The____layer of the digestive tract in mammals is in direct contact with the lumen
a. mucosa
b. muscularis
c. submucosa
d. serosa
e. serosa and muscularis
ANSWER: a
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The female genetic ancestor of all living humans:
A. lived in Africa only 10,000 years ago. B. was the only living female of her tribe. C. was identified using haplotypes on the X chromosome. D. was the only female of her tribe to have children. E. was the only female whose mitochondrial DNA has been inherited in the modern human lineage.
Which of the following is not characteristic of ciliates?
a. They use cilia as locomotory structures or as feeding structures. b. They are relatively complex cells. c. They can exchange genetic material with other ciliates by the process of mitosis. d. Most live as solitary cells in fresh water. e. They have two or more nuclei.
Bacteria that are unable to survive in the presence of oxygen are called
A) obligate anaerobes. B) obligate aerobes. C) facultative anaerobes.
Which of the examples below are polymorphic traits? Select all that apply.
A. Lactose tolerance and intolerance in humans. B. A population of lilies that contains equal proportions of both blue and white flowering individuals. C. The A, B, and O blood types found in humans. D. Hair loss in malnourished, captive chimpanzees. E. The change from white coat in winter to brown coat in summer in Arctic fox populations.