Sickle cell disease patients have a ___________ mutation, which is a change from glutamic acid to valine, in their hemoglobin genes.
Fill in the blank(s) with the appropriate word(s).
Ans: missense
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The attraction between Na+ cations and Cl? anions forms ____ that hold together the compound NaCl
a. polar covalent bonds b. van der Waals forces c. ionic bonds d. hydrogen bonds e. nonpolar covalent bonds
Clusters of cell bodies of neurons are known as:
a. nerve cords b. ganglia c. a plexus d. notochords e. nerves
Genes on newly synthesized DNA molecules can be
blocked by the addition of __________ to the DNA. a. –CH3 b. –CH3COc. –NH2 d. –H2O e. any of these
During the Cambrian,
a. animals started a great adaptive radiation. b. all major groups of animals originated in the seas. c. changes in land masses, climate, and sea level contributed to animal evolution. d. coevolution of predators and prey and of parasites and hosts was a factor in evolution. e. all of these occurred.