____________ asteroids are more common in the outer asteroid belt where it is cooler. They are darker and may be carbonaceous
a. S-type
b. M-type
c. C-type
c
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Why is it thought that the majority of natural selection is stabilizing selection?
A. Most mutations are deleterious and produce an extreme phenotype that is selected against. B. Most mutations are beneficial and produce intermediate phenotypes. C. Mutations produce extreme phenotypes, which are selected for. D. Artificial selection is the most common, which is a type of stabilizing selection. E. Directional selection is more common because it increases adaptations to the environment.
Which muscle type is found in the walls of body tubes and cavities of vertebrates, such as blood vessels and the
intestines?
a. cardiac b. smooth c. skeletal d. rough e. epithelial
If the heterozygous phenotype is intermediate between those of the two different homozygotes, this is called
a. epistasis. b. independent assortment. c. codominance. d. incomplete dominance. e. polygenic.
The nucleolus is the site where _______ is/are assembled.
a. nuclear pores b. ribosomal subunits c. chromatin d. the nuclear matrix