What posttranslational modification occurs on the protein CPEB to initiate mRNA translation?
A) ubiquitination
B) glycosylation
C) methylation
D) acetylation
E) phosphorylation
Answer: E
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Which of the following is not evidence that plants and the animals that eat them are locked in an evolutionary "arms race"?
A. R genes, instrumental in plant pathogen recognition, form one of the largest gene families in plants. B. Plants produce over 6000 alkaloids that act as chemical defense molecules. C. Plants produce over 10,000 terpenoid compounds. D. Plants in areas of high herbivory often produce low levels of defense compounds in their leaves. E. There are many specialist herbivores that are able to detoxify and in other ways avoid the chemical defenses produced by the plant they consume.
Climate has been proposed to play a role in the latitudinal diversity gradient. Specifically, some have hypothesized that
A. the warm climate of the tropics promotes high speciation rates. B. the warm climate of the tropics promotes niche diversification. C. relatively few species are able to adapt to the harsher, more variable climates of the high latitudes. D. the harsh, more variable climates of the high latitudes reduce speciation rates. E. none of these
The fluorochrome stain used to study a fungus is:
a. calcofluor white. b. acridine orange. c. auramine. d. immunofluorescence.
You are given two nucleic acids; one RNA and the other DNA. What are the main features to determine which is the DNA?
_____ DNA will have thymine instead of uracil in its nitrogenous bases. _____ DNA will have a double-stranded structure. _____ DNA will have ribose as the sugar in its backbone. _____ DNA will have uracil instead of thymine in its nitrogenous bases. _____ Adenine will be present in the DNA.