For each of the following sentences, choose one of the options enclosed in square brackets to make a correct statement about nucleosomes
A. Nucleosomes are present in [prokaryotic/eukaryotic] chromosomes, but not in [prokaryotic/eukaryotic] chromosomes.
B. A nucleosome contains two molecules each of histones [H1 and H2A/H2A and H2B] as well as of histones H3 and H4.
C. A nucleosome core particle contains a core of histone with DNA wrapped around it approximately [twice/three times/four times].
D. Nucleosomes are aided in their formation by the high proportion of [acidic/basic/polar] amino acids in histone proteins.
E. Nucleosome formation compacts the DNA into approximately [one-third/one-hundredth/one-thousandth] of its original length.
A. Nucleosomes are present in eukaryotic chromosomes, but not in prokaryotic chromosomes.
B. A nucleosome contains two molecules each of histones H2A and H2B as well as of histones H3 and H4.
C. A nucleosome core particle contains a core of histone with DNA wrapped around it approximately twice.
D. Nucleosomes are aided in their formation by the high proportion of basic amino acids in histone proteins.
E. Nucleosome formation compacts DNA into approximately one-third of its original length.
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communities, than in natural communities with greater species richness. a. less common b. more common c. equally common d. most easily prevented e. rarely occur
Which of the following is true concerning the dodo bird?
a. The greatest effect by humans on the dodo bird was because Dutch sailors ate them b. The dodo bird went extinct in the twentieth century due to industrial pollution. c. Humans were not involved in their fate. d. Destruction of nests and habitat by animals that accompanied the sailors caused the greatest effect on dodo bird populations.
Which of the following statements regarding breathing and circulation in insects is false?
A) Insects lose very little water by using a tracheal system to breathe. B) The tracheal system of insects consists of a series of branching air tubes that extend from the surface to deep inside the body. C) Terrestrial animals such as insects spend much more energy than aquatic animals to ventilate their respiratory surfaces. D) The circulatory system of insects is not involved in transporting oxygen.
Which of the following is a reactant or product during the process of photosynthesis?
a. oxygen b. FADH 2 c. NADH d. pyruvate