Question 1

Which of the following best explains why Archaea are often found in extreme environments such as hot springs and salt lakes?

Accepted Answer

They possess unique membrane lipids that are more stable at high temperatures and salinities.

Question 2

A scientist isolates a microorganism from a patient with a new disease. According to Koch’s postulates, which step is necessary to confirm this microorganism causes the disease?

Accepted Answer

The microorganism must cause the disease when introduced into a healthy host.

Question 3

Which of the following best describes the main difference between primary and secondary endosymbiosis in the evolution of eukaryotes?

Accepted Answer

Primary endosymbiosis involves engulfing a prokaryote, while secondary endosymbiosis involves engulfing a eukaryotic cell that already contains an endosymbiont.

Question 4

Which of the following is NOT a defining feature of eukaryotic cells?

Accepted Answer

Peptidoglycan cell walls

Question 5

Which adaptation allowed plants to colonize land by reducing water loss?

Accepted Answer

Development of a waxy cuticle on leaves

Question 6

A plant cell has a solute potential ($$\Psi_s) of$$ $$-0.7$$ MPa and a pressure potential ($$\Psi_p) of$$ $$0.5$$ MPa. What is the total water potential ($$\Psi) of $$the cell?

Accepted Answer

$$\Psi = -0.2$$ MPa

Question 7

Which of the following best explains why coal deposits are abundant in West Virginia?

Accepted Answer

Ancient forests of seedless vascular plants accumulated organic matter that was buried and compressed over time.

Question 8

Which of the following best describes the role of the Casparian strip in plant roots?

Accepted Answer

It forces water and solutes to pass through the plasma membranes of endodermal cells, allowing selective uptake.

Question 9

Which of the following is a key difference between monocots and eudicots?

Accepted Answer

Monocots have parallel leaf venation, while eudicots have net-like venation.

Question 10

A plant is exposed to blue light. Which of the following best describes the cellular mechanism that leads to stomatal opening?

Accepted Answer

Blue light activates proton pumps, causing $$\mathrm{K^+}$$ ions to enter guard cells, water follows by osmosis, and the stomata open.

Question 11

Which of the following best explains why the movement of auxin is considered 'polar' in plants?

Accepted Answer

Auxin transport proteins are asymmetrically distributed in cells, causing auxin to move in one direction (typically from shoot tip downward).

Question 12

Which of the following is a primary ecological role of fungi?

Accepted Answer

Decomposition of organic matter, recycling nutrients in ecosystems

Question 13

Which of the following best describes the process of sugar loading at the source in phloem transport?

Accepted Answer

Active transport of sucrose into companion cells, followed by diffusion into sieve tube elements

Question 14

Which of the following best explains why most fertilizers contain nitrogen (N), phosphorus (P), and potassium (K)?

Accepted Answer

These elements are essential macronutrients that are often limiting in soils.

Question 15

A plant cell in a hypotonic solution has a solute potential ($$\Psi_s) of$$ $$-0.5$$ MPa and a pressure potential ($$\Psi_p) of$$ $$0.7$$ MPa. If the surrounding solution has a water potential ($$\Psi) of$$ $$-0.2$$ MPa, in which direction will water move?

Accepted Answer

Water will move out of the cell because the cell's water potential ($$\Psi = 0.2$$ MPa) is higher than the solution's.

Question 16

Which of the following is a key adaptation that allows cacti to maintain photosynthesis in arid environments?

Accepted Answer

Opening stomata at night (CAM photosynthesis) to reduce water loss

Question 17

Which of the following best describes the function of the hypersensitive response in plants?

Accepted Answer

It causes localized cell death to prevent the spread of pathogens.

Question 18

Which of the following best explains why protists are not considered a monophyletic group?

Accepted Answer

They include all eukaryotes that are not plants, animals, or fungi, but do not share a single common ancestor exclusive to them.

Question 19

Which of the following is a real-world example of horizontal gene transfer affecting evolution?

Accepted Answer

The spread of antibiotic resistance genes among bacterial populations via plasmids

General Biology II: Study Guide for Exam #3 – Bacteria, Archaea, Protists, Fungi, and Plant Biology

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