The plasma membrane is composed of ____
a. water and salts
b. proteins
c. nucleic acids
d. primarily phospholipids
e. proteins and carbohydrates
ANSWER: d
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In the system of binomial nomenclature, species are assigned a two-part name: the first part is the ____ and the second
part is the ____name.
a. species; genus b. genus; species c. species; family d. genus; family e. family; species
Which system defends against infections and cancer?
a. endocrine b. circulatory c. respiratory d. lymphatic e. urinary
DNA replication occurs as a part of the cell cycle. Which best summarizes why DNA replication is considered an essential part of the cell cycle?
A) It controls the production of enzymes in the cell. B) It regulates the timing of each step of the cell cycle. C) It allows each cell division to produce cells with greater amounts of genetic material. D) It allows individual cells to divide into two cells each with complete genetic information.
Passive transport across a membrane refers to
a. transport into the interior of a cell. b. transport out of a cell. c. transport in the energetically favorable direction. d. simple diffusion across membranes, without the help of proteins such as channels or carriers.