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 deep-sea vent that can use hydrogen sulfide ($$\mathrm{H_2S}) as an $$energy source and carbon dioxide ($$\mathrm{CO_2$}) as a $$carbon source. Which nutritional mode does this organism exhibit?

Accepted Answer

Chemoautotrophy

Question 3

Which of the following is NOT one of Koch’s postulates?

Accepted Answer

The microorganism must be able to survive outside the host for at least 24 hours.

Question 4

Which of the following best describes why the phylogenetic tree of life is considered a 'web' rather than a simple tree?

Accepted Answer

Horizontal gene transfer has caused genetic material to move between unrelated lineages.

Question 5

Which of the following is evidence supporting the endosymbiotic theory for the origin of mitochondria?

Accepted Answer

Mitochondria have their own circular DNA similar to bacterial genomes.

Question 6

Which of the following statements about protists is correct?

Accepted Answer

Protists are a paraphyletic group because they do not include all descendants of their most recent common ancestor.

Question 7

Which adaptation allowed plants to colonize land and minimize water loss?

Accepted Answer

Development of a waxy cuticle on the epidermis

Question 8

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 9

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 10

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 11

Which process is responsible for the bulk movement of phloem sap from source to sink in plants?

Accepted Answer

Pressure flow driven by osmotically generated pressure differences

Question 12

A plant is exposed to blue light on one side. Which of the following best describes the cellular mechanism that causes the shoot to bend toward the light?

Accepted Answer

Auxin redistributes to the shaded side, promoting cell elongation there.

Question 13

Which hormone is primarily responsible for promoting seed germination and stem elongation in plants?

Accepted Answer

Gibberellic acid

Question 14

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

Accepted Answer

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

Question 15

Which structure in plant roots is responsible for selective uptake of minerals and prevents the passive flow of substances into the vascular tissue?

Accepted Answer

Endodermis with the Casparian strip

Question 16

A plant growing in dry conditions closes its stomata during the day. What is the most immediate consequence of this action?

Accepted Answer

Reduced water loss but decreased photosynthetic rate due to limited $$\mathrm{CO_2$}$$ uptake

Question 17

Which of the following best describes the role of the hypersensitive response in plant defense?

Accepted Answer

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

Question 18

Which of the following is a key adaptation of fungi that allows them to efficiently absorb nutrients from their environment?

Accepted Answer

A network of hyphae with a high surface area to volume ratio

Question 19

Which of the following best explains why secondary growth in woody plants provides a record of environmental conditions?

Accepted Answer

Annual rings in wood reflect variations in growth rate due to seasonal changes.

Question 20

Which of the following is a mutualistic relationship that helps plants obtain limiting nutrients?

Accepted Answer

Mycorrhizal fungi associating with plant roots to enhance phosphorus uptake

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

Study Guide - Practice Questions

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