Sister chromatid exchanges increase in frequency in the presence of X-rays, certain viruses, ultraviolet light, and certain chemical mutagens. In what autosomal recessive disorder is there known to be an increase in sister chromatid exchanges?
A) Harlequin syndrome
B) cystic fibrosis
C) achondroplasia
D) Bloom syndrome
E) Huntington's disease
Answer: A
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Assume that some members of an aquatic species of motile, photosynthetic protists evolve to become parasitic to fish. They gain the ability to live in the fish gut, absorbing nutrients as the fish digests food
Over time, which of the following phenotypic changes would you expect to observe in this population of protists? A) loss of motility B) loss of chloroplasts C) gain of a rigid cell wall D) gain of meiosis E) No changes would be expected.
The organelle of plant cells that is analogous to the lysosome in animal cells is the
A) vacuole. B) triskelion. C) microsome. D) endosome. E) lysosome.
You observe a tissue with one free surface and several cell layers attached to a basal lamina. This is an example of
____.
a. connective tissue only b. epithelial tissue only c. muscle tissue only d. nervous tissue only e. connective and muscle tissue
Which of the following does NOT have an exoskeleton?
a. lobsters b. spiders c. insects d. earthworms e. centipedes