An atom or molecule becomes a(n) (anion/ion/cation) when it loses an electron to a more electronegative molecule.
Fill in the blank(s) with the appropriate word(s).
cation
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Which strategy can be used for regulation of metabolism?
A. Feedback inhibition B. Regulation of enzyme synthesis C. Covalent modification of enzymes D. Allosteric regulation E. All of the choices are correct.
Hemoglobin is a(n) ____________________-containing protein in red blood cells. Fill in the blank(s) with the appropriate word(s)
L-lysine is an essential amino acid and must be supplied in the diet. By comparison, the stereoisomer D-lysine is not biologically active. Why can your body only utilize one form?
A. Since the L form and D form are enantiomers, they will bind together and inhibit utilization of the D form. B. Antibodies recognize the D form and destroy it before your body can use it for nutritional purposes. C. Enzymes can only recognize a single, specific stereoisomer. D. Since the L form and D form are chiral molecules, they will bind together and inhibit utilization of the D form.
Some ________ may have pili.
A. eukaryotes B. archaea C. bacteria D. prokaryotes E. eukaryotes and bacteria