It is basic and will decrease H\textsuperscript{+} concentration.

Question 1

Which of the following best describes the role of enzymes in chemical reactions within the human body?

Accepted Answer

Enzymes lower the activation energy, speeding up reactions without being used up.

Question 2

A solution with a pH of 4 is considered:

Accepted Answer

Acidic

Question 3

Which of the following molecules is hydrophobic?

Accepted Answer

Triglyceride

Question 4

What is the main function of ATP (Adenosine Triphosphate) in cells?

Accepted Answer

Provides energy for cellular processes when phosphate bonds break

Question 5

Which of the following is true about facilitated diffusion?

Accepted Answer

It uses carrier proteins to move molecules down their concentration gradient.

Question 6

Which nitrogenous base is found only in RNA and not in DNA?

Accepted Answer

Uracil

Question 7

A buffer in a biological system functions to:

Accepted Answer

Resist changes in pH

Question 8

Which of the following best explains why water is considered a universal solvent?

Accepted Answer

Water is polar and can dissolve many ionic and polar substances.

Question 9

Which level of protein structure is defined by the sequence of amino acids?

Accepted Answer

Primary

Question 10

Which of the following processes requires energy input from ATP?

Accepted Answer

Primary active transport

Question 11

A patient is given a solution with a pH of 8. Which of the following best describes this solution?

Accepted Answer

It is basic and will decrease H	extsuperscript{+} concentration.

Question 12

Which of the following is a polysaccharide used for energy storage in humans?

Accepted Answer

Glycogen

Question 13

Which of the following statements about phospholipids in the plasma membrane is correct?

Accepted Answer

Phospholipids have hydrophilic heads and hydrophobic tails, forming a bilayer.

Question 14

Which of the following best describes osmosis?

Accepted Answer

Diffusion of water across a selectively permeable membrane.

Question 15

Which of the following is a property of saturated fatty acids?

Accepted Answer

Contain no double bonds

Question 16

Which of the following is NOT a function of membrane proteins?

Accepted Answer

Energy storage

Question 17

Which of the following best describes dehydration synthesis?

Accepted Answer

Forms bonds by removing water

Question 18

Which of the following is a correct statement about the double helix structure of DNA?

Accepted Answer

It was discovered by Watson & Crick.

Question 19

Which of the following is true about secondary active transport?

Accepted Answer

It uses energy from ion gradients to transport substances.

Question 20

Which of the following is a correct example of an anabolic reaction?

Accepted Answer

Synthesis of proteins from amino acids

Chemical Level of Organization & Cell Biology: Study Notes

Study Guide - Practice Questions