Question 1

Which of the following best explains why lipids are not considered true polymers?

Accepted Answer

Lipids are not composed of repeating monomer units joined by covalent bonds.

Question 2

A dehydration reaction is crucial in the formation of which of the following biological molecules?

Accepted Answer

Polysaccharides, proteins, and nucleic acids

Question 3

Refer to the image of the amino acid monomer. Which part of the molecule determines the unique properties of each amino acid?

Accepted Answer

The R group

Question 4

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

Accepted Answer

Both are polymers of glucose, but only cellulose strengthens plant cell walls.

Question 5

A scientist is analyzing a molecule with a structure similar to the one labeled 'steroid backbone.' Which function is most likely associated with this molecule?

Accepted Answer

Acting as a signaling hormone

Question 6

Which of the following best describes the structure of a phospholipid, as shown in the images?

Accepted Answer

A glycerol backbone, two fatty acid tails, and a phosphate-containing head

Question 7

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

Accepted Answer

Catalyzing chemical reactions

Question 8

A mutation changes the sequence of nucleotides in a gene. Which molecule will be directly affected by this change?

Accepted Answer

The protein encoded by the gene

Question 9

Which of the following best explains why butter is solid at room temperature while olive oil is liquid?

Accepted Answer

Butter contains saturated fatty acids, while olive oil contains unsaturated fatty acids.

Question 10

Which of the following is a correct pairing of a macromolecule and its monomer?

Accepted Answer

Protein – amino acid

Question 11

Which process is responsible for breaking down polymers into their monomers, and what molecule is required for this reaction?

Accepted Answer

Hydrolysis; water

Question 12

Which of the following best describes the role of complementary base pairing in nucleic acids?

Accepted Answer

It ensures accurate replication and transcription of genetic information.

Question 13

A researcher is comparing the DNA sequences of a gene in fruit flies, fish, mice, and humans. According to evolutionary theory, which two species are likely to have the most similar DNA sequences?

Accepted Answer

Mice and humans

Question 14

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

Accepted Answer

Strengthening animal exoskeletons and fungal cell walls

Question 15

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

Accepted Answer

Genomics studies large sets of genes or genomes, while proteomics studies large sets of proteins.

Question 16

Which of the following is a correct description of the structure shown in the nucleotide image?

Accepted Answer

A nucleotide, consisting of a phosphate group, a sugar, and a nitrogenous base

Question 17

Which of the following best explains why phospholipids form bilayers in water?

Accepted Answer

Their hydrophilic heads interact with water, while their hydrophobic tails avoid water.

Question 18

Which of the following is a real-world example of a protein's function?

Accepted Answer

Hemoglobin transporting oxygen in the blood

Question 19

Which of the following best describes the difference between DNA and RNA?

Accepted Answer

DNA contains deoxyribose and thymine; RNA contains ribose and uracil.

Question 20

Which of the following is a direct application of bioinformatics in modern biology?

Accepted Answer

Analyzing large sets of genetic data to identify disease-related genes

The Structure and Function of Large Biological Molecules

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