In arthropods, locomotion is accomplished by muscles that work against
A. mineralized bones.
B. the exoskeleton.
C. each other.
D. the pseudocoel.
E. a hydrostatic skeleton.
Answer: B
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Several lineages of extinct ____ were jawless fishes with bony plates and scales and three brain regions (forebrain,
midbrain, and hindbrain).
a. acanthodians b. conodonts c. osteolepiforms d. placoderms e. ostracoderms
Which of the following is a disadvantage of sexual reproduction?
a. It produces genetically diverse offspring. b. Large numbers of offspring can be produced quickly. c. Only half the population can produce offspring. d. Organisms have both male and female reproductive systems.
Recall that your text states the following energy analogies:
a. ATP is compared to a few coins in your pocket. b. Creatine phosphate is compared to a handful of dollars. c. The glycolytic system is like an account in the bank. d. The oxidative energy system is compared to stocks and bonds.In your own words explain why each is a valid comparison.
If an organism has three pairs of chromosomes,
how many possible combinations of homologous chromosomes could result from meiosis?
a. 2 b. 4 c. 8 d. 16 e. 32