$$\text{Atomic mass} = \text{Number of protons} + \text{Number of neutrons}$$

Question 1

Which of the following best describes the process of dehydration synthesis in biological systems?

Accepted Answer

It forms polymers from monomers by removing a water molecule.

Question 2

A scientist is studying the effect of pH on enzyme activity. Which of the following is the independent variable in this experiment?

Accepted Answer

The pH of the solution

Question 3

Which of the following correctly lists the four levels of protein structure in order from simplest to most complex?

Accepted Answer

Primary, secondary, tertiary, quaternary

Question 4

Which equation correctly represents the dissociation of water and the formation of hydronium and hydroxide ions?

Accepted Answer

$$2H_2O \rightarrow H_3O^+ + OH^-$$

Question 5

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

Accepted Answer

Cellulose

Question 6

A biologist is comparing saturated and unsaturated fatty acids. Which statement is correct?

Accepted Answer

Saturated fatty acids have no double bonds and are typically found in animal fats.

Question 7

Which of the following best explains why carbon atoms are the backbone of organic molecules?

Accepted Answer

Carbon can form up to four covalent bonds, allowing for complex and diverse molecular structures.

Question 8

Which of the following is the correct formula for calculating the atomic mass of an atom?

Accepted Answer

$$	ext{Atomic mass} = 	ext{Number of protons} + 	ext{Number of neutrons}$$

Question 9

Which of the following statements about nucleic acids is correct?

Accepted Answer

DNA stores genetic information, while RNA helps in protein synthesis.

Question 10

A student is asked to draw the structure of an amino acid. Which of the following groups is NOT present in all amino acids?

Accepted Answer

Phosphate group ($$-PO_4$)

Question 11

Which of the following best describes the role of a control group in a scientific experiment?

Accepted Answer

It is used to compare results and determine the effect of the independent variable.

Question 12

Which of the following is a correct example of a hypothesis in the scientific method?

Accepted Answer

Plants need sunlight to grow.

Question 13

Which of the following is a correct comparison between prokaryotic and eukaryotic cells?

Accepted Answer

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

Question 14

Which of the following best describes the difference between monosaccharides and polysaccharides?

Accepted Answer

Monosaccharides are simple sugars, while polysaccharides are complex carbohydrates made of many monosaccharide units.

Question 15

Which of the following is a correct example of a real-world application of hydrolysis?

Accepted Answer

Digestion of starch into glucose in the human digestive system.

Question 16

Which of the following best explains why water is considered a polar molecule?

Accepted Answer

It has an uneven distribution of electrons, resulting in a partial positive charge on hydrogen and a partial negative charge on oxygen.

Question 17

Which of the following is the correct formula for calculating pH?

Accepted Answer

$$pH = -\log_{10}[H^+]$$

Question 18

Which of the following statements about protein denaturation is correct?

Accepted Answer

Denaturation changes the protein's shape and function without breaking peptide bonds.

Question 19

Which of the following is a correct example of a covalent bond in a biological molecule?

Accepted Answer

The bond between hydrogen and oxygen in a water molecule ($$H_2O)$$

General Biology: Foundations, Scientific Method, and Chemical Basis of Life

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