Which of the following junctions is most abundant in tissues such as skin that are required to resist significant mechanical stress?
A) gap junctions
B) desmosomes
C) focal adhesions
D) tight junctions
E) All are abundant in tissues resisting stress.
Answer: B
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Motor proteins require energy in the form of ATP. ATP hydrolysis results in a conformational change that allows the protein to move along microtubular tracks (pathways). What structural component of the motor protein contains the ATP binding site
and, therefore, changes shape to enable movement? A) the portion of the molecule that binds to the vesicle being transported B) the stalk C) the portion of the molecule that binds to the microtubular track along which the vesicle is being transported D) a location midway between the vesicle binding site and the portion of the molecule that binds to microtubular tracks
High-efficiency natural transformation
A) is common in Bacteria and Archaea. B) requires specialized DNA uptake, DNA binding, and integration proteins. C) is only common in Archaea. D) usually involves plasmids.
Older roots can become extremely thick and woody as ________ accumulates during secondary growth.
A. Secondary phloem B. Sapwood C. Primary xylem D. Secondary xylem E. Primary phloem
The gain of electrons by a molecule is called
a. inhibition b. entropy c. oxidation d. reduction