Many primate adaptations were responses to living in ____
a. warm climates
b. trees
c. underground burrows
d. deserts
e. grasslands
ANSWER: b
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Ras is like a G protein because it:
A. triggers the formation of cyclic AMP. B. responds to the activation of G protein-coupled receptors. C. is only active when it binds GTP. D. All of these answer options are correct.
Four of the five answers listed below are stages of actual nuclear division. Select the exception
a. anaphase b. prophase c. interphase d. telophase e. metaphase
Plants in the desert-adapted families Cactacea (cactus) and Euphorbia (euphorbs) share many of the same physical characteristics, such as succulent stems that store water and CAM photosynthesis, but they do not share a recent common ancestor. This evidence suggests that these families are an example of
A. vestigial structures. B. homologous structures. C. divergent evolution. D. convergent evolution.
Answer the following questions true (T) or false (F)
1. The X and Y chromosomes are not homologous, but in the meiosis of sperm formation, they pair and separate in anaphase I as though they were homologous. 2. Mendel's contribution to genetics was the discovery of DNA. 3. Mendel's crosses with pea plants disproved the notion that, when individuals with two different traits are mated, the genetic information blends in the offspring and is not retained as separate elements.