Q: Which of the following best describes the flow of genetic information in a cell?

$DNA \rightarrow RNA \rightarrow \text{Protein}$

Question 1

Which of the following statements best describes the relationship between monomers and polymers in biological macromolecules?

Accepted Answer

Monomers are small molecules that are joined together by dehydration reactions to form polymers.

Question 2

A dehydration reaction is essential in the synthesis of which of the following biological molecules?

Accepted Answer

Polysaccharides, proteins, and nucleic acids

Question 3

Which of the following best explains why cellulose is difficult for most animals to digest?

Accepted Answer

Most animals lack enzymes that can hydrolyze the β glycosidic linkages in cellulose.

Question 4

Which of the following is a correct description of the structure of a fat (triglyceride) molecule?

Accepted Answer

A fat consists of three fatty acids joined to a glycerol molecule by ester linkages.

Question 5

Which of the following statements about phospholipids is true?

Accepted Answer

Phospholipids have hydrophilic heads and hydrophobic tails, allowing them to form bilayers in water.

Question 6

A patient is found to have a high level of trans fats in their blood. Which of the following is a likely source of these fats?

Accepted Answer

Partially hydrogenated vegetable oils

Question 7

Which of the following best describes the primary structure of a protein?

Accepted Answer

The unique sequence of amino acids in a polypeptide chain

Question 8

What type of bond is responsible for stabilizing the secondary structure of proteins?

Accepted Answer

Hydrogen bonds between the backbone constituents

Question 9

A protein exposed to high heat loses its function. What is the most likely explanation for this loss of function?

Accepted Answer

The protein has denatured, losing its three-dimensional structure.

Question 10

Which of the following best describes the flow of genetic information in a cell?

Accepted Answer

$DNA ightarrow RNA ightarrow 	ext{Protein}$

Question 11

Which of the following is a correct pairing of nitrogenous bases in DNA?

Accepted Answer

Adenine (A) pairs with Thymine (T)

Question 12

Which of the following statements about RNA is correct?

Accepted Answer

RNA is usually single-stranded and contains uracil instead of thymine.

Question 13

Which of the following best explains why saturated fats are solid at room temperature while unsaturated fats are liquid?

Accepted Answer

Saturated fats have no double bonds, allowing their molecules to pack closely together.

Question 14

Which of the following is a function of chitin in living organisms?

Accepted Answer

Providing structural support in the exoskeletons of arthropods

Question 15

A scientist is analyzing a molecule with a sugar-phosphate backbone and nitrogenous bases as appendages. Which type of molecule is she most likely studying?

Accepted Answer

A nucleic acid

Question 16

Which of the following best describes the difference between starch and cellulose?

Accepted Answer

Starch has α glycosidic linkages, while cellulose has β glycosidic linkages.

Question 17

Which of the following is a correct statement about the quaternary structure of proteins?

Accepted Answer

It results from the association of two or more polypeptide chains.

Question 18

Which of the following best describes the role of bioinformatics in modern biology?

Accepted Answer

Bioinformatics uses computational tools to analyze large sets of genetic and protein data.

Question 19

A mutation changes a single amino acid in the primary structure of a protein. Which of the following is a possible consequence?

Accepted Answer

The protein may lose its function due to altered folding and structure.

Question 20

Which of the following best explains why humans cannot digest cellulose, but cows can?

Accepted Answer

Cows have symbiotic microbes that produce enzymes to hydrolyze β linkages in cellulose.

The Structure and Function of Large Biological Molecules

Study Guide - Practice Questions

Study Guide - Flashcards