Which of the following refers to the mechanism of horizontal gene transfer naturally responsible for the spread of antibiotic resistance genes within a bacterial population?
A) conjugation
B) generalized transduction
C) specialized transduction
D) transformation
Answer: A) conjugation
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Which statement describes the production of offspring by wingless female aphids?
a. Wingless female aphids can produce clones of female offspring by laying eggs. b. When the amount of food available in the environment increases, the number of male offspring increases. c. Wingless female aphids only produce female clones, and these clones are made without the mother laying eggs. d. Different proportions of winged male, non-egg-laying female, and egg-laying female offspring are produced based on the temperature and amount of daylight. e. Environmental conditions do not affect the sexuality of wingless female aphid offspring; sexuality is only determined genetically.
Taxonomic separation into fungal phyla is based on
a. sexual reproduction, or lack thereof. b. whether the fungus is a parasite or saprophyte. c. the production of certain metabolites, like citric acid. d. the edibility of the fungus.
During the third through the ninth months after fertilization, a developing human is called a(n) ___________
Fill in the blank(s) with the appropriate word(s).
The photic zone in aquatic environments is typically about how deep?
A. 1000 m B. 10 m C. 500 m D. 100 m E. 50 m