In the living cell, histone proteins pack DNA into a repeating array of DNA-protein particles called what?
a. beads on a string
b. euchromatin
c. octamers
d. nucleosomes
e. heterochromatin
Ans: d. nucleosomes
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The sex ratio of human senior citizens (>65 years) is
A) skewed toward females. B) skewed toward males. C) 1:1. D) the same as birds'.
Overproduction, variation, limits on population growth, and differential reproductive success are
components of: a. evolution by natural selection. b. evolution by inheritance of acquired characteristics. c. punctuated equilibrium. d. genetic inheritance. e. gradualism
Streptococcus pyogenes causes all of the following diseases except
A. strep throat B. scarlet fever C. pneumococcal pneumonia D. glomerulitis E. All of the choices are correct
What part of the neuron is responsible for most of the "house-keeping" tasks of the cell, including protein synthesis?
A. Dendrite B. Synapse C. Soma D. Axon E. Myelin