A carrier molecule is required for
A. osmosis and active transport.
B. active transport and facilitated diffusion.
C. osmosis and diffusion.
D. facilitated diffusion and endocytosis.
B. active transport and facilitated diffusion.
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Bacterial strains that have distinct antigenic properties are called ________.
Fill in the blank(s) with the appropriate word(s).
Which of the following are greenhouse gases? Check all that apply.
_____ water vapor _____ molecular oxygen _____ molecular nitrogen _____ methane _____ nitrous oxide
The phospholipids of plasma membranes have
a. a hydrophobic head and a hydrophilic tail. b. a hydrophobic head and a hydrophobic tail. c. a hydrophobic head and two hydrophobic tails. d. a hydrophilic head and two hydrophobic tails. e. a hydrophilic head and two hydrophilic tails.
Although most genetic sequence information is obtained from living species, it is sometimes possible to obtain DNA from small tissue samples of extinct species for use in constructing phylogenetic trees.
Answer the following statement true (T) or false (F)