Which of the following types of organisms contain sphingomyelin in cell membranes?
A) prokaryotes
B) algae
C) animals
D) yeast
E) plants
Answer: C
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Coliforms
A. are an informal grouping of enterics. B. ferment lactose. C. include E. coli. D. are used as indicators of fecal contamination. E. All of the choices are correct.
A double-stranded, enveloped DNA virus that contains reverse transcriptase belongs to which family?
A. Hepadnaviridae B. Poxviridae C. Picornaviridae D. Retroviridae E. Rhabdoviridae
The empty center of a single pass transmembrane protein provides a channel for the transport of ions.
a. true b. false
Potassium has one electron in its fourth shell, and chlorine has seven electrons in its third shell. Which of the following is most likely to be true?
A) The two atoms will share the electron unequally in a polar covalent bond. B) The two atoms will share an electron equally in a nonpolar covalent bond. C) Chlorine will give an electron to potassium to form an ionic bond. D) Potassium will give an electron to chlorine to form an ionic bond.