What is true about new nucleosome formation during DNA replication?
A) Nucleosomes will be composed of different combinations of H3/H4 tetramers and H2A/H2B that are either newly synthesized or were from previous histone octamers.
B) Nucleosomes will be composed of different combinations of H3/H2A tetramers and H4/H2B that are either newly synthesized or were from previous histone octamers.
C) One DNA strand will have newly synthesized octamers and the other will have previously synthesized octamers.
D) Nucleosomes will be composed of different combinations of H2A/H2B/H3/H4 tetramers that are either newly synthesized or were from previous histone octamers.
A) Nucleosomes will be composed of different combinations of H3/H4 tetramers and H2A/H2B that are either newly synthesized or were from previous histone octamers.
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Indicators that a headache can be the presenting symptom of a serious illness and may require neuroimaging include all of the following except:
A. headaches that occur periodically in clusters. B. increasing frequency and severity of headaches. C. headache causing confusion, dizziness, and/or lack of coordination. D. headache causing awakening from sleep.
In a tropical forest some leaves are dark green
and some are light green. In a population of caterpillars, homozygous dominant dark green caterpillars thrive eating the green foliage; homozygous recessive light green caterpillars thrive eating light green foliage; heterozygous caterpillars of an intermediate color green are easily seen by birds and eaten, thus there frequency is far less than the dominants or recessives. This is an example of ___ selection.
a. directional b. stabilizing c. disruptive d. frequent e. mutational
In the case of temperature regulation, an example of an effector is
a. a receptor in the brain. b. a center in the brain. c. a shivering skeletal muscle. d. none of the above.
When comparing viruses and bacteria, which one of the following statements is CORRECT?
A) Viruses are larger than bacteria. B) Viruses are pathogens; bacteria are decomposers. C) Viruses have membrane-bound organelles; bacteria do not have membrane-bound organelles. D) Viruses and bacteria are both able to reproduce on their own. E) Viruses and bacteria both contain genetic material.