What are the benefits and challenges of an exoskeleton?
What will be an ideal response?
The chief benefit is that an exoskeleton provides good protection; the chief challenge is that it limits the animal's size and growth, and so it must be shed periodically.
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Which one of the following statements most accurately describes methylation?
A. Methyl groups are most often added to cytosines adjacent to guanine bases in or near the promoter sequence, increasing the probability of gene expression. B. Methyl groups are most often added to cytosines adjacent to guanine bases in or near the promoter sequence, decreasing the probability of gene expression. C. Methyl groups are most often added to adenine-thymine base pairs because they are held by only two hydrogen bonds, and this increases the probability of gene expression. D. Methyl groups are most often added to guanine-cytosine base pairs because they are held by three hydrogen bonds, and this decreases the probability of gene expression. E. Methyl groups are added to most bases in the promoter region of a specific gene so that RNA polymerase and its associated proteins will bind more efficiently.
Which of the following is smallest?
A) ribosome B) virus C) protein D) mitochondrion E) bacterium
The root apical meristem is surrounded and protected by a structure called the
a. endodermis. b. root cap. c. quiescent center. d. pericycle. e. root hairs.
At most companies, corporate social responsibility is still _____, and largely _____, to core business strategies.
A) essential; fundamental B) circumstantial; intentional C) incidental; supplemental D) supplemental; incidental