The random changes in gene pool from one generation to the next is termed what?
a. gene flow
b. genetic drift
c. mutations
d. natural selection
b. genetic drift
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All of the following statements about a blastocyst are true EXCEPT
a. develops about 5 days after fertilization. b. still surrounded by the zona pellucida. c. comprised of blastomeres reorganized around the blastocyst cavity. d. still about the size of the original zygote. e. organized as embryoblast and trophoblast.
Like the insects, the arachnids (spiders and so on) have
(a) three pairs of walking legs. (b) one pair of antennae. (c) true mandibles. (d) an abdomen.
What information cannot be determined from the DNA sequence of a cDNA clone?
A) exon sequences B) sequence of the promoter C) similarity to previously identified sequences D) amino acid sequence of the encoded polypeptides E) sequence of the spliced mRNA transcript
A man is brought to the hospital suffering from nausea, vomiting, and severe stomach cramps. He had recently returned from a hiking trip in northern Minnesota
A sample taken from the man shows a single-celled flagellate organism that lacks mitochondria but has two nuclei. This organism is a(n) A) excavate. B) apicomplexan. C) diatom. D) euglenozoan. E) green alga.