All of the following statements about mycoplasmas are true EXCEPT
a. they possess a nucleoid.
b. they lack a cell wall.
c. they are Bacteria.
d. they are Archaea.
e. they are resistant to penicillin.
D
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You are given an embryo with eight cells and you carefully separate them and allow them to develop in separate containers. Each of the cells forms a complete embryo that develops normally into an adult animal. How would you categorize your animal?
A. It has indeterminate cleavage. B. It has determinate cleavage. C. It is a protostome. D. It is an annelid, mollusk, or arthropod. E. It has spiral cleavage.
Phenylketonuria is an inherited disease caused by a recessive autosomal allele. If a woman and her husband are both carriers, what is the probability that their first child will be a phenotypically normal girl?
A) 1/4 B) 1/16 C) 3/16 D) 3/8
Field observation suggests that populations of a particular species of herbivorous mammal undergo cyclic fluctuations in density at three- to five-year intervals. Which of the following represent (a) plausible explanation(s) of these cycles?
A) Periodic crowding affects the endocrine system, resulting in increased aggressiveness. B) Increases in population density lead to increased rates of predation. C) Increases in rates of herbivory lead to changes in the nutritive value of plants used as food. D) Increases in population density lead to more proximal infestations of parasites to host animals. E) All of the above are plausible explanations of population cycling.
Which microbe is most likely to survive the grilling during your spring break vacation?
a. gram + streptococcus b. gram - e coli c. bacillus endospore d. human immunodeficiency virus