Which of the following statements about nucleosomes is false?
A. Nucleosomes convert a DNA molecule into a chromatin thread about one-third the length of the initial DNA.
B. Nucleosomes are found only in mitotic chromosomes.
C. Nucleosomes can be seen in the electron microscope.
D. Nucleosomes represent the first and most fundamental level of chromatin packing.
E. A nucleosome consists of DNA wrapped around eight histone proteins, plus a short segment of linker DNA.
Ans: B. Nucleosomes are found only in mitotic chromosomes.
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Eukaryotic telomeres replicate differently than the rest of the chromosome. This is a consequence of which of the following?
A) the evolution of telomerase enzyme B) DNA polymerase that cannot replicate the leading strand template to its end C) gaps left at the end of the lagging strand D) gaps left at the end of the lagging strand because of the need for a primer E) the "no ends" of a circular chromosome
How does the effect of a sudden drop in predator population compare to the effect of a sudden drop in prey population? a. A sudden drop in predator population results in an increase in prey population,while a sudden drop in the prey population results in a sudden drop in thepredator population
b. A sudden drop in the predator population results in a corresponding drop in theprey population, while a sudden drop in the prey population results in a suddendrop in the predator population. c. A sudden drop in the predator population does not affect prey populationnumbers, but a sudden drop in the prey population will result in a sudden drop inthe predator population. d. A sudden drop in the predator population results in a corresponding suddenincrease in the prey population, but a sudden drop in the prey population doesnot affect the predator population.
While touring the ancient Egypt exhibit at the local history museum, you learn that ancient Egyptians would slash figs in order to stimulate ripening. Based on your knowledge of plant hormones you hypothesize that wounding the figs must release:
A. ethylene. B. gibberellin. C. abscisic acid. D. cytokinin. E. indoleacetic acid.
Enzymes called ____ form breaks in the DNA molecules to prevent the formation of knots in the DNA helix during
replication. a. topoisomerases b. single-strand binding proteins c. DNA polymerases d. RNA polymerases e. DNA ligases