Celery stalks that are immersed in fresh water for several hours become stiff and hard. Similar stalks left in a salt solution become limp and soft. From this we can deduce that the cells of the celery stalks are
A) isotonic with fresh water but hypotonic to the salt solution.
B) hypotonic to fresh water but hypertonic to the salt solution.
C) hypotonic to both fresh water and the salt solution
D) hypertonic to both fresh water and the salt solution.
E) hypertonic to fresh water but hypotonic to the salt solution.
A cell whose cytoplasm has a concentration of 0.02 molar glucose is placed in a test tube of water containing 0.02 molar glucose. Assuming that glucose is not actively transported into the cell, which of the following terms describes the tonicity of the external solution relative to the cytoplasm of the cell?
In yeast, under anaerobic conditions, the end-product of glycolysis is converted to
A) hydrochloric acid
B) acetic acid
C) CO2 and ethanol
D) lactic acid
The NET result of a single glycolysis run is the formation of
A) 1 NADH and 1 ATP
B) 4 NADH and 2 ATP
C) 4 NADH and 4 ATP
D) 2 NADH and 2 ATP
E) 2 NADH and 4 ATP
5.Which of the following molecules are considered products of ONLY the process of anaerobic fermentation in yeast?More than one answer may be correct. Select all that are true.
B) lactic acid
C) carbon dioxide
9.Which of the following correctly represents the mechanism of enzyme function?
A) E + P -> ES -> E + P
B) E + S -> ES -> E + P
C) S + P -> EP -> E + P
D) E + S -> ES -> S + P
E) S + P -> SP -> E + P
patient has had a serious accident and lost a lot of blood. In an attempt to replenish body fluids, distilled water, equal to the volume of blood lost, is transferred directly into one of his veins. What will be the most probable result of this transfusion?
A) The patient's red blood cells will shrivel up because the blood
fluid is hypertonic compared to the cells.
B) The patient's red blood cells will shrivel up because the blood fluid is hypotonic compared to the cells.
C) It will have no unfavorable effect as long as the water is free of viruses and bacteria.
D) The patient's red blood cells will swell because the blood fluid is hypotonic compared to the cells.
E) The patient's red blood cells will burst because the blood fluid is hypertonic compared to the cells.
4.A controlled experiment is one that
A) tests experimental and control groups in parallel (at the same
B) is supervised by an experienced scientist.
C) proceeds slowly enough that a scientist can make careful records of the results.
D) efficiently tests more than one variable at once.
E) keeps all variables constant.