On a dark night, the rods have a high concentration of
A) cGMP. B) cAMP. C) opsin. D) kinase.
A) cGMP.
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The functional unit of the kidney that filters blood and forms urine is the ________.
A) glomerulus B) nephron c) renal pyramid D) renal pelvis
A mature red blood cell lacks a nucleus; therefore, it
A) can repair itself readily. B) is malformed. C) can only divide once more. D) will be a long-lived cell. E) cannot make new proteins and will be worn out within a few months.
Using Figure 3.1, match the following:
1) Produces ATP aerobically
2) Site of enzymatic breakdown of phagocytized material.
3) Packages proteins for insertion in the cell membrane or for exocytosis.
4) Site of synthesis of lipid and steroid molecules.
5) Forms the mitotic spindle.
6) Replicate for cell division.
7) Source of cell autolysis.
What kind of bond is formed when one atom gains an electron and another atom loses an electron?
a. ionic b. covalent c. hydrogen d. molecular