Question 1

Which of the following best explains why potassium ($$K^+) is $$more likely to form a cation than a sodium ($$Na^+) $$atom, even though both are in Group 1 of the periodic table?

Accepted Answer

Potassium has a larger atomic radius, making it easier to lose its outermost electron.

Question 2

A patient is diagnosed with anemia due to a mutation that changes the structure of hemoglobin. Which level of protein structure is most directly affected by this mutation?

Accepted Answer

Primary structure

Question 3

Which of the following best describes the difference between an ionic bond and a covalent bond?

Accepted Answer

An ionic bond involves the transfer of electrons, while a covalent bond involves the sharing of electrons.

Question 4

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

Accepted Answer

The oxygen atom is more electronegative than the hydrogen atoms, creating a partial negative charge on oxygen and a partial positive charge on hydrogen.

Question 5

A solution has a pH of 5.8. How many times more acidic is it than a solution with a pH of 7.8? (Use the formula $$	ext{Acidity~difference} = 10$$^{|pH_1 - pH_2|}$$)

Accepted Answer

$$100$$ times more acidic

Question 6

Which of the following best explains why lipids are insoluble in water?

Accepted Answer

Lipids are nonpolar and water is polar, so they do not mix due to hydrophobic interactions.

Question 7

Which of the following is a function of enzymes in the human body?

Accepted Answer

They lower the activation energy required for chemical reactions.

Question 8

A patient is given a solution containing $$NaCl ($$sodium chloride) and $$CaCO_3 ($$calcium carbonate). Which of the following best describes the type of mixture formed?

Accepted Answer

Solution and suspension, respectively

Question 9

Which of the following best describes the difference between DNA and RNA?

Accepted Answer

DNA contains deoxyribose sugar, while RNA contains ribose sugar.

Question 10

Which of the following best explains why glucose is classified as a monosaccharide?

Accepted Answer

It is composed of a single sugar unit and cannot be hydrolyzed into simpler sugars.

Question 11

Which of the following statements about phospholipids is correct?

Accepted Answer

They have a hydrophilic head and two hydrophobic tails, making them essential for cell membrane structure.

Question 12

A patient is found to have a deficiency in the enzyme lactase. Which of the following best describes the likely consequence?

Accepted Answer

The patient will have difficulty digesting lactose, leading to gastrointestinal symptoms.

Question 13

Which of the following best describes the difference between saturated and unsaturated fatty acids?

Accepted Answer

Saturated fatty acids have no double bonds between carbon atoms, while unsaturated fatty acids have one or more double bonds.

Question 14

Which of the following best explains the role of ATP in cellular metabolism?

Accepted Answer

ATP stores and transfers energy for cellular processes.

Question 15

A patient is experiencing muscle cramps due to an electrolyte imbalance. Which ion is most likely involved, and what is its primary function in muscle contraction?

Accepted Answer

Calcium ($$Ca^{2+}$$); it triggers the interaction between actin and myosin.

Question 16

Which of the following best describes the difference between kinetic and potential energy in the context of muscle contraction?

Accepted Answer

Kinetic energy is the energy of movement during contraction, while potential energy is stored in ATP before contraction.

Question 17

Which of the following best explains why enzymes are specific to their substrates?

Accepted Answer

The active site of an enzyme has a unique shape that fits only specific substrates.

Question 18

Which of the following best describes the function of buffers in maintaining homeostasis?

Accepted Answer

Buffers resist changes in pH by accepting or donating hydrogen ions ($$H^+).$$

Question 19

Which of the following best explains the difference between a peptide and a polypeptide?

Accepted Answer

A peptide is a short chain of amino acids, while a polypeptide is a longer chain.

Question 20

Which of the following best describes the role of phospholipids in the cell membrane?

Accepted Answer

They form a bilayer that acts as a barrier to most water-soluble substances.

Fundamental Concepts in Chemistry and Biochemistry for Anatomy & Physiology

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