Question 1

Which of the following best describes the function of the cytoskeleton in a eukaryotic cell?

Accepted Answer

It provides structural support and helps maintain cell shape.

Question 2

A scientist is studying a microorganism that obtains energy by oxidizing inorganic molecules and uses CO$$_2 as $$its carbon source. Which nutritional category does this organism belong to?

Accepted Answer

Chemoautotroph

Question 3

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy of a reaction, increasing the reaction rate.

Question 4

During glycolysis, one molecule of glucose ($$C_6H_{12}O_6$) is converted into which of the following products?

Accepted Answer

2 molecules of pyruvate, 2 ATP (net), and 2 NADH

Question 5

Which of the following best explains why fermentation is considered less efficient than cellular respiration?

Accepted Answer

Fermentation produces only 2 ATP per glucose, while cellular respiration produces up to 36 ATP per glucose.

Question 6

A mutation causes a bacterium to lack flagella. Which of the following would most likely be affected?

Accepted Answer

The bacterium's ability to move toward nutrients (chemotaxis)

Question 7

Which of the following equations correctly represents the net reaction of glycolysis?

Accepted Answer

$$C_6H_{12}O_6$ + 2 NAD^+ + 2 ADP + 2 P_i \rightarrow 2 C_3H_4O_3 + 2 NADH + 2 ATP + 2 H_2O$$

Question 8

Which of the following is a key difference between prokaryotic and eukaryotic flagella?

Accepted Answer

Eukaryotic flagella are covered by the plasma membrane and contain microtubules, while prokaryotic flagella are not covered by the plasma membrane and are made of flagellin.

Question 9

Which of the following best describes the role of NADH in cellular respiration?

Accepted Answer

NADH acts as an electron carrier, donating electrons to the electron transport chain.

Question 10

A patient is diagnosed with a mitochondrial disorder that impairs the electron transport chain. Which of the following would most likely be observed in this patient’s cells?

Accepted Answer

Decreased ATP production and increased reliance on fermentation

Question 11

Which of the following statements about the Krebs cycle is correct?

Accepted Answer

The Krebs cycle produces NADH, FADH$$_2$$, ATP, and CO$$_2 as $$products.

Question 12

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 13

Which of the following best describes the difference between catabolism and anabolism?

Accepted Answer

Catabolism breaks down molecules to release energy, while anabolism builds molecules and requires energy.

Question 14

A bacterial cell is placed in an environment with no oxygen. Which metabolic pathway will it most likely use to generate ATP?

Accepted Answer

Fermentation

Question 15

Which of the following is true regarding the effect of temperature on enzyme activity?

Accepted Answer

Enzyme activity increases with temperature up to an optimum point, after which activity decreases due to denaturation.

Question 16

Which of the following best describes the role of ATP synthase in cellular respiration?

Accepted Answer

It uses the proton gradient across the membrane to synthesize ATP from ADP and $$P_i.$$

Question 17

Which of the following is a product of fermentation in human muscle cells?

Accepted Answer

Lactic acid

Question 18

A cell is observed to have a cell wall, but no nucleus. Which of the following is the most likely identity of this cell?

Accepted Answer

Prokaryotic cell

Question 19

Which of the following best explains why the electron transport chain requires oxygen?

Accepted Answer

Oxygen acts as the terminal electron acceptor, allowing the chain to continue functioning.

Question 20

Which of the following best describes the relationship between substrate concentration and enzyme activity?

Accepted Answer

Enzyme activity increases with substrate concentration until the enzyme is saturated, after which activity plateaus.

Microbial Cell Structure and Metabolism: Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard