Histones that are tightly wound by DNA and are the basic unit of chromatin are called

A. facilitators sites.
B. operons.
C. repressor genes.
D. protein clusters.
E. nucleosomes.


Answer: E

Biology & Microbiology

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You have just discovered an organism that lives in extremely cold environments. Which of the following would you predict to be true about the phospholipids in its membranes, compared to phospholipids in the membranes of organisms

that live in warmer environments? A) The membrane phospholipids of cold-adapted organisms will have longer hydrocarbon tails. B) The membrane phospholipids of cold-adapted organisms will have more saturated hydrocarbon tails. C) The membrane phospholipids of cold-adapted organisms will have more unsaturated hydrocarbon tails.

Biology & Microbiology

Why is there a need to produce Okazaki fragments on the lagging strand, but not on the leading strand of DNA?

A. The two parental strands of DNA are antiparallel and DNA polymerase makes DNA in the 5? to 3? direction only. B. It is substantially more efficient to make several shorter strands rather than one longer strand of DNA. C. There lacks enough cellular DNA ligase for bonding Okazaki fragments together if they were produced from both parental strands. D. By having one leading strand and one lagging strand the cell can limit the amount of DNA polymerase used for chromosomal replication. E. It is faster to make several smaller fragments than one larger fragment.

Biology & Microbiology

Which of the following is an example of a positive feedback loop?

A) A hummingbird maintaining a constant internal body temperature B) Stress altering the normal menstrual cycle, which delays menstruation, thereby causing more stress C) A person altering her breathing rate to keep blood pH between 7.35 and 7.45 D) The kidney retaining water when the organism becomes dehydrated

Biology & Microbiology

The use of lysozyme during the preparation of cheeses and wines is effective in reducing the numbers of

A. fungi. B. viruses. C. bacteria. D. prions. E. all microbes.

Biology & Microbiology