Which of the following is a fat-soluble vitamin?
a. vitamin C
b. vitamin B12
c. vitamin E
d. vitamin B3
c. vitamin E
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Phosphorylation cascades involving a series of protein kinases are useful for cellular signal transduction because they _____
A) are species specific B) always lead to the same cellular response C) amplify the original signal many times D) counter the harmful effects of phosphatases E) use a small and fixed number of molecules
When the light reactions take place in chloroplasts and the Calvin cycle occurs in bundlesheath
cells, this is a
a. physical separation. b. seasonal separation. c. temporal separation. d. transpiration
Which of the following is NOT an example of
the results of mitosis? a. a pair of identical twins b. a group of rooted plant cuttings from a single plant c. the cells produced by the asexual reproduction of a single-celled organism d. production of a gamete e. healing of a wound
Errors sometimes occur when DNA duplicates itself. Why might that be a good thing?
a) most errors are, in fact, good for the organism in which they occur b) the rebuilding process proceeds much more quickly when a few errors occur c) errors in DNA replication can never be a good thing d) the DNA replication process becomes more fine-tuned, the more errors it makes e) new genes can enter the population and be acted upon by evolution