Question 1

Which of the following best explains how the sequence of amino acids determines the final shape of a protein?

Accepted Answer

The sequence of amino acids determines the folding pattern due to interactions among side chains, leading to the protein's unique three-dimensional structure.

Question 2

Enzymes speed up chemical reactions by:

Accepted Answer

Lowering the activation energy required for the reaction to proceed.

Question 3

Which of the following is NOT a category of protein?

Accepted Answer

Nucleic acid proteins

Question 4

Compare the functions of ATP and DNA. Which statement is correct?

Accepted Answer

ATP stores and transfers energy for cellular processes, while DNA stores genetic information.

Question 5

Which elements are found in all nucleic acids?

Accepted Answer

Carbon, hydrogen, oxygen, nitrogen, and phosphorus

Question 6

Proteins and DNA are both composed of smaller molecules. True or false? Explain.

Accepted Answer

True; proteins are made of amino acids and DNA is made of nucleotides.

Question 7

What type of bond connects the two strands of nucleotides in DNA?

Accepted Answer

Hydrogen bonds

Question 8

What is the monomer of nucleic acids and the monomer of proteins?

Accepted Answer

Nucleotides for nucleic acids; amino acids for proteins.

Question 9

Which of the following best describes the function of nucleic acids?

Accepted Answer

Storing and transmitting genetic information.

Question 10

At which level of protein structure do alpha helices and beta sheets occur?

Accepted Answer

Secondary structure

Question 11

Which of the following is NOT a difference between prokaryotic and eukaryotic cells?

Accepted Answer

Both prokaryotic and eukaryotic cells have mitochondria.

Question 12

Which structure is present in plant cells but not in animal cells, contributing to rigidity?

Accepted Answer

Cell wall

Question 13

A bacterial cell is placed from a hypertonic environment into a hypotonic environment. What will most likely happen to the cell?

Accepted Answer

Water will enter the cell by osmosis, possibly causing it to burst.

Question 14

Which of the following best describes the difference between passive and active transport?

Accepted Answer

Passive transport does not require energy, while active transport requires energy (often in the form of ATP).

Question 15

Which of the following is NOT a component found in all cell types?

Accepted Answer

Nucleus

Question 16

Which type of cellular transport is primarily responsible for removing waste from cells?

Accepted Answer

Exocytosis

Question 17

Which type of junction is NOT present in animal cells?

Accepted Answer

Plasmodesmata

Question 18

Which of the following best describes the function of mitochondria?

Accepted Answer

Site of ATP production through cellular respiration.

Question 19

Which of the following best describes a semipermeable membrane?

Accepted Answer

A membrane that allows certain molecules to pass while blocking others.

Question 20

A scientist is studying Taq polymerase activity at various temperatures. If the enzyme's activity peaks at $$72\ ^\circ \mathrm{C}$$, what is the optimal temperature for this enzyme?

Accepted Answer

$$72\ ^\circ \mathrm{C}$$

Study Guidance for Protein, Enzyme, Cell, and Transport Concepts in Nutrition

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