Besides lipid-soluble molecules, what other substances may freely cross the phospholipid bilayers?
a. glucose
b. sodium ions
c. enzymes
d. oxygen
Answer: d. oxygen
Biology & Microbiology
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Organs strung together functionally and usually structurally form
a. organs. b. systems. c. tissues. d. organelles.
Biology & Microbiology
In DNA cloning, __________ cut DNA into pieces.
Fill in the blank(s) with the appropriate word(s).
Biology & Microbiology
The proper order of embryonic development is
A. morula-cleavage-blastula-gastrula. B. gastrula-cleavage-blastula-morula. C. cleavage-morula-blastula-gastrula. D. blastula-cleavage-morula-gastrula.
Biology & Microbiology
A hypothesis is
A) the same as a theory. B) a proposed explanation for a set of observations. C) an explanatory idea that is broad in scope and supported by a large body of evidence. D) a widely accepted idea about a phenomenon.
Biology & Microbiology