The hydrostatic skeleton of the earthworm allows it to move around in its environment by _____
A) walking on its limbs
B) crawling with its feet
C) swimming with its setae
D) using peristaltic contractions of its circular and longitudinal muscles
E) alternating contractions and relaxations of its flagella
Answer: D
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Molecules made primarily of carbon and hydrogen are called hydrocarbons. How many hydrogen atoms are present in each of the following molecules? A hydrocarbon chain of five carbons joined to each other by single covalent bonds?
A. 6 B. 8 C. 10 D. 12
In the figure above, representing transcription, the item labeled "B" is
a. the nontemplate strand. b. RNA-DNA hybrid. c. DNA double helix. d. the RNA copy. e. the template strand.
What does it mean to say that a characteristic of an organism is heritable?
a. The characteristic evolves. b. The characteristic can be passed on to offspring. c. The characteristic is advantageous to the organism. d. The characteristic does not vary in the population.
Which of the following is NOT a monophyletic group?
A) Turtles and lizards B) You, your parents, and your siblings C) The family Semionotidae, which includes fish that may not share a common ancestor D) The class Mammalia, which includes all mammals E) The kingdom Animalia, which includes all animals