The formation of a bivalent during meiosis ensures that _______
(a) one chromatid from the mother and one chromatid from the father will segregate together during meiosis I.
(b) all four sister chromatids remain together until the cell is ready to divide.
(c) recombination will occur between identical sister chromatids.
(d) the sex chromosomes, which are not identical, will line up separately at the metaphase plate during meiosis I.
Choice (b) is correct. Both chromatids from a single parent will segregate together during meiosis I [choice (a)]. Recombination occurs between nonidentical sister chromatids [choice (c)]. The sex chromosomes will come together to form a bivalent, despite not being identical [choice (d)].
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Some regions of chromosomes remain highly condensed, tightly coiled, and untranscribed throughout the cell cycle. These regions are referred to as
A. noncoding DNA. B. single sequence repeats. C. constitutive heterchromatin. D. short interspersed elements. E. transposable elements.
Substitution of one base pair for another can result in a __________ mutation that results in the
conversion of an amino acid specifying codon to a termination codon. a. nonsense b. frameshift c. chromosomal d. missense e. silent
Pyrite (FeS2) is common in bituminous coal and metal ores and is a critical component of the microbial leaching of ores and acid mine drainage
Indicate whether the statement is true or false.
The vital capacity is indicated by
a. A + D. b. A + D + E. c. C + E. d. A + B + D. e. A + C + D.