Which statement about van der Waal interactions is false?
a. They are very strong.
b. They are attractive forces.
c. They operate over very short distances.
d. They form between nonpolar molecules.
e. They involve transient regions of positive and negative charges.
a
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Why do some biologists use the name Craniata instead of the name Vertebrata?
A. Hagfish have a bony cranium but no vertebrae. B. Hagfish are too different from Cephalochordates to be included in that group. C. Hagfish are not represented by very many species, so cannot be given their own taxonomic grouping. D. Hagfish are understudied, so can only be grouped with other taxa based on their lack of characters.
The first complete nonviral genome sequenced was that of
A) Escherichia coli. B) Methanococcus. C) Saccharomyces cerevisiae. D) the human mitochondrion. E) Mus musculus.
The junctions between animal cells that allow the free passage of molecules smaller than approximately 1,000 daltons are called
a. tight junctions. b. plasmodesmata. c. gap junctions. d. hemidesmosomes.
Which of the following is not a chemical modification commonly found on core histone N-terminal tails?
(a) methylation (b) hydroxylation (c) phosphorylation (d) acetylation