Which of the following is not true of combinatorial control of the yeast mating-type?
A. Mcm1 and ?1 combine to activate ?-specific genes in haploid ? cells.
B. Mcm1 and a1 combine to repress ?-specific genes in haploid a cells.
C. Mcm1 and ?2 combine to repress a-specific genes in haploid ? cells.
D. Mcm1 and ?2 combine to repress a-specific genes in diploid cells.
B
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The sex of birds, some insects, and other organisms is determined by a ZW chromosomal arrangement in which the males have like sex chromosomes (ZZ) and females are ZW (similar to XY in humans)
Assume that a recessive lethal allele on the Z chromosome causes death of an embryo in birds. What sex ratio would result in the offspring if a cross were made between a male heterozygous for the lethal allele and a normal female? A) 4:1 male to female B) 1:2 male to female C) 1:1 male to female D) 2:1 male to female E) 3:1 male to female
During mitosis, which of the following normally occurs?
a. Homologous chromosomes pair. b. Replicated chromosomes line up on the equatorial plate. c. Tetrads form. d. Unreplicated chromosomes become oriented in the center of the cell. e. Maternal and paternal chromatids pair.
Aspirin and ibuprofen both _____
A) inhibit the synthesis of prostaglandins B) inhibit the release of nitric oxide, a potent vasodilator C) activate the paracrine signaling pathways that form blood clots D) stimulate vasoconstriction in the kidneys
These two molecules are structural isomers. What is the difference between them?
A) the number of carbon atoms
B) the number of hydrogen atoms
C) the location of a double-bonded oxygen atom
D) Only one of them has a double bond between carbon atoms.