_____, which probably evolved from infoldings of the plasma membrane, first appear in the fossil record about 1.8
million years ago.
a. Eukaryotes
b. Archaea
c. Plants
d. Bacteria
e. Photosynthesizers
ANSWER: a
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What does it mean when we say the genetic code is redundant?
A) A single codon can specify the addition of more than one amino acid. B) The genetic code is different for different domains of organisms. C) The genetic code is universal (the same for all organisms). D) More than one codon can specify the addition of the same amino acid.
Why is repairing a single-stranded break easier to repair than a double-stranded break?
What will be an ideal response?
What second messenger is directly involved in activating protein kinase C (PKC)?
A. DAG B. cAMP C. cGMP D. Phospholipase C E. G protein
The C4 mechanism of carbon fixation is an advantage for plants that live in:
a) ponds or other bodies of fresh water. b) swamps or bogs. c) the shade of other plants. d) hot, dry climates. e) tropical climates.