Describe the general structural plan of amino acids
What will be an ideal response?
For 19 out of the 20 amino acids, a central carbon atom is attached to an amino group, a carboxyl
group, and a hydrogen atom, and a side group. Proline has a ring structure where the central carbon
atom is attached to a carboxyl group and an imino group.
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__________ is the conversion of grassland or
woodland to desert-like conditions. Fill in the blank(s) with the appropriate word(s).
The majority of water molecules moving across plasma membranes by osmosis do so via a process that is most similar to ____.
a. active transport b. simple diffusion c. facilitated diffusion d. a process that requires energy from the cell e. cotransport
The body of a cnidarian is supported by a(n) hydrostatic skeleton
____________________ Indicate whether the statement is true or false.
Oxygen was necessary in the atmosphere before
A. photosynthesis could occur. B. life could begin. C. metabolism could occur. D. aerobic respiration could occur.