Q: Which equation correctly represents the net ATP yield from complete aerobic oxidation of one glucose molecule?

$\text{Glucose} + 6\,\text{O}_2 \rightarrow 6\,\text{CO}_2 + 6\,\text{H}_2\text{O} + 36\text{--}38\,\text{ATP}$

Question 1

Which of the following best explains why scientists can use non-human cells, such as yeast or E. coli, to study fundamental aspects of human cell biology?

Accepted Answer

All present-day cells share conserved molecular mechanisms due to descent from a common ancestor.

Question 2

A researcher wants to study the genetic basis of multicellular development and cell differentiation. Which experimental model organism would be most appropriate for this study?

Accepted Answer

Caenorhabditis elegans

Question 3

Stanley Miller’s experiment was significant because it demonstrated which of the following?

Accepted Answer

Amino acids can form spontaneously under conditions similar to Earth’s early atmosphere.

Question 4

Which process is responsible for the origin of mitochondria and chloroplasts in eukaryotic cells?

Accepted Answer

Endosymbiosis

Question 5

Which of the following statements correctly compares prokaryotes and eukaryotes?

Accepted Answer

Eukaryotes have multiple linear DNA molecules, while prokaryotes have a single circular DNA molecule.

Question 6

Which type of chemical bond is primarily responsible for holding together the secondary structure of proteins, such as alpha helices and beta sheets?

Accepted Answer

Hydrogen bonds

Question 7

A scientist is studying a membrane protein that can only be extracted from the membrane using detergents that disrupt hydrophobic interactions. This protein is most likely:

Accepted Answer

Integral membrane protein

Question 8

Which of the following factors would most likely increase the fluidity of a cell membrane?

Accepted Answer

Increasing the proportion of unsaturated fatty acids

Question 9

A mutation causes a cell to lack flippase enzymes. What is the most likely consequence?

Accepted Answer

Membrane asymmetry will be lost due to inability to move specific lipids between leaflets.

Question 10

Which of the following best describes the mechanism by which the Na$^+$–K$^+$ pump maintains cell volume and osmotic balance?

Accepted Answer

It uses ATP to export three Na$^+$ ions and import two K$^+$ ions, maintaining ion gradients and preventing cell swelling.

Question 11

Which equation correctly represents the net ATP yield from complete aerobic oxidation of one glucose molecule?

Accepted Answer

$	ext{Glucose} + 6\,	ext{O}_2 ightarrow 6\,	ext{CO}_2 + 6\,	ext{H}_2	ext{O} + 36	ext{--}38\,	ext{ATP}$

Question 12

Which of the following is TRUE regarding the structure and function of actin filaments?

Accepted Answer

Actin filaments are concentrated at the cell periphery, providing mechanical support and enabling cell movement.

Question 13

Which of the following best describes the process of treadmilling in actin filaments?

Accepted Answer

ATP-actin is added to the plus end while ADP-actin dissociates from the minus end, maintaining constant filament length.

Question 14

A patient is treated with taxol, a drug that stabilizes microtubules and prevents their disassembly. What is the most likely cellular effect?

Accepted Answer

Inhibition of mitotic spindle function, blocking cell division.

Question 15

Which of the following statements about membrane transport is correct?

Accepted Answer

Active transport moves molecules against their electrochemical gradient and requires energy.

Question 16

Which of the following best describes the role of cholesterol in the plasma membrane at different temperatures?

Accepted Answer

Cholesterol decreases fluidity at high temperatures and increases fluidity at low temperatures.

Question 17

Which of the following is a correct pairing of a nucleotide base and its complementary base in DNA?

Accepted Answer

Guanine (G) pairs with Cytosine (C)

Question 18

Which of the following best describes the difference between primary and quaternary protein structure?

Accepted Answer

Quaternary structure involves interactions between multiple polypeptide chains, while primary structure is the amino acid sequence.

Question 19

Which of the following is an example of feedback inhibition and allosteric regulation in amino acid biosynthesis?

Accepted Answer

Inhibition of threonine deaminase by isoleucine.

Cell Biology Study Guide: Experimental Models, Biomolecules, Membranes, Transport, and Cytoskeleton

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