Q: Which of the following equations correctly represents the overall process of photosynthesis?

$$6 \ \mathrm{CO}_2 + 6 \ \mathrm{H}_2\mathrm{O} + \text{light energy} \rightarrow \mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6 \ \mathrm{O}_2$$

Question 1

Which of the following best describes the main difference between autotrophs and heterotrophs?

Accepted Answer

Autotrophs produce their own organic molecules from inorganic sources, while heterotrophs must obtain organic molecules by consuming other organisms.

Question 2

A scientist is studying the effect of different wavelengths of light on the rate of photosynthesis in spinach leaves. Which wavelength would you expect to result in the highest rate of photosynthesis, and why?

Accepted Answer

Red and blue light, because chlorophyll absorbs these wavelengths most efficiently.

Question 3

Which of the following correctly matches a chloroplast structure with its function in photosynthesis?

Accepted Answer

Thylakoid membrane: contains chlorophyll and is the site of the light reactions

Question 4

During the light reactions of photosynthesis, which of the following occurs?

Accepted Answer

ATP and NADPH are produced, and oxygen is released as a byproduct.

Question 5

What is the primary role of photosystem II in the light reactions of photosynthesis?

Accepted Answer

To split water molecules, releasing electrons, protons, and oxygen

Question 6

Which of the following equations correctly represents the overall process of photosynthesis?

Accepted Answer

$$6 \ \mathrm{CO}_2 + 6 \ \mathrm{H}_2\mathrm{O} + 	ext{light energy} ightarrow \mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6 \ \mathrm{O}_2$$

Question 7

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

Accepted Answer

It uses ATP and NADPH produced in the light reactions to fix carbon dioxide into organic molecules.

Question 8

A plant living in a hot, dry environment is found to open its stomata only at night to minimize water loss. Which type of photosynthetic pathway does this plant most likely use?

Accepted Answer

CAM pathway

Question 9

Which of the following best describes a virus?

Accepted Answer

A noncellular infectious agent composed of genetic material and a protein coat

Question 10

Which of the following statements about the lytic and lysogenic cycles of bacteriophages is correct?

Accepted Answer

In the lysogenic cycle, the viral genome integrates into the host DNA and can be replicated along with the host genome.

Question 11

Which of the following is a key structural difference between gram-positive and gram-negative bacteria?

Accepted Answer

Gram-positive bacteria have a thick peptidoglycan layer, while gram-negative bacteria have a thin peptidoglycan layer and an outer membrane.

Question 12

Which process allows a prokaryotic cell to take up naked DNA from its environment?

Accepted Answer

Transformation

Question 13

A hospital outbreak is traced to a bacterial strain that acquired antibiotic resistance genes from a virus that previously infected another bacterium. Which genetic process is responsible for this transfer?

Accepted Answer

Transduction

Question 14

Which of the following statements about prokaryotic DNA is correct?

Accepted Answer

Prokaryotic DNA is circular and located in the nucleoid region.

Question 15

Which of the following best describes the metabolism of prokaryotic cells?

Accepted Answer

Prokaryotes exhibit diverse metabolic pathways, including photosynthesis, chemosynthesis, and fermentation.

Question 16

A patient is diagnosed with a prion disease. Which of the following best describes the infectious agent responsible?

Accepted Answer

A misfolded protein that can induce other proteins to misfold

Question 17

Which of the following scenarios best illustrates the concept of host range in viruses?

Accepted Answer

A virus that can only infect a specific species of bacteria due to the presence of a particular surface receptor

Question 18

Which of the following is a unique feature of Archaea compared to Bacteria?

Accepted Answer

Archaea have unique membrane lipids not found in Bacteria or Eukarya.

Question 19

A scientist discovers a new protist that is able to photosynthesize and also ingest food particles. Which term best describes this organism?

Accepted Answer

Mixotroph

Question 20

A researcher exposes a culture of bacteria to a DNA-damaging agent. Some bacteria survive and are found to have acquired new genetic material from dead cells in the environment. Which process most likely explains this genetic change?

Accepted Answer

Transformation, which involves uptake of naked DNA from the environment

Study Guide: Photosynthesis, Viruses, Prokaryotes, and Protists

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