Patients who have type 2 diabetes no longer express genes when exposed to insulin. How might this phenomenon be explained?
A. The insulin signal transduction pathway becomes permanently activated.
B. Insulin can no longer bind to the insulin receptor because the receptor is mutated.
C. The signal transduction pathways in the cells no longer exist.
D. The nucleus of their cells are altered so that insulin can not bind.
E. Transcription factors normally activated by insulin remain off.
E. Transcription factors normally activated by insulin remain off.
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Nonpolar hormones can pass through the intestinal cell membrane without being digested, and therefore can be taken orally. Which of the following hormones are available as pills?
A. insulin and growth hormone B. thyroid hormone and steroid hormones C. calcitonin and insulin D. insulin and steroid hormones E. calcitonin and thyroid hormone
Four of the five answers listed below are
heterotrophic. Select the EXCEPTION.
a. consumers b. carnivores c. herbivores d. parasites e. producers
Which of the following is needed as a reactant for the first step of the citric acid cycle?
a. Malic acid b. Succinyl CoA c. Oxaloacetic acid d. Citric acid
When genes for the same trait occur in a variety of forms, each unique form is called a(n) _____.
A) homologue B) allele C) mutant D) chromatid