Q: Which of the following is the correct overall equation for aerobic cellular respiration?

$$\mathrm{C_6H_{12}O_6$ + 6\ O_2$ \rightarrow 6\ CO_2$ + 6\ H_2O + \text{energy}}$$

Question 1

Which of the following best explains why carbon is considered the backbone of biological molecules?

Accepted Answer

Carbon can form up to four covalent bonds, allowing for a diversity of stable, complex structures.

Question 2

A scientist adds a molecule to water and observes that it does not dissolve. Based on the molecule's behavior, which of the following is most likely true about its structure?

Accepted Answer

The molecule is nonpolar and hydrophobic, lacking significant electronegative atoms.

Question 3

Which of the following best describes the difference between the secondary and tertiary structure of a protein?

Accepted Answer

Secondary structure is stabilized by hydrogen bonds between backbone atoms, while tertiary structure is stabilized by interactions among side chains (R groups).

Question 4

Which of the following functional groups acts as a base by accepting hydrogen ions in solution?

Accepted Answer

Amino group

Question 5

A cell is placed in a solution with a higher concentration of solute than the cytoplasm. What will happen to the cell, and why?

Accepted Answer

Water will move out of the cell by osmosis, causing the cell to shrink.

Question 6

Which of the following best explains why ATP hydrolysis can drive endergonic reactions in cells?

Accepted Answer

ATP hydrolysis releases free energy, which can be coupled to endergonic reactions to make them spontaneous.

Question 7

Which of the following is the correct overall equation for aerobic cellular respiration?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$ + 6\ O_2$ ightarrow 6\ CO_2$ + 6\ H_2O + 	ext{energy}}$$

Question 8

During which stage of cellular respiration is the majority of ATP produced, and what is the primary mechanism?

Accepted Answer

Electron transport chain; ATP is produced by chemiosmosis using the proton gradient.

Question 9

Which of the following statements about the Calvin Cycle is correct?

Accepted Answer

The Calvin Cycle uses ATP and NADPH to convert $$\mathrm{CO_2$}$$ into glucose.

Question 10

A mutation changes a codon in a gene from UAU to UAA. What is the most likely effect on the resulting protein?

Accepted Answer

The protein will be truncated due to the introduction of a premature stop codon.

Question 11

Which of the following best describes the difference between prokaryotic and eukaryotic gene expression regulation?

Accepted Answer

Eukaryotes regulate gene expression at multiple levels, including chromatin structure and RNA processing, while prokaryotes primarily regulate at the level of transcription initiation.

Question 12

Which of the following best explains why cellulose cannot be digested by most animals, while starch can?

Accepted Answer

Cellulose has $$\beta-1$$,4-glycosidic bonds, which most animals lack enzymes to hydrolyze, while starch has $$\alpha-1$$,4-glycosidic bonds.

Question 13

Which of the following is a direct result of the action of helicase during DNA replication?

Accepted Answer

Separation of the two parental DNA strands, creating a replication fork.

Question 14

Which of the following best describes the role of the mitotic spindle during mitosis?

Accepted Answer

It attaches to chromosomes and separates sister chromatids to opposite poles of the cell.

Question 15

Which of the following scenarios illustrates energetic coupling in a cell?

Accepted Answer

A nonspontaneous reaction is driven by the hydrolysis of ATP, making the overall process spontaneous.

Question 16

Which of the following best explains why fermentation is necessary in the absence of oxygen?

Accepted Answer

Fermentation regenerates NAD$$^+$$, allowing glycolysis to continue producing ATP.

Question 17

Which of the following statements about the relationship between genotype and phenotype is correct?

Accepted Answer

Genotype determines the sequence of DNA, which is transcribed and translated to produce proteins that contribute to phenotype.

Question 18

Which of the following best describes the arrangement of chromosomes during metaphase I of meiosis?

Accepted Answer

Homologous chromosome pairs align at the metaphase plate.

Question 19

Which of the following is a property shared by both prokaryotic and eukaryotic cells?

Accepted Answer

Both use ribosomes to synthesize proteins from mRNA templates.

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