What type of fiber accounts for the strength of various connective tissues?
A. reticular
B. elastic
C. actin
D. collagen
Answer: D
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A chromosome of genotype C D recombines with a homolog of genotype c d during meiosis when Spo11 produces a double-strand break between the two loci. If anticrossover helicase disentangles the invading strand, the likely outcome would be
A) two C D and two c d gametes. B) two C d and two c D gametes. C) one C D, one C d, one c D, and one c d gamete. D) four C D gametes. E) four c d gametes
Eutrophication can be caused by excess accumulation of in a body of water.
A. phosphorus B. nitrogen or phosphorous C. carbon D. nitrogen or carbon E. nitrogen
The plural for genus is
a. genus. b. geni. c. genera. d. gena. e. genae.
What role is played by tRNA?
a. tRNA provides the mechanism that replaces thymine in DNA with uracil in mRNA. b. tRNA joins its amino acid to the peptide chain when it matches an mRNA codon. c. tRNA unwinds mRNA in advance of the polymerase responsible for transcription. d. tRNA binds to the promoter region and recruits the correct polymerase for transcription.