Which cluster of terms accurately reflects the nature of DNA replication in prokaryotes?
A) fixed point of initiation, bidirectional, conservative
B) random point of initiation, unidirectional, semiconservative
C) fixed point of initiation, bidirectional, semiconservative
D) fixed point of initiation, unidirectional, conservative
E) random point of initiation, bidirectional, semiconservative
Answer: C
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Signal amplification relies on:
A. increasing amounts of ligand as signal transduction proceeds. B. a sequential increase in the different components of the signal transduction pathway. C. increasing numbers of cell-surface receptors as the signal is transduced. D. increased activity of protein phosphatases.
Loud sounds cause temporary hearing loss due to damage to the:
a. eardrum b. auditory nerve c. cilia of the hair cells d. middle ear bones e. outer ear
In bacteriophage T4, all rIIA mutants are found to complement all rIIB mutants. However, rIIA mutants fail to complement other rIIA mutants, and rIIB mutants fail to complement other rIIB mutants
Furthermore, mutants with deletions that span both rIIA and rIIB complementation groups do not complement either A or B mutants. What do these data mean, and what do the complementation groups represent?
In controlled experiments:
a. all variables are independent of each other. b. all critical variables are manipulated. c. all variables are dependent on each other. d. one variable is manipulated while others are held constant. e. all variables are held constant.