A decrease in the amount of carbon dioxide present in the air surrounding most plants would most likely result in
Answer(s): C
Carbon dioxide is needed in the Calvin cycle to produce sugars, and there is no connection between the Calvin cycle and the building of nitrogen-producing compounds by a plant. The decrease in carbon dioxide would most likely not result in the plant's death, but it might hurt the plant by decreasing its ability to produce sugars. Chlorophyll molecules should be unaffected.
Fertilization of a human ovum normally occurs in the
Answer(s): E
The oviduct, or fallopian tube, is the usual site of fertilization of the ovum. It is here, after being released from the ovary, that an egg is most likely to meet sperm cells coming up from the vagina.
A DNA strand has a base sequence of CGTAGT. The mRNA strand transcribed from this DNA is:
When DNA is transcribed into messenger RNA, the base-pairings are complementary but not identical. In addition, RNA has no thymine (T), only uracil (U). Thus, the correct complementary pairing would be A's with U's, T's with A's, and C's with G's or CGTAGT -> GCAUCA.
Diabetics may have sugar in their urine because
Answer(s): B
Diabetics may suffer from a buildup of sugar in their bloodstream because their bodies produce too little insulin (which is normally responsible for pulling sugar out of the bloodstream and into cells), and/or their body's response to insulin is reduced (a condition known as insulin resistance). Although the disease may cause damage to the kidneys eventually, the disease is not caused by any kidney malfunction.
Damage to the cells lining the large intestine would likely result in
Answer(s): A
The large intestine is responsible for the absorption of salts and water from the digestive system. If damaged, excess water can remain in the digestive tract and cause watery stools, or diarrhea.
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