The general purpose of the synaptonemal complex is to __________
A. provide a link between homologous chromosomes in meiosis.
B. enable the reformation of the cell wall during cytokinesis.
C. separate the sister chromatids during anaphase.
D. independently assort the chromosomes during metaphase of meiosis.
E. None of the answers are correct.
A
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Phosphofructokinase (PFK) is an enzyme that converts fructose 6-phosphate to fructose 1,6-bisphosphate, by adding a phosphate group. This is the first committed step of the metabolic pathway of glycolysis, and thus it is very tightly regulated. AMP binds to PFK at a site distinct from the binding site for fructose 6-phosphate, and stimulates the formation of fructose 1,6-bisphosphate. ATP binds to PFK at a site distinct from the binding site for fructose 6-phosphate, and inhibits the formation of fructose 1,6-bisphosphate. There are other regulators of this enzyme as well. What is the role of AMP in this example?
A. Competitive inhibitor B. Noncompetitive inhibitor C. Allosteric inhibitor D. Allosteric activator E. Catalyst
Recent climate simulations suggest that angiosperms may have been necessary for the formation of tropical rainforests as we know them today
A. true B. false
The nodes on a cladogram represent
a. periods of extinction. b. derived characters. c. clades. d. common ancestors. e. exaptations
In Drosophila melanogaster, vestigial wings are caused by a recessive allele of a gene that is linked to a gene with a recessive allele that causes black body color
Morgan crossed black-bodied, normal-winged females and gray-bodied, vestigial-winged males. The F1 were all gray bodied, normal winged. The F1 females were crossed to homozygous recessive males to produce testcross progeny. Morgan calculated the map distance to be 17 map units. Which of the following is correct about the testcross progeny? A) black-bodied, normal-winged flies = 17% of the total B) black-bodied, normal-winged flies PLUS gray-bodied, vestigial-winged flies = 17% of the total C) gray-bodied, normal-winged flies PLUS black-bodied, vestigial-winged flies = 17% of the total D) black-bodied, vestigial-winged flies = 17% of the total