Question 1

A patient is diagnosed with lead poisoning. If the atomic number of lead is 82 and its atomic mass is 207, how many neutrons are present in a lead atom?

Accepted Answer

$$125$$

Question 2

Which of the following best explains why ice floats on water?

Accepted Answer

Hydrogen bonds keep ice molecules spaced apart

Question 3

Which property of water allows insects to walk on its surface?

Accepted Answer

Surface tension

Question 4

A buffer in biological systems serves what primary function?

Accepted Answer

Minimizes changes in pH

Question 5

Which of the following is a polar molecule?

Accepted Answer

$$\mathrm{H_2O}$$

Question 6

Which type of bond is the strongest in biological molecules?

Accepted Answer

Covalent bond

Question 7

Which functional group does NOT contain carbon?

Accepted Answer

Phosphate

Question 8

What is the main product of fossil fuel combustion?

Accepted Answer

Carbon dioxide

Question 9

Which of the following is a monosaccharide?

Accepted Answer

Glucose

Question 10

Which process links monomers into polymers?

Accepted Answer

Dehydration reaction

Question 11

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

Accepted Answer

Primary

Question 12

If a mutation prevents a protein from forming quaternary structure, what would be the most likely consequence?

Accepted Answer

The protein cannot form multiple subunits into a functional unit

Question 13

Which nitrogenous base is found in RNA but not DNA?

Accepted Answer

Uracil

Question 14

Why are saturated fats typically solid at room temperature, while unsaturated fats are liquid?

Accepted Answer

Saturated fats have no double bonds, allowing tighter packing

Question 15

Which part of the amino acid determines its unique chemical properties?

Accepted Answer

R group

Question 16

A protein is exposed to high heat. What would most likely happen?

Accepted Answer

Protein bonds denature and loses its shape

Question 17

Which property of water is directly related to surface tension?

Accepted Answer

Cohesion

Question 18

Which of the following is a storage polysaccharide in plants?

Accepted Answer

Starch

Question 19

Which type of energy is associated with the random movement of atoms and molecules?

Accepted Answer

Thermal energy

Question 20

Which bond is formed between amino acids in a protein?

Accepted Answer

Peptide bond

General Biology: Atomic Structure, Chemical Bonds, Water, Macromolecules, and Proteins

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