The two copies of each type of chromosome found in normal somatic (body) cells in an organism, throughout the cell cycle, are called:
A. Homologous chromosomes
B. Daughter chromosomes
C. Kinetochores
D. Sister chromatids
Answer: A
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A muscle that decreases the angle between two bones at a joint is called a(n)
a. flexor. b. agonist. c. depressor. d. antagonist. e. extensor.
The region of DNA where RNA synthesis begins is the ________
A) start codon B) promoter C) stop codon D) terminator
Within a large population, if no mutations occur, no migration occurs, all matings are random, and each individual has an equal chance of reproducing, which of the following will probably happen?
A) No evolution will occur. B) Natural selection will occur at the normal rate for that species. C) A change in allele frequency will lead to rapid evolution. D) Extinction will result. E) A bottleneck will occur.
During the termination stage ___________.
A. a start codon enters the ribosome B. release factors separate the ribosomal subunits C. mRNA attaches to the ribosome and the polypeptide chain D. ribosomal subunits join E. a stop codon enters the ribosome