Herbivores are unable to synthesize about half of the 20 ________ that are required to make proteins
Fill in the blank(s) with correct word
amino acids
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The earliest evidence of biochemical reactions by living cells dates to about ____ billion years ago
a. 0.5 b. 1 c. 1.5 d. 2 e. 3.7
In the figure above, representing transcription, the item labeled "A" is
a. reverse transcriptase. b. primase. c. the spliceosome. d. RNA polymerase. e. DNA helicase.
Receptors in the human nose are
a. chemoreceptors. b. mechanoreceptors. c. photoreceptors. d. nociceptors. e. none of these.
The archeological record indicates when people began using various grains and legumes and when these food plants were domesticated
Looking at the figure below, estimate how long humans have been selectively breeding grains. (Note that the gaps in the figure represent periods when no evidence of the crop indicated was found.) What will be an ideal response?