Why is it useful to know the structure of a protein when trying to understand a protein's function?
a. Scientists still don't know exactly what features of a protein's structure determine how a
protein works. By gathering information about many different protein structures and
correlating them to their known functions, we can try to figure out this relationship.
b. Since all proteins have enzymatic activity, we hope to learn what features of a protein
make an enzyme a catalyst.
c. Since x-rays are used on protein crystals to determine the structure, this research can help
us understand the ways in which x-rays can be damaging to the proteins of living cells.
d. The enzymatic activity of a protein cannot be measured unless we also have the structure
of that enzyme.
e. We need to know which amino acids are essential for a cell to function. If we know the
structure of an enzyme, we can determine which amino acids are present and how they
work in the cell.
A
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Which structure is correctly paired with its tissue system?
A) root hair â€" vascular tissue B) guard cell â€" vascular tissue C) companion cell â€" ground tissue D) tracheid â€" vascular tissue
At present there are four phyla in the domain Bacteria
Indicate whether the statement is true or false.
The current understanding of the membranes of the cell is based on the ________ model.
Fill in the blank(s) with the appropriate word(s).
Smooth muscle is found in
a. arms and legs. b. the walls of hollow organs and tubes. c. the heart. d. the brain. e. appendages only.