Which of the following characteristics applies to both B and T cells?
a. mature in the bone marrow
b. can differentiate into memory cells
c. secrete proteins
d. participate in acquired immunity
e. involved in phagocytosis
E
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Elephants are not the most dominant species in African grasslands, yet they influence community structure
The grasslands contain scattered woody plants, but they are kept in check by the uprooting activities of the elephants. Take away the elephants, and the grasslands convert to forests or to shrublands. The newly growing forests support fewer species than the previous grasslands. Which of the following describes why elephants are the keystone species in this scenario? A) Elephants exhibit a disproportionate influence on the structure of the community relative to their abundance. B) Grazing animals depend upon the elephants to convert forests to grassland. C) Elephants prevent drought in African grasslands. D) Elephants are the biggest herbivore in this community. E) Elephants help other populations survive by keeping out many of the large African predators.
If you were using cladistics to construct a phylogenetic tree of birds, what is the best outgroup?
A. eastern bluebirds B. bats C. robins D. eagles
What is the difference between an aldose sugar and a ketose sugar?
A) the number of carbons B) the position of the hydroxyl groups C) the position of the carbonyl group D) One is a ring form, the other is a linear chain/
Accidents during meiosis that can result in trisomies and monosomies are called
a. nondisjunctions. b. inversions. c. reciprocal translocations. d. recombinations. e. acrocentricities.