How many principles are there in Koch's postulates of disease?
A) 1 B) 2 C) 3 D) 4 E) 5
Answer: D
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Why is transcription-coupled repair (TCR) considered particularly efficient when compared to nucleotide excision repair (NER)?
A. The exinuclease employed in TCR removes a smaller fragment containing the damage. B. TCR targets transcriptionally active regions for repair over damage in less active parts of the genome. C. It uses error-prone polymerases so it can move through damaged areas faster. D. It directly repairs the damage rather than removing and replacing the damaged strand. E. TCR requires less protein interactions.
A cross between two purple flowers that are heterozygous for their traits is an example of a ________
a. monohybrid cross b. dihybrid cross c. Punnett square d. test cross e. None of these choices.
Which of the following represents a synthesis reaction?
A. A + B ? AB B. AB ? A + B C. AB + XY ? AY + XB D. AB + XY ? AY + XB
Members of which group(s) can be single-celled producers?
a. plants b. protists c. bacteria d. bacteria and protists e. bacteria and plants