If, when water froze, every water molecule formed a hydrogen bond with only one additional water molecule, which of the following would not happen?
a. Many aquatic organisms would not survive cold temperatures.
b. Ice would likely sink to the bottom of lakes and rivers.
c. Ice would be less dense than liquid water.
d. Water molecules in ice would demonstrate a disorganized, non-lattice arrangement.
e. Bodies of water would appear to freeze from the bottom up.
Ans: c. Ice would be less dense than liquid water.
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A. gene pool B. allele frequency C. genotype frequency D. genotype E. phenotype
Glucose enters cells by
A. osmosis. B. diffusion. C. facilitated transport. D. active transport. E. receptor-mediated endocytosis.
What is it called when a single-celled zygote begins to develop by undergoing rapid cell division?
a. expansion b. differentiation c. cleavage d. meiosis
In eukaryotes, what modification occurs to the
mRNA transcript?
a. the non-coding segments are removed b. the thymines are removed and replaced with uracils c. cytosines are added to the ends of the transcripts d. coding segments are methylated e. more than one of these modifications occur