The enzyme _____ repairs 99% of mismatched bases immediately during replication
A. DNA ligase
B. DNA polymerase
C. AP endonuclease
D. uracyl glycosylase
E. none of these
B
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A cataract involves:
a. clouding of the lens b. damage to the macula c. damage to the cornea d. destruction of the fovea e. destruction of cone cells in retina
How are humans able to produce billions of unique B and T cell receptors?
a. Each time a pathogen is encountered, a new receptor is produced. b. The two different genes that encode receptor proteins, allow for many versions of receptors to be produced. c. Random splicing of gene segments encoding receptor proteins allows for 2.5 billion potential combinations. d. Antigen presenting cells stimulate B and T cells to each produce billions of receptor molecules. e. There are billions of B and T cells, each of which produces a single receptor on its cell surface.
The conducting tissues of vascular plants are rigid because they contain ________ in their cell walls
Fill in the blank(s) with correct word
Why are there fewer tRNA anticodons than the 61 needed to match each mRNA codon that codes for an amino acid?
A. There is some flexibility in pairing between all 3 bases of the codon and all 3 bases of the anticodon. B. There is some flexibility in pairing between the 5' base of the codon and the 3' base of the anticodon. C. There is some flexibility in pairing between the middle base of the codon and the middle base of the anticodon. D. There is some flexibility in pairing between the 3' base of the codon and the 5' base of the anticodon.