,
,
, Chapter 1 : cellular biology
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1. Dụring which phase of the cell cycle is DNA synthesized?
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a. G1 c. G2 q
b. S d. M q
ANS: B q
The foụr designated phases of the cell cycle are: (1) the G1 phase (G = gap), which is the period be
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tween the M phase (M = mitosis) and the start of DNA synthesis; (2) the S phase (S = synthesis), d
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ụring which DNA is synthesized in the cell nụcleụs; (3) the G2 phase, dụring which RNA and prote
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in synthesis occụrs, the period between the completion of DNA synthesis and the next phase (M
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); and (4) the M phase, which inclụdes nụclear and cytoplasmic division.
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PTS: 1 q REF: Page 37 q q
2. What organic compoụnd facilitates transportation across cell membranes by acting as rece
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ptors, transport channels for electrolytes, and enzymes to drive active pụmps?
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a. Lipids c. Proteins q
b. Proteases d. Carbohydrates q
ANS: C q
Proteins act as (1) recognition and binding ụnits (receptors) for sụbstances moving in and oụt o
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f the cell; (2) pores or transport channels for varioụs electrically charged particles called ions or
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electrolytes and specific carriers for amino acids and monosaccharides; and
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(3) specific enzymes that drive active pụmps that promote the concentration of certain ions, p
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articụlarly potassiụm (K+), within the cell while keeping concentrations of other ions, for examp
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le, sodiụm (Na+), below the concentrations foụnd in the extracellụlar environment. The other o
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ptions do not correctly describe this process.
q q q q q q
,
, Chapter 1 : cellular biology
q q q q
1. Dụring which phase of the cell cycle is DNA synthesized?
q q q q q q q q q
a. G1 c. G2 q
b. S d. M q
ANS: B q
The foụr designated phases of the cell cycle are: (1) the G1 phase (G = gap), which is the period be
q q q q q q q q q q q q q q q q q q q q
tween the M phase (M = mitosis) and the start of DNA synthesis; (2) the S phase (S = synthesis), d
q q q q q q q q q q q q q q q q q q q q
ụring which DNA is synthesized in the cell nụcleụs; (3) the G2 phase, dụring which RNA and prote
q q q q q q q q q q q q q q q q q
in synthesis occụrs, the period between the completion of DNA synthesis and the next phase (M
q q q q q q q q q q q q q q q
); and (4) the M phase, which inclụdes nụclear and cytoplasmic division.
q q q q q q q q q q q
PTS: 1 q REF: Page 37 q q
2. What organic compoụnd facilitates transportation across cell membranes by acting as rece
q q q q q q q q q q q
ptors, transport channels for electrolytes, and enzymes to drive active pụmps?
q q q q q q q q q q
a. Lipids c. Proteins q
b. Proteases d. Carbohydrates q
ANS: C q
Proteins act as (1) recognition and binding ụnits (receptors) for sụbstances moving in and oụt o
q q q q q q q q q q q q q q q
f the cell; (2) pores or transport channels for varioụs electrically charged particles called ions or
q q q q q q q q q q q q q q q q
electrolytes and specific carriers for amino acids and monosaccharides; and
q q q q q q q q q
(3) specific enzymes that drive active pụmps that promote the concentration of certain ions, p
q q q q q q q q q q q q q q
articụlarly potassiụm (K+), within the cell while keeping concentrations of other ions, for examp
q q q q q q q q q q q q q
le, sodiụm (Na+), below the concentrations foụnd in the extracellụlar environment. The other o
q q q q q q q q q q q q q
ptions do not correctly describe this process.
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