This arthropod has a single pair of antennae,
three pairs of legs, and a chitin cuticle. This
arthropod is ___.
a. a crab
b. a tick
c. an isopod
d. an ant
e. more than one of these
D
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What are the principal structural components of cilia and flagella?
a. intermediate filaments b. myosin microfilaments c. actin microfilaments d. microtubules
In a certain ecosystem, rattlesnakes are predators of prairie dogs. An unusually wet spring increases the population of grasses and other plants that prairie dogs eat. The prairie dog population increases. How is the ecosystem most likely to regain stability?
a) the rattlesnake population will start to increase b) the prairie dog population will decrease rapidly c) the prairie dog population will begin to prey on the rattlesnakes d) the rattlesnake population will start to decrease
In a process called coevolution, two species exert natural selection pressures on each other
Indicate whether the statement is true or false
Which nucleotide sequence is complementary to the DNA sequence 5'-GACGTT-3'?
a. 5'-TCATGG-3' b. 3'-TCATGG-5' c. 3'-CTGCAA-5' d. 3'-AGTACC-5' e. 5'-TTGCAG-3'