Only ______ have a lung designed so that air can flow through them in one direction
a. a few fish
b. amphibians
c. birds
d. mammals
e. insects
C; Birds have very efficient lungs, designed to allow countercurrent exchange. The lungs of mammals, reptiles, amphibians, and those fish that have them simply move air in and out, using tidal movement. Insects do not have lungs at all, but rather use tracheae to supply tissues directly with air.
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If a cell has accumulated DNA damage, it is unlikely to _____
A) pass the G2 checkpoint B) activate DNA repair mechanisms C) enter G1 from mitosis D) synthesize cyclin-dependent kinases
If you were observing the early development of a chick embryo and saw patterns in terms of the placement of head and wings, you would assume that you were seeing the effects of
A. controlled gene expression. B. temperature. C. appropriate lighting. D. sex hormones. E. All of the answer choices are correct.
The dominant animal in a social hierarchy, such as a wolf pack, is called the
A) leader. B) omega. C) master. D) king. E) alpha.
Lichens are symbiotic associations that __________.
a. are found in the tissues of plants and may protect them from pathogens or herbivores b. involve a fungus and a green algae or cyanobacterium c. require moist environments to grow d. fix nitrogen for absorption by plant roots e. enabled plants to move onto land