A helix is one possible ____ structure of ____.
A. primary; proteins
B. primary; carbohydrates
C. primary; lipids
D. secondary; nucleic acids
E. tertiary; proteins
Answer: D
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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.
In the general population, 1 in 300 individuals is a carrier for Tay-Sachs disease, while 1 in 30 individuals of Ashkenazi Jew descent are carriers
Tay-Sachs also affects 1 in 30 individuals with French-Canadian ancestry, although two completely unique mutations are responsible for the Ashkenazi and French-Canadian mutations. What are the chances of two individuals who are carriers having a child with Tay-Sachs if a. both individuals are not of Ashkenazi or French-Canadian descent? b. one individual is of Ashkenazi descent and one is not? c. both individuals are of Ashkenazi descent?
What is the usual size range of viruses?
A. 30 to 300 nanometers B. 20 to 300 micrometers C. 20 to 300 millimeters D. 20 to 300 centimeters
Compare and contrast the steps of viral multiplication cycles in bacteriophages and animal viruses.
What will be an ideal response?