What is the basic structure of the histone octamer of a nucleosome?
What will be an ideal response?
Ans: The histone proteins H3 and H4 form a tetramer known as H32-H42. The histone H2A and H2B form a dimer (H2A-H2B). Two of these dimers are complexed with the tetramer to form the core nucleosome octamer.
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The rate of exchange of carbon between the atmosphere and the oceans represents a carbon:
A. sink. B. reservoir. C. biomass. D. precipitation. E. flux.
What are the base-pairing rules for DNA?
a. A-G, T-C b. A-C, T-G c. A-U, C-G d. A-T, G-C e. A-T, G-U
Which of the following is not a function of root hairs? a. Increase the uptake of dissolved oxygen
b. Increase the uptake of carbon dioxide. c. Increase the uptake of mineral ions. d. Increase the uptake of soil water. e. Increase surface area of the root system.
An animal’s fight-or-flight response is controlled by which of the following?
a. sympathetic nervous system b. frontal lobe c. parasympathetic nervous system d. occipital lobe