Question 1

Which of the following best explains why Archaea and Bacteria are classified into separate domains in the three-domain system?

Accepted Answer

Archaea and Bacteria both lack membrane-bound organelles, but Archaea share more genetic similarities with Eukarya.

Question 2

A scientist discovers a new unicellular organism with mitochondria and chloroplasts. Which evolutionary process most likely explains the origin of these organelles?

Accepted Answer

Endosymbiosis, where ancestral eukaryotes engulfed prokaryotic cells

Question 3

Which of the following laboratory safety practices is most important when handling unknown bacterial cultures?

Accepted Answer

Tying back long hair and wearing gloves and goggles

Question 4

Which of the following best describes the alternation of generations in land plants?

Accepted Answer

A life cycle in which multicellular haploid and diploid stages alternate

Question 5

A plant physiologist measures the water potential ($$\Psi) in a $$plant cell and finds it to be $$-0.5$$ MPa, while the surrounding soil has a water potential of $$-0.2$$ MPa. In which direction will water move?

Accepted Answer

Water will move from the soil into the cell.

Question 6

Which of the following is a key innovation that allowed seed plants to colonize dry terrestrial environments more successfully than non-seed plants?

Accepted Answer

Production of pollen grains for sperm dispersal

Question 7

Which of the following best explains why fungi are critical to ecosystem nutrient cycling?

Accepted Answer

Fungi decompose organic matter, releasing nutrients back into the environment.

Question 8

A population of rabbits in a field grows according to the logistic growth model. If the carrying capacity ($$K) is 500 $$and the current population ($$N) is 250$$, which equation best describes the population growth rate ($$dN/dt$$)?

Accepted Answer

$$dN/dt = rN \left(1 - \frac{N}{K}\right)$$

Question 9

Which of the following is a distinguishing feature of animals with bilateral symmetry compared to those with radial symmetry?

Accepted Answer

Bilateral symmetry is associated with cephalization, the development of a head region.

Question 10

Which of the following best describes the role of mycorrhizal fungi in plant health?

Accepted Answer

They form mutualistic associations with roots, enhancing water and nutrient absorption.

Question 11

A student observes a protist under the microscope that moves using cilia and has both a macronucleus and micronucleus. To which major supergroup does this organism most likely belong?

Accepted Answer

SAR (specifically Alveolata)

Question 12

Which of the following is a primary advantage of amniotic eggs in vertebrate evolution?

Accepted Answer

They provide a self-contained aquatic environment for embryo development on land.

Question 13

Which of the following best describes the difference between xylem and phloem in vascular plants?

Accepted Answer

Xylem transports water and minerals upward; phloem transports sugars in multiple directions.

Question 14

Which of the following interspecific interactions is correctly matched with its effect on the two species involved?

Accepted Answer

Mutualism: both species benefit

Question 15

Which of the following is a direct consequence of human-induced increases in atmospheric carbon dioxide ($$CO_2) on $$global ecosystems?

Accepted Answer

Enhanced greenhouse effect leading to global climate change

Question 16

Which of the following best explains why gymnosperms and angiosperms are both considered seed plants, but differ in their reproductive strategies?

Accepted Answer

Angiosperms produce seeds within fruits, while gymnosperms produce naked seeds.

Question 17

A population of fish in a lake is observed to have a birth rate of 0.2 per year and a death rate of 0.1 per year. If the current population size is 1,000, what is the expected population size after one year, assuming exponential growth? Use the equation $$N_{t+1} = N_t e$$^{(b-d)}$$.

Accepted Answer

$$N_{t+1} = 1,000 	imes e$$^{0.1}$$ \approx 1,105$$

Question 18

Which of the following is a unique adaptation that enables birds to fly?

Accepted Answer

Development of hollow bones and feathers

Question 19

Which of the following best describes the flow of energy through an ecosystem?

Accepted Answer

Energy flows in one direction, from producers to consumers to decomposers, and is eventually lost as heat.

Question 20

Which of the following is a primary goal of sustainable development in conservation biology?

Accepted Answer

Balancing human needs with the preservation of biodiversity for future generations

General Biology II (BIO 113) Syllabus and Course Structure Study Guide

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