What is one reason that RNA viruses and retroviruses have such a high rate of mutation?
A. because RNA replication is much more
prone to mistakes
B. because RNA viruses and retroviruses
initially cause mutations during replication
C. because RNA is more fragile than DNA
and therefore more likely to be damaged
D. because they lack a proofreading
mechanism
E. because RNA is more fragile than DNA
and because viral polymerases lack a
proofreading mechanism.
E
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____ is a form of learning typically seen in young animals and involves acquiring specific behaviors in response to key experiences during critical times called ____
Fill in the blank with the appropriate word.
A predictable effect of genetic drift in a small population is an increase in _____
a. mutations b. dominant alleles c. recessive alleles d. genetic variation e. homozygosity
Eukaryotic chromosomes contain two general domains that relate to the degree of condensation. These two regions are ________
A) void of introns B) called heterochromatin and euchromatin C) separated by large stretches of repetitive DNA D) each void of typical protein-coding sequences of DNA E) uniform in the genetic information they contain
Which of the following are accurate descriptions of the properties of water? (select all that apply)
A. Water molecules are polar, and thus dissolve other polar or ionic substances. B. Water molecules are nonadhesive, tending to repel each other forcefully, resulting in a low surface tension. Water molecules are nonadhesive, tending to repel each other forcefully, resulting in a low surface tension. C. Water shrinks when it crystallizes, and ice is more dense than liquid water. D. Water's high heat of vaporization makes evaporation an effective way for many organisms to shed excess heat.