The prokaryotic transport system that involves a substrate-binding protein, a membrane-integrated transporter, and an ATP-hydrolyzing protein is
A) the ABC transport system.
B) group translocation.
C) symport.
D) simple transport.
Answer: A
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In fruit flies, brown eyes can be caused by recessive mutant alleles of any one of three genes: pn (prune), bw (brown) or ry (rosy). The pn gene is X-linked, bw is on the second chromosome, and ry is on the third chromosome. One wild-type allele of each of the three genes must be present for eyes to be red (wild type). Suppose that two brown-eyed flies are crossed and their progeny consist of brown-eyed sons and red-eyed daughters. Which mutation is responsible for the brown eyes in the parental female?
A) pn B) bw C) ry D) either bw or ry E) any of the three—pn, bw, or ry
Which of the following is a physiological mechanism used by endotherms to dissipate heat?
a. basking b. contact with hot surfaces, such as rocks c. vasodilation d. group activities that generate heat
The letter "A" in the above figure represents
a. keratin-filled, dead epithelial cells. b. replicating epithelium. c. mucus produced by underlying ciliated cells. d. white blood cells attacking a bacterial cell. e. all of these
Which of the following is a unique feature of viruses that separates them from bacteria?
A. They lack proteins. B. They are generally smaller. C. They have different nucleotides in their hereditary material. D. They cannot exist outside of a host cell. E. They are often highly toxic.