The chemical composition of the prokaryotic cell wall is:
a. carbohydrates and protein
b. phospholipids and protein
c. carbohydrates and lipid
d. water and compatible solutes
e. A and can be D, depending on if its a halophile
Answer: a. carbohydrates and protein
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Functional traits can be shared between organisms with divergent SSU rRNA sequences because
A) functional traits may be lost by different lineages over time. B) functional traits may evolve independently in different lineages over time. C) horizontal gene transfer can result in the transfer of genes between divergent lineages. D) functional traits may evolve independently, be shared through horizontal gene transfer, or be lost in divergent lineages.
The dinosaurs are thought to have gone extinct due to an asteroid strike. How would this impact on
population growth be described? What will be an ideal response?
Dietary treatment of galactosemia
A. need not begin until one or two months after birth. B. requires a low protein diet. C. can be discontinued by the age 10?12. D. completely eliminates symptoms of the disease. E. none of these.
Transmembrane proteins can span the lipid bilayer as
a. alpha-helices. b. beta-barrels. c. Both a and b d. None of the above