Molecules can be described as polar when _____.
A) they are long and thin
B) the molecules have a distinct top and bottom
C) the electrons in one or more covalent bonds are shared unequally
D) they readily dissolve in oil or turpentine
Ans: C) the electrons in one or more covalent bonds are shared unequally
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Chromatin may be remodeled by: (Select all correct choices)
A. chemical modification of the nucleotide bases of the DNA. B. mutations affecting the structure of the chromosome's non-histone proteins. C. chemical modification of the chromosome's histone proteins.
The human immunodeficiency virus mounts a direct attack on TH cells by recognizing the _______ surface proteins associated with these cells.
A. Fc B. CD4 C. epitope D. cytokine
What is characteristic of dry shrublands (chaparral)?
a. Cool, wet winters are followed by hot, dry summers. b. Primary production is abundant throughout the year. c. Constant cool temperatures prevail throughout the year. d. Winters are mild and summers are wet. e. Precipitation occurs evenly year round.
Tomato seeds are often consumed by birds or other organisms and then deposited through feces. However, when tomatoes rot on the vine, organisms may not consume them. How would tomato seeds likely disperse in this situation?
A) When the tomato rots, it drops to the ground and the seeds fall in the soil. B) Summer rains carry the seeds to a new area. C) Windy conditions carry the seeds to a new area. D) The tomato disperses its seeds as spores.