The unique feature of HeLa cells that make them
important for research is that
a. they are identical to all other human cells.
b. they are immortal cells and will grow in culture.
c. they are limited in growth cycles.
d. they are like stem cells.
e. all of these make them important.
Answer: b
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Select the reaction that is most likely to be a tropism.
A. Flowers blooming when it is warm. B. Production of aerenchyma. C. Plants bending away from a heat source. D. Induction of seed dormancy.
The secretion of pepsinogen and HCl is controlled by the hormone
A. insulin. B. gastrin. C. pepsin. D. secretin. E. cholecystokinin.
Which of the following is typical of an endocrine gland?
A. It secretes into a duct. B. It produces enzymes for digestion. C. It usually secretes its products into the circulatory system. D. It increases the metabolic rate.
Although containing a full set of chromosomes, secondary spermatocytes are considered haploid because _____.
A) the human diploid number is 92 B) meiosis I separates the homologous chromosomes from one another C) crossing over has already occurred D) the duplicated chromosomes exist as sister chromatids