Tumor suppressor genes function to
A) prevent gene expression of oncogenes.
B) prevent release of growth factors.
C) slow down unchecked cell growth, differentiation, division, or adhesion.
D) produce proto-oncogenes.
E) stimulate metastasis.
C
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Chlorophyll a appears green to the human eye because it ________
a. absorbs green light b. absorbs violet and red light c. reflects blue light d. reflects violet and red light
In general, the pool of materials in living organisms is
a. much greater than the pool found in the physical environment. b. constantly changing over a wide range. c. usually equal to the pool found in the soil. d. about the same as the pool found in the physical environment. e. much less than the pool found in the physical environment.
Insulin lowers glucose concentration in the blood, by binding to receptors on liver cells, adipose tissue, and skeletal muscle cells. What type of receptor does insulin bind to?
1.adrenergic receptor 2.G-protein–coupled receptor 3.internal receptor 4.receptor tyrosine kinase
Plant species A has a diploid number of 28 chromosomes, while Plant species B has a diploid number of 14 chromosomes. Species A and B produce a hybrid through alloploidy. The diploid number of chromosomes of the hybrid is
A. 28. B. 42. C. 14. D. 21.