At what point during the cell cycle do chromosomes decondense into chromatin?
a. at the end of telophase
b. at the beginning of metaphase
c. at the beginning of interphase
d. at the end of interphase
Answer: a. at the end of telophase
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When RNA polymerase catalyzes the addition of a nucleotide to a growing mRNA chain, a byproduct of this reaction is
A. pyrophosphate. B. water. C. orthophosphate. D. phosphate.
The Cenozoic era, during which the diversity of animals living today arose, has extended from 65 mya to the present. This is approximately ___ of the geologic timescale.
A. 4% B. 15% C. 1.5% D. None of the answer choices is correct. E. 7%
Which type of growth curve is pictured for the accompanying photo of a desert shrub?
a. type II b. logistic c. type I d. exponential e. type III
Which of the following human genetic conditions is missing a chromosome?
A) XXXX syndrome B) Down's syndrome C) Turner syndrome D) Jacob syndrome E) Klinefelter syndrome