Which protein are microtubules assembled from?
a. tubulins
b. actins
c. myosins
d. keratins
Ans: a. tubulins
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Facilitated diffusion is specific. This means ____
a. a specific protein will transport certain polar or charged molecules but not others b. that only one specific integral protein per membrane is involved in facilitated diffusion c. that the energy molecule ATP is specifically required for transport d. only specific hydrophobic molecules can be transported e. that transport of molecules occurs only in specific cells
Which of the following processes can be used to bring nutrients into a cell against a concentration gradient?
A. Passive diffusion B. Active transport C. Facilitated diffusion D. Active transport and facilitated diffusion
The equalization of pressures between the ear and throat is made possible by the
a. pharynx. b. Eustachian tube. c. cupula. d. semicircular canals. e. round window.
Which is NOT a benefit of the understanding of evolution to understanding the field of biology?
A) Understanding evolution helps us to understand molecules. B) Understanding evolution helps us to analyze ecosystems. C) Understanding evolution helps advance biotechnology and medicine. D) Understanding evolution helps us to understand why stars and galaxies change over time.