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Escherichia cell is plated on nutrient agar plates that each contain a different type of antibiotic. The shaded area represents growth of the bacteria. Which of the following plates contains bacteria that were most resistant to the antibiotic

A. A

B. B

C. C

D. D

Answer Explanation:

This is the plate with the most growth despite the presence of antibiotic cover.

Therefore, the Correct Answer is C.

Q #1: Which of the following substances is excreted by sweat glands in response to the breakdown of proteins and the formation of ammonia?

A. Sebum

B. Water

C. Lysozymes

D. Urea

Answer Explanation

Urea is a nitrogenous waste product that is produced when the liver breaks down proteins and amino acids. It is then excreted from the body via sweat.
Q #2: Which of the following molecules contains the fewest covalent bonds?

A. Chlorine molecule

B. Ammonia molecule

C. Methane molecule

D. Water molecule

Answer Explanation

A chlorine molecule contains the fewest covalent bonds among the options provided. It consists of two chlorine atoms bonded together by a single covalent bond. Compared with the other options, ammonia has three covalent bonds, methane has 4 while water has 2.
Q #3: Which of the following is an example of a biological macromolecule?

A. Nucleic acid, Protein

B. Monosaccharide

C. Amino and

D. Protein

Answer Explanation

Biological macromolecules are large organic molecules such as carbohydrates, lipids, nucleic acids, and proteins. They are built from smaller molecules, which are linked commonly by covalent bonds, and these can be broken down.

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