All of these statements are true of antigens except __________.
A) they often have a molecular weight of less than 10,000
B) they are often surface molecules on microbes
C) they are often proteins or polysaccharides
D) they can include nonmicrobial molecules, such as pollen, egg white, and blood cell surface molecules
E) they are typically nonself molecules
Ans: A) they often have a molecular weight of less than 10,000
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Trimming a shrub will make it become more bushy (have more lateral growth) primarily due to a reduction in the
amount of ____.
a. auxin b. ethylene c. abscisic acid d. gibberellin e. cytokinin
Altruistic behavior is
a. selfish. b. sexually directed behavior. c. self-sacrificing behavior. d. aggressive behavior. e. nonreactive, such as freezing at the sign of danger.
The endosperm of a plant
a. is the food supply for the new sporophyte plant. b. is composed of haploid tissue. c. protects the young embryo within a seed. d. provides a connection between the ovary of a flower and a developing seed. e. produces sperm cells.
Communities with low evenness will have rank-abundance curves
A) that are very steep. B) that are 1:1. C) that are very shallow. D) that are flat.