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Building blocks of proteins Which of the following organic molecules contain both an amine and carboxyl group?

A. Lipids

B. Proteins

C. Cellulose

D. Chitin

Answer Explanation:

The basic building block of the protein is ammonia, which comprises of ammino group -NH2 and a carboxyl group, -COOH.

Therefore, the Correct Answer is B.

Q #1: Which of these infectious agents do not have nucleic acid?

A. viroids

B. viruses

C. bacteria

D. prions

Answer Explanation
Q #2: A myocardial infarction affects which of the following blood vessels of the heart?

A. Aorta

B. Vena cava

C. Pulmonary

D. Coronary

Answer Explanation

A myocardial infarction refers to heart attack, which result from blockage of blood flowing into the heart.

Blocking is caused by the deposition of fat or cholesterol that forms plaque on the surface of coronary arteries, which supply blood to the heart.
Q #3: Gel electrophoresis To separate genomic DNA fragments by size, which of these laboratory methods is most useful?

A. Filtration

B. Titration

C. Electrophoresis

D. Spectrophotometry

Answer Explanation

Electrophoresis is a lab method that is commonly used to separate charge molecules based on their size. Some of the charged molecules include DNA, RNA, and proteins.

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