Compared to C3 plants, C4 plants _____
A) can continue to fix CO2 even at lower CO2 concentrations and higher oxygen concentrations
B) have higher rates of photorespiration
C) do not use rubisco for carbon fixation
D) make a four-carbon compound, oxaloacetate, which is then delivered to the citric acid cycle in mitochondria
A
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What is the most abundant metabolic waste produced by animals?
a. ketones b. sodium ions c. ammonia d. uric acid e. water
Red algae can survive in deeper water because
of
a. phycobilins. b. holdfasts. c. chlorophyll a. d. a stonelike cell wall. e. their preference for freshwater habitat.
Which of the following types of mutations are thought to be the LEAST common?
a. somatic mutations b. germ-line mutations c. neutral mutations d. harmful mutations e. beneficial mutations
Homologous recombination is an important mechanism in which organisms use a "backup" copy of the DNA as a template to fix double-strand breaks without loss of genetic information
Which of the following is not necessary for homologous recombination to occur? (a) 3? DNA strand overhangs (b) 5? DNA strand overhangs (c) a long stretch of sequence similarity (d) nucleases