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.
D
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A. Pure B. Mixed C. Axenic D. Both axenic and mixed are correct. E. Both axenic and pure are correct.
Choose the bone or set of bones that belong to the appendicular portion of the human skeleton.
A. vertebral column B. pelvic girdle C. ribs D. skull
What is the physical basis for the "mitotic clock", which controls the number of divisions one cell can undertake?
What will be an ideal response?
According to the accompanying figure, which of the following are large enough to see in the light microscope?
 A) atoms B) proteins C) viruses D) mitochondria