Free NSAA Biology Questions and Answers

Question 1

Which of the following is the primary structure of a protein?

Accepted Answer

The sequence of amino acids

Answer

The three-dimensional shape formed by hydrogen bonding

Answer

The overall shape formed by interactions between multiple polypeptide chains

Answer

The shape formed by disulfide bridges and ionic bonds

Question 2

In which phase of the cell cycle does DNA replication occur?

Accepted Answer

S phase

Answer

G1 phase

Answer

G2 phase

Answer

M phase

Question 3

Which organelle is responsible for producing ATP through oxidative phosphorylation?

Accepted Answer

Mitochondrion

Answer

Nucleus

Answer

Ribosome

Answer

Lysosome

Question 4

What is the function of ribosomes in the cell?

Accepted Answer

Protein synthesis

Answer

DNA replication

Answer

Lipid synthesis

Answer

Waste breakdown

Question 5

Which of the following best describes the process of osmosis?

Accepted Answer

Movement of water from an area of low solute concentration to high solute concentration

Answer

Movement of solutes from an area of high concentration to low concentration

Answer

Movement of water from an area of high solute concentration to low solute concentration

Answer

Movement of water against the concentration gradient

Question 6

Which of the following statements about enzymes is true?

Accepted Answer

Enzymes decrease the activation energy of a reaction

Answer

Enzymes are consumed during the reaction they catalyze

Answer

Enzymes are specific to a single type of reaction

Answer

Enzymes work equally well at all pH levels

Question 7

What is the primary role of chlorophyll in photosynthesis?

Accepted Answer

Absorbing light energy

Answer

Absorbing water

Answer

Synthesizing glucose

Answer

Releasing oxygen

Question 8

Which of the following processes results in the formation of gametes?

Accepted Answer

Meiosis

Answer

Mitosis

Answer

Binary fission

Answer

Budding

Question 9

What is the main function of the Golgi apparatus in the cell?

Accepted Answer

Modifying, sorting, and packaging proteins for secretion

Answer

Synthesizing proteins

Answer

Generating ATP

Answer

Breaking down waste materials

Question 10

Which type of bond is formed between the oxygen and hydrogen atoms within a single water molecule?

Accepted Answer

Covalent bond

Answer

Ionic bond

Answer

Hydrogen bond

Answer

Metallic bond