This chordate has a four-chambered heart, no
bladder, the males typically have no penis, and
no teeth. This animal is
a. a bird.
b. a crocodile.
c. a bat.
d. a frog.
e. a shark
A
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The power stroke corresponds to which event in muscle contraction?
A. cross-bridge formation. B. sliding of actin with respect to myosin C. cocking of the myosin head D. binding of the myosin head to actin
A plant cell with 64 available ATP molecules could split how many N2 molecules with the assistance of nitrogenase?
A. 4 B. 32 C. 2 D. 16 E. 64
Why are new flu shots necessary every year?
A) The antiviral chemicals in flu shots last only 11 months. B) Flu shots do not result in the production of memory cells. C) Depending on the year, either bacteria or viruses cause the flu. D) Flu viruses have a high mutation rate.
All of the individuals in a cross between an RR plant and an rr plant will be:
a. dominant. b. recessive. c. homozygote. d. heterozygote. e. red.