Which of the following is NOT true of human
chromosomes?
a. The haploid number is 23.
b. The diploid number is 46.
c. There are 23 pairs of chromosomes.
d. Human gametes end up with two of each
type of 23 chromosomes.
e. Human gametes end up with one of each
type of 23 chromosomes
D
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You are injecting a dye into a eukaryotic cell to detect a specific functional enzyme in the cytosol. Where would you need to inject the dye?
A. You would have to inject the dye into the membrane of the rough ER. B. The dye would go between the plasma membrane and membrane of the organelles. C. Injection of the dye must occur in the inner membrane space of the mitochondria. D. The Golgi apparatus holds the cytosol, and therefore the dye must be injected there.
Experiments on selective adhesion demonstrated
a. ectoderm cells have positive affinity for mesoderm cells but negative affinity for endoderm cells d. ectoderm cells have positive affinity for both endoderm and mesoderm cells b. ectoderm cells have negative affinity for mesoderm cells but positive affinity for endoderm cells e. endoderm cells have positive affinity for both ectoderm and mesoderm cells c. endoderm cells have positive affinity for mesoderm cells but negative affinity for ectoderm cells
If a cell is permeable to a solute, that solute will diffuse either into or out of the cell depending on the direction of its concentration gradient
a. True b. False
A population of 15 birds inhabits a small island. Ten of the birds are dark brown, and five of them are light brown. By chance, two of the dark brown birds and three of the light brown birds die before producing any offspring. All of the birds in the next generation are dark brown. This change in phenotypic frequency can be attributed to __________.
a. natural selection b. gene flow c. sexual selection d. genetic drift