Molecules of water stick to each other because:
A) covalent bonds form between the hydrogen atom of one molecule and the oxygen atom of another molecule.
B) water molecules are nonpolar, and nonpolar molecules stick together.
C) hydrogen bonds form between the hydrogen atom of one molecule and a hydrogen atom of another molecule.
D) hydrogen bonds form between the hydrogen atom of one molecule and the oxygen atom of another molecule.
Answer: D
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Refer to the table above. Because the shark rectal gland functions only when ATP molecules are present, what can you infer about the movement of Na+, K+, and Cl-?
A) Movement of these ions from circulation into the rectal gland is an active process. B) Movement of these ions takes place from a region of higher concentration to a region of lower concentration. C) These ions move into the rectal gland down their concentration gradient. D) The rectal gland is unable to concentrate these ions.
Host ________ is the process by which some cells are capable of degrading an exogenote.
Fill in the blank(s) with the appropriate word(s).
In ____, antibodies bind to toxin molecules, preventing them from carrying out their damaging action
a. inflammation b. phagocytosis c. agglutination d. neutralization e. clonal selection
All of the products of the light-dependent reactions
of photosynthesis listed below are used in the lightindependent reactions EXCEPT for a. O2. b. electrons. c. NADPH. d. ATP. e. hydrogen protons contributed by NADPH.