Which organisms obtain energy from sunlight?
a. chemotrophs
b. phototrophs
c. autotrophs
d. heterotrophs
Ans: b. phototrophs
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The protostome developmental sequence arose just once in evolutionary history, resulting in two main subgroups—Lophotrochozoa and Ecdysozoa. What does this finding suggest?
A) These two subgroups have a common ancestor that was a deuterostome. B) The protostomes are a polyphyletic group. C) Division of these two groups occurred after the protostome developmental sequence appeared. D) The lophotrochozoans are monophyletic.
What cell type would have a high concentration of metabolic enzymes?
A. nerve cell B. mammary cell C. lung cell D. liver cell E. cartilage cell
The suborder Anthropoidea includes:a
monkeys, apes, and humans. b. humans only. c. apes and monkeys only. d. lemurs, galagos, and lorises. e. monkeys and lemurs.
If sperm cells are not released by ejaculation,
A. they can be stored for weeks in the prostate. B. they die and are absorbed into the body. C. the man stops producing sperm. D. prostate cancer will develop.