Q: A solution has a pH of 4. What is the concentration of hydrogen ions ($$[H^+]) in $$this solution?

$$[H^+] = 1 \times 10$$^{-4}$$ M

Question 1

Which of the following best describes the role of a hypothesis in the scientific method?

Accepted Answer

A hypothesis is a testable statement that predicts the outcome of an experiment.

Question 2

A researcher wants to test the effect of sunlight on plant growth. She assigns plants to two groups: one receives sunlight, the other does not. What is the experimental variable in this scenario?

Accepted Answer

Exposure to sunlight

Question 3

Which of the following molecules is most likely to form hydrogen bonds with water?

Accepted Answer

Ammonia ($$NH_3)$$

Question 4

Which statement about water molecules is correct?

Accepted Answer

Water molecules are polar and can form hydrogen bonds.

Question 5

A solution has a pH of 4. What is the concentration of hydrogen ions ($$[H^+]) in $$this solution?

Accepted Answer

$$[H^+] = 1 	imes 10$$^{-4}$$ M

Question 6

Which of the following functional groups is found in amino acids and is responsible for their acidic properties?

Accepted Answer

Carboxyl ($$-COOH)$$

Question 7

Which of the following best describes a buffer in biological systems?

Accepted Answer

A buffer maintains homeostasis by resisting changes in pH.

Question 8

Which of the following statements about protein structure is correct?

Accepted Answer

Secondary structure involves alpha helices and beta sheets stabilized by hydrogen bonds.

Question 9

Which of the following amino acids is most likely to be found on the exterior of a protein exposed to an aqueous solution?

Accepted Answer

Arginine (hydrophilic)

Question 10

Which of the following is a correct statement about DNA and RNA?

Accepted Answer

DNA is double-stranded, while RNA is usually single-stranded.

Question 11

What type of bond links monosaccharides together in polysaccharides?

Accepted Answer

Glycosidic linkage

Question 12

Cellulose and starch are both polymers of glucose. What structural difference accounts for their different properties?

Accepted Answer

Cellulose has $$\beta-1$$,4-glycosidic linkages, while starch has $$\alpha-1$$,4-glycosidic linkages.

Question 13

Which of the following is a correct statement about the pH scale?

Accepted Answer

A solution with pH 3 is ten times more acidic than a solution with pH 4.

Question 14

Which of the following is NOT a function of polysaccharides in living organisms?

Accepted Answer

Catalyzing chemical reactions

Question 15

Which of the following statements about hydrogen bonds is correct?

Accepted Answer

Hydrogen bonds are responsible for the secondary structure of proteins.

Question 16

Which of the following best explains why proteins can have diverse functions in cells?

Accepted Answer

Proteins have flexible structures that allow them to interact with many molecules.

Question 17

Which of the following is a correct sequence for a DNA strand?

Accepted Answer

$$5' ACTG 3'$$

Question 18

Which of the following is true about the relationship between DNA and RNA in eukaryotic cells?

Accepted Answer

RNA is synthesized from DNA during transcription.

Question 19

Which of the following statements about the structure of cellulose is correct?

Accepted Answer

Cellulose is composed of $$\beta-$$glucose subunits linked by $$\beta-1$$,4-glycosidic bonds.

Question 20

Which of the following is a correct description of a condensation reaction?

Accepted Answer

A reaction that joins monomers together by removing water.

General Biology: Molecular Biology, Biochemistry, and Cell Structure Study Notes

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