Exam II F'02 (1710)

Exam II F'02 (1710) - Principles of Biology Exam II Fall...

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Principles of Biology Exam II, Fall 2002 Read each question clearly and all of the possible answers. Then choose the BEST answer Name:_______________________ Signature:_____________________ 1. During which phase of meiosis are the tetrads of homologous chromosomes aligned at the center of the dividing cell? a. prophase I b. metaphase I c. anaphase II d. anaphase I e. metaphase II 2. NAD is an example of a/an: a. electron donor. b. oxidizing compound. c. a second messenger. d. electron acceptor. e. a growth factor. 3. The pigment molecule at the reaction center of photosystem I is: a. chlorophyll a. b. chlorophyll b. c. a carotenoids. d. either chlorophyll a or chlorophyll b, but never a carotenoid. e. either chlorophyll a, chlorophyll b, or a carotenoid. 4. For an endergonic reaction,: a. the activation energy is always very high. b. the reaction is favored from a thermodynamic standpoint. c. the free energy of the products is low. d. the change in free energy (dG) is positive. e. life is just an up hill battle. 5. A final product of a metabolic pathway inhibits an early enzyme in the pathway by binding to it and inducing a conformational change. This is an example of: a. competitive inhibition. b. allosteric regulation. c. cooperativity. d. reaction coupling. e. enzymatic flexibility. 6. Which of the following is/are NOT involved in intracellular signaling cascades? a. cAMP b. adenylate cyclase c. G proteins d. calcium ions e. All of the above are involved in intracellular signaling cascades
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7. Protein catalyzed reactions move forward more readily than uncatalyzed reactions because: a. the DG has been increased. b. the DG has been decreased. c. entropy has been increased. d. the required activation energy has been decreased. e. entropy has been decreased. 8. The basic building block of chromatin structure which repeats every 200 base pair of DNA is the: a. karyotype. b. chromatid. c. nucleosome. d. heterochromatin. e. euchromatin. 9. The highly condensed regions of DNA in the non-replicating nucleus which contain few if any expressed genes are called: a. karyotypes. b. chromatids. c. nucleosomes. d. heterochromatin. e. euchromatin. 10. A cell is said to be 2n. This means that: a. it has replicated its DNA. b. it is haploid. c. it is diploid. d. the chromosomes have not yet split at the centromeres. e.
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Exam II F'02 (1710) - Principles of Biology Exam II Fall...

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