a neutral atom of the same element D. The atom has more neutrons than protons.
A) The atom has more electrons than protons
Which of the following statements best distinguishes hypotheses from theories in science? A)Theories are hypotheses that have been proved B)Hypotheses are guess; theories are correct answer. C)Hypotheses are relatively narrow in scopes; theories have broad explanatory power D) Theories are provided true; hypotheses are often contradicted by experimental results
C) Hypotheses are relatively narrow in scopes; theories have broad explanatory power
The molecular formula for glucose is C6H12O6. What would be the molecular formula for a polymer made by linking ten glucose molecules together by dehydration reactions?
B) C60 H102 O51
Which of the following statements correctly describes any chemical reaction that has reached equilibrium? A. The concentrations of products and reactants are equal B The reaction is now irreversible C. Both forward and reverse reactions have halted D. The rates of the forward and reverse reactions are equal
D) The rates of the forward and reverse reactions are equal
The enzyme amylase can break glycosidic linkages between glucose monomers only if the monomers are in the a form. Which of the following could amylase break down? A. Glycogen, starch, and amylopectin B. Glycogen and cellulose C. Cellulose and chitin D. Starch, chitin, and cellulose
A) Glycogen, starch, and amylopectin
We can be sure that a mole of table sugar and a mole of vitamin C are equal in their?
D) Number of molecules
In mitochondria, exergonic redox reactions
B. provide the energy that establishes the protein gradient
If an enzyme in solution is saturated with substrate, the most effective way to obtain a faster yield of products is to
A. add more of the enzyme
Choose the pair of terms that correctly completes this sentence: Catabolism is to anabolism as _______ is to _______. A. Exergonic; spontaneous B. Exergonic; energonic C. Free energy; entropy D. work; energy
B. Exergonic; energonic
Which of the following metabolic process can occur w/o a net influx of energy from some other process?
B. C6 H12 O6 + 6 O2 -> 6 CO2 + 6 H2O
Which structure is common to plant and animal cells? A. Chloroplast B. Central vacuole C. Mitochondrion D. Centriole
C) Mitochondrion
In the term trace element, the adjective trace means that
A) The element is required in very small amounts
Which of the following categories includes all others in the list? A. Disaccharide B. Polysaccharide C. Starch D. Carbohydrate
D) Carbohydrate
Some bacteria are metabolically active in hot springs because
C. their enzymes have high optimal temperatures
What coefficients must be placed in the following blanks so that all atoms are accounted for in the products? C6H12O6 → _____ C2H6O + _____ CO2 a. 2; 1 b. 3; 1 c. 1; 3 d. 2; 2
D) 2; 2
What is the hydroxide ion concentration of the lake described in the previous question?
A) 10-10 M
Systems biology is mainly an attempt to
c. understand the behavior of entire biological systems by studying interactions among its component parts
Which sentence best describes the logic of scientific inquiry? A)If I generate a testable hypothesis, tests and observations will support it. B)If my prediction is correct, it will lead to a testable hypothesis C)If my observations are accurate, they will support my hypothesis D)If my hypothesis is correct, I can expect certain test results
D) If my hypothesis is correct, I can expect certain test results
Most CO2 from catabolism is released during
B) the citric acid cycle.
Measurements show that the pH of a particular lake is 4.0. What is the hydrogen ion concentration of the lake?
C) 10-4 M
Which of the following is an example of qualitative data? A)The fish swam in a zigzag motion B)The contents of the stomach are mixed every 20 seconds C)The temperature decrease from 20C to 15C D)The six pairs of robins hatched an average of 3 chicks each
A) The fish swam in a zigzag motion
CHAPTER 10: The light reactions of photosynthesis supply the Calvin cycle with
D. ATP and NADPH
Which of the following best demonstrates the unity among all organisms? A) Emergent properties B)Descent with modification C)The structure and function of DNA D)Natural selection
C. the structure and function of DNA
Compared with 31P, the radioactive isotope 32P has A) A different atomic number B)One more proton C)One more electron D)One more neutron
D) One more neutron
We can represent atoms by listing the number of protons, neutrons, and electrons-for example, 2P+, 2NO, 2E- for helium. Which of the following represents the 18O isotope of oxygen? A. 7P+, 2N0, 9E- B. 8P+, 10N0, 8E- C. 9P+, 9N0, 9E- D. 10P, 8N0, 9E-
B) 8P+, 10N0, 8E-
Cyanide binds to at least one molecule involved in producing ATP. If a cell is exposed to cyanide, most of the cyanide will be found within the
A) Mitochondria
Which of the following is a hydrophobic material? A. Paper B. Wax C. Table salt D. Sugar
C) Table Salt
The final electron acceptor of the electron transport chain that functions in aerobic oxidative phosphorylation is
A. oxygen
Based on Figure 7.18 in your textbook, which of these experimental treatments would increase the rate of sucrose transport into the cell? A) decreasing extracellular sucrose concentration B) decreasing extracellular pH C) decreasing cytoplasmic pH D) adding a substance that makes the membrane more permeable to hydrogen ions
B) Decreasing extracellular pH
Which of the following processes includes all the others? A. Osmosis B. Diffusion of a solute across a membrane C. Passive transport D. Transport of an ion down its electrochemical gradient
C) Passive transport
CHAPTER 9: The immediate energy source that drives ATP synthesis by ATP synthase during oxidative phosphorylation is the
C. H+ concentration gradient across the membrane holding ATP synthase.
When electrons flow along the electron transport chains of mitochondria, which of the following changes occurs?
A. the PH of the matrix increases
A controlled experiment is one that
B) tests experimental and control groups in parallel.
What is the oxidizing agent in the following reaction? Pyruvate + NADH + H+ -> Lactate + NAD+
D. pyruvate
In what way do the membranes of a eukaryotic cell vary?
B) Certain proteins are unique to each membrane
Which structure is not part of the endomembrane system? A. nuclear envelope B. Chloroplast C. Golgi apparatus D. Plasma membrane
B) Chloroplast
If an enzyme is added to a solution where its substrate and product are in equilibrium, what will occur?
D. nothing; the reaction will stay at equilibrium
The atomic number of sulfur is 16. Sulfur combines with hydrogen by covalent bonding to form a compound, hydrogen sulfide. Based on the number of valence electrons in a sulfur atom, predict the molecular formula of the compound. A.HS B. HS2 C. H2S D. H4S
C) H2S
The structural level of a protein least affected by a disruption in hydrogen bonding is the _______ level
A) Primary level
Most cells cannot harness heat to perform work because
C. temperature is usually uniform throughout a cell
Section 2
(31 cards)