Blood doping, practiced by many athletes involved in the Tour de France as well as other sports, involves the illegal use of drugs to
A) increase circulation.
B) increase the amount of oxygen carried in blood.
C) decrease the amount of carbon dioxide in blood.
D) elevate the rate of hemostasis.
E) increase red bone marrow production.
B
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Which type of microscope provides the greatest depth of field?
a. light b. scanning electron c. transmission electron
When blood calcium levels fall, ____
a. PTH secretion increases b. osteoblast activity increases c. osteoclast activity decreases d. growth hormone activity increases e. calcitonin secretion increases
Scientists may compare similar genes in different species and determine what percentage of base pairs is identical. From this, it can be estimated how long ago the two species shared a common ancestor. The validity of this conclusion depends on an
important assumption. This assumption is that: A) all living things use the same genetic code. B) both species belong to the same kingdom. C) the gene codes for a functional protein. D) mutations occur at a fairly constant rate in all evolutionary lines.
Using terms from the list below, fill in the blanks in the following brief description of the experiment with Streptococcus pneumoniae that identified which biological molecule carries heritable genetic information
Some terms may be used more than once. Cell-free extracts from S-strain cells of S. pneumoniae were fractionated to __________________ DNA, RNA, protein, and other cell components. Each fraction was then mixed with __________________ cells of S. pneumoniae. Its ability to change these into cells with __________________ properties resembling the __________________ cells was tested by injecting the mixture into mice. Only the fraction containing __________________ was able to __________________ the __________________ cells to __________________ (or __________________ ) cells that could kill mice. carbohydrate lipid R-strain DNA nonpathogenic RNA identify pathogenic S-strain label purify transform Fill in the blank(s) with correct word