This does NOT apply to Hydrogen bond
A. it involves in formation of beta sheet structure
B. It involves sharing electron between molecules
C. it plays a major role in integrity of alpha-helix
D. it plays a major role in formation of double helix structure
E. It is required for formation of tertiary structure
Ans: B. It involves sharing electron between molecules
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The S cyclin-CDK complex:
A. controls the cell cycle during the S and G2 phases. B. triggers initiation of DNA synthesis during the S phase. C. prevents initiation of DNA synthesis a second time during the S and G2 phases. D. both controls the cell cycle during the S and G2 phases, and triggers initiation of DNA synthesis during the S phase. E. All of these choices are correct.
The chemiosmotic model of ATP synthesis is based on each of the following lines of experimental evidence except
A) Artificial proton gradients established by addition of acid can drive ATP synthesis in the absence of electron transport. B) Oxidative phosphorylation does not require a membrane-enclosed compartment. C) Electron transport causes protons to be pumped out of the mitochondrial matrix. D) The proton gradient established by electron transport has enough energy to drive ATP synthesis. E) Uncoupling agents abolish both the proton gradient and ATP synthesis.
Which of the following proteins attaches a crawling cell to the substrate in a focal adhesion?
A) actin B) myosins C) ?-actinin D) integrin E) titin
Suppose that a genetics researcher concludes that the probability of obtaining a double dominant phenotype in an F2 cross is 9/16. This conclusion can be valid only if one or more assumptions are true. Which of the following is a necessary assumption?
A: Alleles have an equal probability of separating into gametes. B: The two genes assort independently. C: The sample size is small. D: Both a and b E: Both b and c