Using a 1:20 Dilution of Semen,a Student Counts 70 Sperm

question 49

Multiple Choice

Using a 1:20 dilution of semen,a student counts 70 sperm in the five RBC squares on one side of the Neubauer hemocytometer and 82 sperm on the other side.The student should:

• A) Use a new chamber
• B) Report the count as 70 million/mL
• C) Repeat the count
• D) Load only one side of the counting chamber

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Definitions:

Covalent Disulfide Bonds

Strong chemical bonds formed between two sulfur atoms within or between polypeptide chains, important for the stability and folding of proteins.

Hydrophobic Interactions

Non-covalent bonding interactions that occur between nonpolar molecules or molecular regions, driving them together in aqueous environments.

Hydrophobic Molecules

Molecules that repel water and tend not to dissolve in it, often nonpolar substances like oils.

Hydrophilic Molecules

Molecules that are attracted to water and can dissolve in it easily, due to their polar nature.