A pollen grain “knows” when to germinate due to
which of the following?
a. differentiation upon contact with the flower
b. exposure to moisture
c. cell signaling pathways
d. electromagnetic impulses from the flower
e. none of these
Answer: c
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In performing research, you treat frog zygotes with antibodies that bind E-cadherin. As a result, you expect
A) the cells to become exclusively muscle tissue. B) the cells to be loosely associated and abort development. C) the cells to be loosely associated and develop into a novel strain of frog. D) the cells to divide uncontrollably. E) no change with regard to development.
What is the difference between endocrine and exocrine glands?
a. Endocrine glands are discrete structures, while exocrine glands may be specialized cells in other tissues. b. Exocrine glands produce hormones, while endocrine glands do not. c. Endocrine glands only affect cells in the immediate area, while exocrine glands do not. d. Endocrine glands secrete into the interstitial fluid, while exocrine glands release secretions into ducts. e. Exocrine glands secrete neurohormones, while endocrine glands do not.
A haploid cell is a cell
a. in which the genes are arranged haphazardly. b. containing only one copy of each chromosome. c. that has resulted from the process of mitosis. d. with twice the number of chromosomes of a diploid cell. e. None of the above
Which of the following proteins is required only for excision of phage lambda from a bacterial chromosome?
a. Cre b. Int c. IHF d. Xis e. Att