The process by which the base sequence of an RNA molecule is used to direct the synthesis of a protein is called ________.
A. reverse transcription
B. translation
C. transcription
D. replication
Answer: B
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Histone variants:
A. have been identified for H2B and H4 but not for H2A and H3. B. differ in their C-terminal sequences but not in their N-terminal sequences. C. that have been identified are associated with transcriptional activation only. D. have variant patterns of modifications as a result of the structural differences in their terminal sequences. E. have been found to affect all cellular processes that involve DNA except DNA repair.
During previous flu seasons, small variations in the influenza virus resulted in the immune system's inability to full recognize and respond to flu exposure. As a result, the vaccine was less than 30% effective. This is an example of ________.
A. the founder effect B. antigenic shift C. antigenic drift D. artificial selection
The earliest forms of life on Earth obtained their energy from ________.
Fill in the blank(s) with the appropriate word(s)
Carbohydrates can be converted into
A. glycerol. B. fatty acids. C. amino acids. D. All of these answers are true.