Q: Which of the following equations correctly represents the overall reaction for aerobic cellular respiration?

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

Question 1

Which of the following statements best explains why Gram-negative bacteria are generally more resistant to antibiotics than Gram-positive bacteria?

Accepted Answer

Gram-negative bacteria possess an outer membrane that acts as a barrier to many antibiotics.

Question 2

A patient develops a persistent infection on an indwelling catheter despite repeated cleaning with disinfectants. Which property of biofilms most likely explains this phenomenon?

Accepted Answer

Biofilms provide an extracellular matrix that protects bacteria from disinfectants.

Question 3

Which of the following best describes the main difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells contain membrane-bound organelles, while prokaryotic cells do not.

Question 4

A bacterium is observed to move toward a nutrient source. Which term best describes this movement, and what structure is primarily responsible?

Accepted Answer

Taxis; flagella

Question 5

Which of the following is a correct sequence of events in aerobic cellular respiration?

Accepted Answer

Glycolysis → Krebs cycle → Electron Transport Chain

Question 6

Which of the following best explains why facilitated diffusion can reach a transport maximum ($$T_{max}$$)?

Accepted Answer

Carrier proteins become saturated when all binding sites are occupied.

Question 7

A scientist isolates a cell with the following characteristics: presence of a nucleus, mitochondria, and 80S ribosomes. Which type of organism is this cell most likely from?

Accepted Answer

Fungus

Question 8

Which of the following equations correctly represents the overall reaction for aerobic cellular respiration?

Accepted Answer

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

Question 9

Which of the following best describes the role of NADH and FADH$$_2 in $$cellular respiration?

Accepted Answer

They carry electrons from glycolysis and the Krebs cycle to the electron transport chain.

Question 10

A bacterial cell is exposed to a competitive inhibitor that binds to the active site of an enzyme. What is the most likely effect on the enzyme's activity?

Accepted Answer

The enzyme's activity will decrease because the inhibitor prevents substrate binding.

Question 11

Which of the following processes is responsible for the uptake of large particles, such as bacteria, by a eukaryotic cell?

Accepted Answer

Phagocytosis

Question 12

During which phase of the eukaryotic cell cycle does DNA replication occur?

Accepted Answer

S phase

Question 13

Which of the following statements about bacterial genetic transfer is correct?

Accepted Answer

Conjugation requires direct cell-to-cell contact for DNA transfer.

Question 14

Which of the following best describes the function of the Golgi apparatus in eukaryotic cells?

Accepted Answer

It modifies, sorts, and packages proteins and lipids for secretion or delivery to other organelles.

Question 15

A mutation occurs in a bacterial gene, changing a single base pair. Which of the following best describes this event?

Accepted Answer

It is a spontaneous mutation that may be passed on during cell division.

Question 16

Which of the following is true regarding osmosis?

Accepted Answer

Osmosis is the movement of water from an area of lower solute concentration to higher solute concentration through a selectively permeable membrane.

Question 17

Which of the following best describes the Calvin-Benson cycle?

Accepted Answer

It is the light-independent reaction that fixes carbon dioxide into sugars.

Question 18

Which of the following statements about ribosomes is correct?

Accepted Answer

Both prokaryotic and eukaryotic ribosomes are involved in protein synthesis.

Question 19

Which of the following best explains why mitochondria are considered the 'powerhouse' of the cell?

Accepted Answer

They are the site of aerobic cellular respiration, producing most of the cell's ATP.

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