Researchers found E. coli that had mutation rates one hundred times higher than normal. Which of the following is the most likely cause of these results?
A) The single-stranded binding proteins were malfunctioning.
B) There were one or more mismatches in the RNA primer.
C) The proofreading mechanism of DNA polymerase was not working properly.
D) The DNA polymerase was unable to add bases to the end of the growing nucleic acid chain.
C
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Four of the following are major features of arthropods. Which is the exception?
a. jointed appendages b. exoskeleton c. paired segmental nephridia d. specialized segments that are fused together e. specialized sensory structures
Normally, only one sperm fertilizes an egg. What role do other sperm play?
A. They assist the fertilizing sperm in penetrating the egg. B. They trigger chemical changes in the egg. C. They dissolve the outer barriers surrounding the oocyte. D. They assist the fertilizing sperm in penetrating the egg and trigger chemical changes in the egg. E. They trigger chemical changes in the egg and dissolve the outer barriers surrounding the oocyte.
A portion of an mRNA attached to a ribosome reads: 5? GACCAUUUUUGA 3? If a tRNA with a histidine amino acid attached is in the P site of the ribosome, a tRNA with which amino acid attached will enter the A site?
A) aspartic acid B) proline C) serine D) phenylalanine E) tyrosine
The maintenance of the HbS (sickle) allele in humans is an example of homozygote advantage
a. True b. False