The phase of the cell cycle that varies most in duration in various cell types is
A) M.
B) G1.
C) S.
D) G2.
E) both choices A and B
B) G1.
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Amplification is an important characteristic of signal transduction pathways involving surface receptors. What is
amplification and how is it accomplished in the cell?
What will be an ideal response?At what level of organization does life begin?
a. digestive system b. cell c. molecule (water) d. molecule (DNA) e. population
Which of the following represents an early stage in primary succession?
a. pine trees b. moss and lichens on bare rock c. weedy annual plants in an open field
d. climax species in succession e. alder, cottonwood, and willow thickets
In an experiment designed to analyze the mRNAs present in a cell at a given time in the life cycle, it was found that about 50% of the mRNAs are of one type, less than 20% represent eight other mRNAs, and the rest consist of several thousand
different mRNAs. What does this information indicate? A) Only the mRNA expressed at the highest level is of any importance to this cell type. B) The pattern of expression of the low-level mRNAs is what makes the cell type unique. C) The low-level expressed genes are from organelles. D) Those genes expressed at a low level are likely to be "housekeeping" genes found in many cell types. E) The genes most specific to this cell type and life stage are the 8 found at an intermediate level.