Metabolic channeling involves the localization of ________ in different parts of a cell in order to influence the activity of metabolic pathways.
A. repressors
B. substrates and enzymes
C. inhibitors
D. activators
Answer: B
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What is the difference between the trithorax (TrxG) and polycomb (PcG) complexes of proteins?
A. TrxG proteins methylate lysine 27 on histone H3 while PcG complexes methylate lysine 4 on H3 B. Methylation of lysine at position 4 on H3 results in silencing of gene expression C. TrxG complex proteins activate gene expression by methylating lysine 4 on H3, while PcG complex proteins repress gene expression by methylating lysine 27 on H3. D. Methylation of H3 on lysine 27 can result in activation of transcription
The ability to determine where a sound is coming from depends primarily on
A. differences in sound intensity in the two ears. B. differences in time of sound arrival to the two ears. C. differences in sound frequency received at the two ears. D. differences in both frequency and intensity at the two ears. E. None of these choices are correct.
The eyespot is a light-sensitive structure found in photosynthetic kinetoplastids
Indicate whether the statement is true or false.
In the establishment of rhizobia in a legume, infection threads are found in the:a
stele. b. cortex. c. root hairs. d. xylem. e. phloem.