Which of the following best describes the photosynthetic membranes of Chlorobia?
A. Accessory bacteriochlorophylls are located in the plasma membrane, but the reaction center bacteriochlorophyll is located in the chlorosomes.
B. Accessory bacteriochlorophylls are located in the chlorosomes, but the reaction center bacteriochlorophyll is located in the plasma membrane.
C. Accessory and reaction center bacteriochlorophylls are located in the chlorosomes.
D. Accessory and reaction center bacteriochlorophylls are located in the plasma membrane.
Answer: B
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Why do Rh-negative but not Rh-positive mothers sometimes have babies with hemolytic disease of the newborn?
A. This disease results when an Rh-negative mother's immune system is primed multiple times to produce anti-Rh IgG antibodies that can cross the placenta. If the mother is Rh-positive, she won't produce any anti-Rh antibodies at all. B. Rh-positive mothers produce IgM antibody, not IgG. This antibody can't cross the placenta, so it can't cause hemolytic disease of the newborn. C. Rh-positive mothers will receive a preventative shot from their physician prior to conception. This will provide the protection the fetus needs AFTER conception to avoid the disease. D. Rh-negativity is also associated with hyperproduction of antibodies. As such, Rh-negative mothers are more likely than Rh-positive mothers to produce the antibodies needed to produce this disease.
A pellicle is NOT
a. thin. b. inside the plasma membrane. c. made of elastic proteins. d. intended to protect the cell. e. involved in retaining the shape of the cell..
Which statement is incorrect about acid rain?
A. Sulfuric acid in the atmosphere is carried back to earth with rain. B. It has resulted in lakes becoming devoid of life. C. In 1989, rain and snow in the Northeast often had a pH as low as 2. D. Its effects have been more devastating to the Southeast than the Northeast. E. It comes from the tall stacks of coal-burning power plants.
If body cells have too few receptors for insulin, ________
A) the insulin level is likely to decrease B) the blood glucose level may rise to abnormal levels C) the liver will need to break down more glycogen D) more glucagon will be needed