Choose the answer that best fits the following statement: Cholesterol is an essential component of biological membranes

Although it is much smaller than the typical phospholipids and glycolipids in the membrane, it is a(n) _________________ molecule, having both hydrophilic and hydrophobic regions.
(a) polar
(b) oxygen-containing
(c) hydrophobic
(d) amphipathic


(d)

Biology & Microbiology

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Nucleic acids have a definite polarity, or directionality. Stated another way, one end of the molecule is different from the other end. How are these ends described?

A) One end has a hydroxyl group on the 2 carbon; the other end has a hydrogen atom on the 2 carbon. B) One end contains a nitrogenous base; the other end lacks it. C) One end has an unlinked 3 carbon; the other end has an unlinked 5 carbon. D) One end has one phosphate group; the other end has two phosphate groups.

Biology & Microbiology

Which functional group acts as an organic base?

a. carbonyl group b. hydroxyl group c. phosphate group d. amino group e. carboxyl group

Biology & Microbiology

Which of the following is not true of

cladistics? a. It involves making hypothesis about the evolutionary relationship between clades. b. It is a precise science. c. It can lead to a cladogram. d. It may involve parsimony analysis. e. It may use outgroups to ‘root’ the tree

Biology & Microbiology

If someone has an iron deficiency in the diet, which part of the blood would this mainly impact?

A) red blood cells B) white blood cells C) platelets D) plasma proteins

Biology & Microbiology