In regions of a chromosome that encode highly structured RNA molecules, what sequence characteristics would you expect to find?
A. an abundance of pyrimidines, which play an important role in three-dimensional folding of RNA
B. an abundance of uracil, which plays an important role in three-dimensional folding of RNA.
C. multiple short segments capable of base pairing with adjacent or distant regions of the sequence.
D. heavy methylation of these gene sequences, preventing their expression
E. very little in the way of sequences that can form double-stranded helices
C
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Which statement about the Hershey-Chase experiment is false?
A. DNA was labeled with radioactive phosphorus. B. Protein was labeled with radioactive sulfur. C. The virus-infected bacteria contained radioactive phosphorus. D. The virus-infected bacteria contained radioactive sulfur.
Ribosomes are made up of:
A. protein and RNA. B. only protein molecules. C. only RNA molecules. D. DNA and RNA. E. only DNA molecules.
An animal digestive tract that consists of two openings (a mouth and anus) is called an
A) excretory system. B) alimentary canal. C) intestine. D) avian (bird) crop.
Which of the following cytokines act as a signal between leukocytes?
A) growth factors B) interferons C) interleukins D) tumor necrosis factors E) chemokines