Jenny is losing weight, has poor tolerance to heat, and has mood swings, high blood pressure, and a rapid heart rate. She has very high levels of thyroid hormone, high levels of TSH, and a goiter
Which of these diagnoses is the most likely for Jenny's condition? A) defective thyroid hormone receptors in the body cells
B) insufficient iodine in the diet
C) defective receptors for thyroid hormone control by the anterior pituitary
D) too much iodine in the diet
C
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Which isolating mechanism is postzygotic?
A. hybrid sterility B. behavioral isolation C. ecological isolation D. mechanical isolation E. temporal isolation
Some types of dinoflagellates (single-cell eukaryotes) show a circadian rhythm. They produce light for about 12 hours in the dark (at night) and photosynthesize for about 12 hours in the light (during the day)
Say you took some dinoflagellates at the end of their 12 hours of darkness and put them on a 24-hour light cycle. How would the cells likely respond during the first day of that cycle? A. The cells would photosynthesize for the full 24 hours. B. The cells would photosynthesize for more than 12 hours but less than the full 24 hours. C. The cells would produce light for the full 24 hours. D. The cells would not produce light or photosynthesize.
Chromosomal rearrangement can occur by ____
a. translocation only b. inversion only c. translocation and inversion d. point mutations e. alternative splicing
Which pair represents the correct complementary bonding of nitrogen containing bases in a DNA molecule?
a. adenine and cytosine b. adenine and guanine c. cytosine and thymine d. guanine and cytosine e. guanine and thymine