From a sociobiological perspective, altruism is a behavior that
A) does not have a genetic basis.
B) can potentially enhance the altruist's fitness.
C) will always be selected against.
D) occurs only in the social insects.
Answer: B
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In a lichen, the fungal partner
A. provides a substratum within which the alga grows. B. provides water and minerals to the alga. C. protects the alga from excess light intensities. D. All of the choices are correct.
Invertebrates
a. do not have a vertebral column. b. have a vertebral column. c. are all members of the phylum Chordata. d. do not include animals that are members of the phylum Chordata.
Which of the lakes in the accompanying figure may experience turnover?
a. 2 and 4
b. 2 and 3
c. 3 and 4
d. 1 and 2
e. 1 and 3
Which of the following would most likely interact by forming an ionic bond?
A.) the enzyme hexokinase and its substrate glucose B.) ATP and magnesium cations C.) two strands of DNA D.) fatty acid chain and inorganic phosphate E.) urea and water