Cilia and flagella (select all correct choices):
A. are specialized cells that move by rotary
motion.
B. are specialized organelles that move by
rotary motion.
C. are specialized organelles that propel
some plant, algae, and animal cells.
D. contain microfilaments arranged in nine
pairs around the periphery and two
microfilaments in the center.
E. contain microtubules arranged in nine
pairs around the periphery and two
microfilaments in the center.
C
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For given species, the maximum rate of increase per individual under ideal conditions is its _____
a. biotic potential c. environmental resistance b. carrying capacity d. density control
Of all the plant hormones, which one is a gas?
a. auxin b. cytokinin c. gibberellin d. ethylene e. abscisic acid
The exon theory of genes states that:
a. genes consist solely of exons. b. introns are deleterious and are purged from the genome. c. introns lead to recombination errors. d. many current genes arose through the rearrangement of exons. e. introns disrupt protein structure.
CAM and C4 have evolved multiple times in a range of vascular plants because __________. (Select all correct answer options.)
A. no novel enzymes or biochemical pathways are required B. C4 and CAM photosynthesis likely evolved from C3 ancestors C. gene expression changed D. land plants evolve rapidly