Bacteriophages are
a. bacteria.
b. prions.
c. viruses.
d. cellular components.
e. protistans.
c
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According to the acid-growth hypothesis, auxin causes increased acidity in cell walls, which then activates ____ that
disrupt(s) bonds between cellulose microfibrils, allowing cell expansion.
a. a membrane potential b. AUX1 transporters c. proteins called expansins d. an mRNA e. K+ ions
What organ(s) are more likely to be affected by teratogen exposure in the 16th week?
1.External genitals 2.Heart 3.Palate 4.Upper limbsA polysaccharide that is composed of modified glucose subunits and that is found in the exoskeletons of insects and crustaceans is known as:
A. glycogen B. starch C. amylose D. chitin
Channels form pores through which molecules of appropriate size and charge can cross a membrane, whereas carrier proteins
a. actively transport molecules. b. selectively bind the molecule to be transported, change configuration, and release it on the other side. c. require ATP. d. transport a molecule against its concentration gradient.