When cells are not responding to normal controls over growth and division, they form a tissue mass known as a
a. metastasis.
b. malignancy.
c. tumor.
d. carcinogen.
e. nucleosome.
ANSWER: c
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The formation of the bivalent during meiosis
A. is required for the pairing of homologous chromosomes. B. contributes to the genetic diversity of a species. C. ensures that the resulting haploid cells will have the same combination of homologous chromosomes as the original diploid cell. D. aids the alignment of sister chromatids in a single row along the metaphase plate. E. occurs during meiosis I and meiosis II.
In proteins, nitrogen bases link covalently to ribose in DNA
Indicate whether the statement is true or false.
A solute passively diffuses through a transport
protein out of the cell. What is the tonicity of the fluid inside the cell?
a. hypertonic b. hypotonic c. isotonic d. none of these e. more than one of these
Which statement correctly describes human chromosomes?
a. The haploid number is 22 b. Human gametes end up with two of each type of 23 chromosomes. c. There are 42 pairs of chromosomes. d. The diploid number is 46. e. Human gametes end up with one of each type of 22 chromosomes.