If you wanted to prepare a 1:10,000 dilution of your sample and cannot measure out quantities of less than 1 mL, and have dilution blanks that can hold only 10 mL, how many dilution blanks will you need?

a. 2
b. 3
c. 4
d. 5

4.

Explanation:

The dilution process may be defined as the increasing of the solute concentration by mixing it with water or any other soluble reagents. The dilution is important to detect the bacterial growth.

The four blank is required to make the dilution of 1:10,000. The first blank contains 10⁰ or 1 ml and takes out 10 ml and 90 ml will remain in dilution. This results in 1: 10 ml dilution. Then further subsequent dilution from the second blank results 1:100 ml and tbird dilution contains blanks with 1:100 dilution. The fourth blanks dilution results in 1: 10,000.

Thus, the correct answer is option (c).

voluntary muscles are controlled by the cerebellum.

1. amino acid refers to the fundamental building block of proteins, comprising of an amino group and a carboxyl group.

2. catalyst refers to any substance, which increases the rate of chemical reaction without being used up in the reaction.

3. a complex molecule containing he genetic code is dna or deoxyribonucleic acid.

4. an enzyme refers to a molecule of protein, which is unique in accelerating up a particular chemical reaction in the biological systems.

5. nucleic acid refers to an sequence of sugars, phosphates, and nitrogenous bases, for example, dna and rna.

6. a protein refers to a large, composite organic molecule comprising of a huge number of amino acids associated together with the of peptide bonds.

7. rna refers to a nucleic acid that takes part in the production of proteins.

8. substrate refers to a compound, which takes part in a chemical reaction, and is chemically modified by the reaction.