Zhang and Cech’s experiments confirmed which feature of ribozyme activity?
a. Ribozymes inhibit rates of biological reactions.
b. Ribozymes catalyze formation of bonds between amino acids in protein synthesis.
c. Ribozymes catalyze formation of the fundamental linkage tying nucleic acids to proteins.
d. Ribozymes can link nucleic acids together even if their proteins are removed.
e. Ribozymes provide a possible solution to the question of whether proteins or nucleic acids appeared first in
evolution.
ANSWER: b
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The function of carbonic anhydrase is to increase the rate ____
a. of conversion of CO2 and H2O into HCO3? and H+ b. of conversion of HCO3? and H+ into CO2 and H2O c. at which CO2 binds to hemoglobin d. at which O2 binds to hemoglobin e. of conversion of HCO3? and H+ into CO2 and H2O, and the rate at which CO2 binds to hemoglobin
An action potential results from the
a. opening of voltage-gated channels. b. closing of voltage-gated channels. c. ionization of voltage-gated channels. d. opening and closing of voltage-gated channels. e. opening and ionization of voltage-gated channels
Cancer is associated with problems related to the regulation of ________
A) meiosis II B) mitosis C) meiosis I D) cytokinesis
Cell movement involves the coordination of many events in the cell. Which of the following phenomena is not required for cell motility?
(a) Myosin-mediated contraction at the rear of the moving cell. (b) Integrin association with the extracellular environment. (c) Nucleation of new actin filaments. (d) Release of Ca2+ from the sarcoplasmic reticulum.