A sperm count any lower than ________ million sperm per mL of semen is usually associated with infertility (sterility)
A) 250 to 500 B) 100 to 200 C) 50 to 100 D) 200 to 250 E) 20 to 25
E
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Blood has been described as an example of a suspension, and soda has been described as a solution. Define these two categories of mixtures and provide different examples of each type
In the examples you provide, explain the molecular properties (approximate size, polarity) of the substances that mix with water.
The genetic code is the correspondence between DNA sequence and amino acid sequence of a protein.
Answer the following statement true (T) or false (F)
Why would removal of the thymus compromise humoral immunity?
A. Helper T cells mature in the thymus and are needed to activate B cells and humoral immunity. B. B cells responsible for humoral immunity mature in the thymus. C. Once activated, B cells must travel to the thymus in order to produce antibodies. D. Most mature B cells reside in the thymus, so removing the thymus removes the majority of the body's B cells.
Humans require vitamins in their diets because these nutrients
A. bond with minerals. B. provide energy. C. are broken down by catabolic reactions. D. act as coenzymes.