Which of the following is (are) proposed to be a function of telomeres?
a) They are required for the complete replication of the chromosome.
b) They prevent the ends of chromosomes from fusing with one another.
c) They form caps that protect the chromosomes from nucleases and other destabilizing influences.
d) All of the choices are correct.
Ans: d) All of the choices are correct.
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Which of the following statements is true about buffer solutions?
A) They maintain a constant pH when bases are added to them but not when acids are added to them. B) They maintain a constant pH when acids are added to them but not when bases are added to them. C) They fluctuate in pH when either acids or bases are added to them. D) They maintain a relatively constant pH when either acids or bases are added to them.
Which statement about receptors is false?
a. They are highly selective. b. They are also called ligands. c. They are proteins or glycoproteins. d. They are found inside the cell and on the cell surface. e. They are activated by binding to a signaling molecule.
Nitrification and denitrification differ in that ________.
A. nitrification oxidizes ammonia into a still-usable form, whereas denitrification oxidizes a usable form of nitrogen into unusable nitrogen gas B. nitrification adds a nitrogen atom to an organic compound, whereas denitrification removes a nitrogen atom from an organic compound C. nitrification produces ammonia whereas denitrification produces the nitrite ion D. nitrification oxidizes the nitrate ion into unusable nitrogen gas, whereas denitrification oxidizes ammonia into the nitrite ion
In ________ immunity, an individual makes their own antibodies in response to antigen exposure, whereas in ________ immunity, an individual receives antibodies made by another individual(s).
A. passive; active B. natural; artificial C. active; passive D. natural; active E. artificial; active