Four of the five events listed below are related by
a common phase of mitosis. Select the exception.
a. beginning of microtubule assembly outside
the nucleus
b. division of centromere
c. disappearance of nucleolus
d. disappearance of nuclear membrane
e. shortening and condensation of chromosomes
make them more visible
Answer: b
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Diversity often decreases during the later stages of succession
Indicate whether the statement is true or false
In eukaryotes a series of ________ residues are added to the 3' end of an RNA molecule as part of the posttranscriptional processing used to produce functional mRNA.
A. guanine B. cytosine C. adenine D. uracil
In the 1920s, two German embryologists, Hans Spemann and Hilde Mangold, demonstrated that a small patch of cells, called the dorsal lip of the blastopore, would
A) form the chorion. B) lack the genes necessary to develop the embryo. C) become the digestive tract. D) induce the surrounding cells to differentiate. E) become the neural tube.
Leptospirosis has all the following characteristics except
A. it can be transmitted by animal bites. B. humans acquire it by contact with abraded skin or mucous membranes. C. the pathogen is a spirochete. D. it infects kidneys, liver, brain, and eyes. E. it most common in cattle, horses, pigs, and dogs.