Which of the following transmembrane transport mechanisms requires the expenditure of energy?
A) channel
B) antiporter
C) facilitated diffusion
D) aquaporin
Answer: B
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Sexual reproduction results in an increase in genetic diversity because:
A. during prophase I, genes that are paternally and maternally derived are recombined on the chromosomes so that the gametes have chromosomes that are different from the parents' chromosomes. B. during metaphase I, the bivalents line up in a random orientation so that gametes inherit a random set of maternally and paternally derived chromosomes. C. during fertilization, the gametes that fuse are random so that a large number of chromosomal combinations are possible in the new organism. D. of both recombination during prophase I and random orientation of bivalents during metaphase I. E. All of these choices are correct.
Gene transcription is induced by
a. A. b. B. c. C. d. D. e. none of these
The most common cause of low sperm count in males is _____
a. varicocele b. undescended testicles
c. testicular failure d. semen disorders e. obstructions
Cloning for the specific purpose of treating human disease is referred to as ________ cloning
Fill in the blank(s) with correct word