-ray crystallography revealed several important features of the shape of DNA. Which one of the
following facts about DNA was NOT revealed by X-ray crystallography?
A. The shape of the molecule is helical.
B. The amount of purine bases equals the amount of pyrimidine bases.
C. The molecule has a constant diameter.
D. The phosphate groups are located on the outside.
E. All of these were revealed by X-ray crystallography.
B
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Epigenetic inheritance
A. only refers to autosomal genes. B. only affects female offspring. C. only affects male offspring. D. can result in the expression of different alleles in different generations. E. only refers to X inactivation.
Cells of the immune system are not found in which of the following tissues in the gastrointestinal tract?
A. Peyer's patches B. Tonsils and adenoids C. Appendix D. Tooth enamel
The net diffusion of water across a selectively permeable membrane is
a. facilitated diffusion. b. active transport. c. laminar flow. d. carrier moderated diffusion. e. osmosis
the enzyme that functions in the small intestine to digest carbohydrates is pancreatic
What will be an ideal response?