Arthropods with mandibles, a single pair of antennae, and two legs on most body segments are:a
ribbon worms.
b. centipedes.
c. millipedes.
d. trilobites.
e. mites.
c
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How many quanta of light are needed to reduce one molecule of carbon dioxide to carbohydrate during photosynthesis?
A. 10-12 B. 2 C. 3 D. 4
If you transfuse type AB blood into a patient with type A blood, the patient will raise antibodies against the B antigen on the donor's blood, but will not raise antibodies against the A antigen. Why not?
A. B and T cells that recognize the A antigen will have been removed by clonal deletion. B. Antibodies that recognize the A antigen will have been removed by the spleen. C. Antibodies that recognize the A antigen will have been removed by the bone marrow. D. Macrophages will not present the A antigen to T cells. E. Recombination of the gene for antibodies cannot produce self-reactive clones.
The electronegativity of nitrogen (N) is 3.0, while the electronegativity of hydrogen (H) is 2.1. Knowing this, consider how the electrons will be shared in ammonia (NH3). What do you predict about the polarity of ammonia?
A. Each H atom has a partial positive charge. B. The N atom has a strong positive charge. C. The N atom has a partial positive charge. D. Each H atom has a partial negative charge.
The part of corn that is used for fuel or food for humans is the
A) fruit. B) root. C) zygote. D) flower.