Which structure will integrate sensory
information?
a. skin
b. muscle
c. gland
d. brain
e. heart
D
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Chromosomes are often represented as an X, with two sister chromatids attached at the centromere. Do chromosomes always look like an X?
A. No, chromosomes only look like an X following DNA replication, and before cell division; the rest of the time, they only have one sister chromatid each. B. No, chromosomes only look like an X right after cell division; the rest of the time, they have only one sister chromatid each. C. Yes, chromosomes are always made up of two sister chromatids attached. D. No, chromosomes only look like an X when condensed, but they always have two sister chromatids attached.
Which of the following statements accurately describes the role of insects in early angiosperm evolution?
A. Insect pollination may have allowed early angiosperms to thrive in the understory habitats of tropical rain forests. B. Insect pollination may have allowed early angiosperms to thrive in the canopy of tropical rain forests. C. Mammal pollination may have contributed to early angiosperm success. D. Very few living members of the earliest angiosperm lineages produce flowers that are visited by insects. E. Insects did not play a significant role in early angiosperm evolution.
Which of the following best describes cyanobacteria?
A. They all can use H2S as a source of electrons for photosynthesis. B. Their photosynthetic pigments are carried in chlorosomes. C. They carry out anoxygenic photosynthesis. D. They carry out oxygenic photosynthesis.
According to the competitive ________ principle, two "complete competitors" cannot coexist
Fill in the blank(s) with correct word