Identify two different types of mating systems and list the advantages and disadvantages of each. What will be an ideal response?
Polygyny: males fertilize the eggs of many females during a breeding season. Males ensure
reproductive success but make little parental investment in their offspring.
Polyandry: one female mates with several males. Females may benefit from receiving gifts or
assistance from several males; in addition, infanticide may be reduced. However, it is not
certain who fathered the offspring.
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Rank the following in order from most general to most specific: 1. gametic isolation 2. reproductive isolating mechanism 3. sperm-egg incompatibility in sea urchins 4. prezygotic isolating mechanism
A) 2, 3, 1, 4 B) 2, 4, 1, 3 C) 4, 1, 2, 3 D) 4, 2, 1, 3 E) 2, 1, 4, 3
Describe two mechanisms that Archaea use to avoid their DNA melting at temperatures above 100 °C
What will be an ideal response?
Which of the following is not a common mechanism by which antifungal agents work?
A) by binding with cell membrane sterols B) by blocking nucleic acid synthesis C) by dissolving hyphae D) by interfering with sterol synthesis
The water activity in foods that have high levels of salt or sugar is
A. high. B. dense. C. low. D. osmotic.