Question 1

If a 12° angle is viewed under a microscope that magnifies 8 times, what will be the apparent angle as seen through the microscope?

Accepted Answer

$$96^\circ$$

Question 2

Which property of carbon allows it to form large, complex molecules essential for life?

Accepted Answer

Its four valence electrons, allowing it to form four covalent bonds

Question 3

What is the shape of a molecule of methane ($$CH_4) $$due to the arrangement of its bonds?

Accepted Answer

Tetrahedral

Question 4

Which of the following best explains why hydrocarbons are hydrophobic?

Accepted Answer

They are composed mostly of carbon and hydrogen, forming nonpolar covalent bonds

Question 5

Which type of isomerism is responsible for the difference between glucose and fructose, both with the formula $$C_6H_{12}O_6$?

Accepted Answer

Structural isomerism

Question 6

A dehydration reaction is important in the synthesis of which of the following?

Accepted Answer

Forming a glycosidic linkage between two monosaccharides

Question 7

Which functional group is present in all amino acids and is responsible for their acidic properties?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 8

Which of the following statements about cellulose and starch is correct?

Accepted Answer

Starch has $$\alpha$$ glycosidic linkages, while cellulose has $$\beta$$ glycosidic linkages

Question 9

Which of the following best describes the structure of a phospholipid in a cell membrane?

Accepted Answer

Two fatty acids and a phosphate group attached to glycerol

Question 10

What is the main function of fats (triacylglycerols) in animals?

Accepted Answer

Long-term energy storage

Question 11

A patient is diagnosed with sickle-cell disease. Which molecular change is responsible for this condition?

Accepted Answer

A single amino acid substitution in the primary structure of hemoglobin

Question 12

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

Accepted Answer

The arrangement and interaction of multiple polypeptide chains

Question 13

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

Accepted Answer

Guanine with cytosine

Question 14

What is the main difference between DNA and RNA nucleotides?

Accepted Answer

DNA contains deoxyribose sugar, while RNA contains ribose sugar

Question 15

Which process is responsible for breaking down polymers into monomers in the digestive tract?

Accepted Answer

Hydrolysis

Question 16

Which of the following best explains why trans fats are considered unhealthy?

Accepted Answer

They are associated with increased risk of coronary heart disease

Question 17

Which of the following is NOT a function of proteins in living organisms?

Accepted Answer

Energy storage

Question 18

Which of the following statements about the Human Genome Project is correct?

Accepted Answer

It enabled rapid sequencing and analysis of genomes, leading to advances in genomics and proteomics

Question 19

Which of the following best describes the relationship between genomics and proteomics?

Accepted Answer

Genomics analyzes large sets of genes, while proteomics analyzes large sets of proteins

Question 20

A scientist is using X-ray crystallography to study a protein. What is the main purpose of this technique?

Accepted Answer

To determine the three-dimensional structure of the protein

Carbon and the Molecular Diversity of Life: Structure and Function of Biological Molecules

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