Alternative RNA splicing _____

A) is a mechanism for increasing the rate of transcription
B) can allow the production of proteins of different sizes and functions from a single mRNA
C) can allow the production of similar proteins from different RNAs
D) increases the rate of transcription
E) is due to the presence or absence of particular snRNPs


Answer: B

Biology & Microbiology

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Nondisjunction can result in _____

a. polyploidy b. aneuploidy c. crossing over d. pleiotropy

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Although extinction is a natural process and is ongoing, it is likely we are in a time of ____, an event in which many

different kinds of organisms become extinct in a relatively short period.

a. mass extinction b. genetic mutation c. geologic catastrophe d. loss of megafauna e. birth of new species

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Eukaryotic motile cilia and flagella have similar structures but vary in number, length, and function. For each of the following, compare/contrast cilia and flagella

a. number present per cell b. length of appendage c. direction of force generated relative to the direction of the appendage d. function in unicellular and multicellular eukaryotes e. motion analogy What will be an ideal response?

Biology & Microbiology

Zebra mussels were introduced into Lake St. Clair around 1988

The table lists the population densities (in grams dry weight per square meter of lake bottom) of native unionid mussels and exotic zebra mussels in the lake before and after this introduction. Both groups feed by filtering small particles from the water. Based on the information given, which of the following best describes the likely relationship between zebra mussels and unionids? Year Unionids Zebra mussels 1986 4.5 0.0 1990 3.7 4.6 1992 1.3 3.4 1994 0.1 3.2 A) Zebra mussels and unionids have no effect on each other. B) Zebra mussels exert a density-independent control on unionid populations. C) Zebra mussels exert a density-dependent control on unionid populations. D) Unionids exert a density-dependent control on zebra mussel populations. E) Unionids exert a density-independent control on zebra mussel populations.

Biology & Microbiology