Question 1

Which of the following best describes the relationship between producers and consumers in an ecosystem?

Accepted Answer

Producers convert sunlight into chemical energy through photosynthesis, which is then passed to consumers that eat the producers.

Question 2

A scientist wants to test the effect of pH on the activity of the enzyme bromelain. Which of the following is the best example of a controlled experiment?

Accepted Answer

Testing bromelain activity at pH 3.5, 5.1, and 11, while keeping all other variables constant.

Question 3

Which of the following statements about water molecules is correct?

Accepted Answer

Water molecules are polar because oxygen is more electronegative than hydrogen, creating a partial negative charge on oxygen and a partial positive charge on hydrogen.

Question 4

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

Accepted Answer

Unsaturated fatty acids have double bonds that create kinks, preventing tight packing and making them liquid at room temperature.

Question 5

A triglyceride molecule is formed by condensation reactions. How many water molecules are produced when one triglyceride is formed?

Accepted Answer

$$3$$

Question 6

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

Accepted Answer

Storing genetic information for inheritance.

Question 7

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

Accepted Answer

The sequence of amino acids in a polypeptide chain.

Question 8

Which of the following is a correct statement about buffer systems in biological fluids?

Accepted Answer

Buffer systems maintain a constant pH by neutralizing both acids and bases.

Question 9

Which of the following is a polysaccharide found in plant cell walls?

Accepted Answer

Cellulose

Question 10

A scientist observes that the average distance between sea slugs increases dramatically at noon and 4 PM compared to other times. Which variable is most likely responsible for this pattern?

Accepted Answer

Temperature changes due to sunlight exposure.

Question 11

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of electrons between two atoms.

Question 12

Which of the following is true about the structure of phospholipids compared to triglycerides?

Accepted Answer

Phospholipids have two fatty acid chains and a phosphate group, while triglycerides have three fatty acid chains.

Question 13

Which of the following is a correct statement about hydrolysis reactions?

Accepted Answer

Hydrolysis reactions break apart polymers by adding a water molecule.

Question 14

Which of the following is the correct formula for calculating the number of neutrons in an atom?

Accepted Answer

$$	ext{Number of neutrons} = 	ext{Mass number} - 	ext{Atomic number}$$

Question 15

Which of the following is a correct statement about enzymes?

Accepted Answer

Enzymes are proteins that speed up chemical reactions by lowering activation energy.

Question 16

Which of the following is a monomer of nucleic acids?

Accepted Answer

Nucleotide

Question 17

Which of the following is true about the effect of pH on enzyme activity?

Accepted Answer

Enzyme activity is optimal at a specific pH range and decreases outside this range.

Question 18

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

Accepted Answer

It involves the folding of the polypeptide chain into alpha helices and beta sheets.

Question 19

Which of the following is a correct statement about the role of functional groups in organic molecules?

Accepted Answer

Functional groups determine the reactivity and interactions of organic molecules.

Question 20

Which of the following is a correct statement about the difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have membrane-bound organelles, while prokaryotic cells do not.

Unit 2 Study Guide (From Answers)

Study Guide - Practice Questions

Study Guide - Flashcards