In prophase, ribosomal RNA synthesis stops when the chromosomes condense, and as a result
A. the nucleolus disappears.
B. the chromosomes line up at the equator of the cell.
C. the nuclear envelope reforms.
D. the chromosomes lengthen.
Answer: A
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Cone cells most likely evolved from:
A. rhodopsin B. retinal C. rod cells D. ommatidia
If a gene has multiple alleles, ____
a. only two alleles of the gene exist in the population b. more than two alleles of the gene are present in any given individual c. more than two alleles of the gene are present in the population d. one or more of the alleles is epistatic to the other(s) e. the alleles must be incompletely dominant
What purpose do restriction enzymes play in bacterial cells?
a. Restriction enzymes prevent the overproduction of mRNA in the bacterial cell. b. Restriction enzymes attack bacteriophage DNA when it enters the cell. c. Restriction enzymes promote bonding of the RNA polymerase to the promoter. d. Restriction enzymes limit the rate of bacterial replication. e. Restriction enzymes connect Okazaki fragments.
Who were the first hominins thought to wear clothing, build fires, and live in caves or shelters?
a. Homo habilis b. Homo sapiens c. Homo erectus
d. Homo eragaster e. Homo neanderthalensis