Question 1

Which of the following statements best explains why viruses are considered obligate intracellular parasites?

Accepted Answer

They lack their own metabolic enzymes and must use the host's cellular machinery to replicate.

Question 2

A patient is diagnosed with a brain disease caused by a slow-acting, hard-to-destroy infectious agent. Which of the following is most likely responsible?

Accepted Answer

A prion

Question 3

Which of the following best describes the difference between the lytic and lysogenic cycles in bacteriophages?

Accepted Answer

The lytic cycle results in the destruction of the host cell, while the lysogenic cycle allows the viral genome to persist in the host without killing it.

Question 4

Which of the following is a unique feature of Gram-negative bacteria compared to Gram-positive bacteria?

Accepted Answer

They have an outer membrane and a thin peptidoglycan layer, appearing red after Gram staining.

Question 5

A soil bacterium is found to produce a fruiting body and is classified as a delta proteobacterium. Which genus does it most likely belong to?

Accepted Answer

Myxobacteria

Question 6

Which of the following best explains why cyanobacteria are considered important in the evolution of life on Earth?

Accepted Answer

They are photosynthetic and contributed to the oxygenation of Earth's atmosphere.

Question 7

Which of the following is a correct statement about the endosymbiotic hypothesis for the origin of mitochondria?

Accepted Answer

An early eukaryote engulfed a bacterium, which became the mitochondrion.

Question 8

Which of the following protists is responsible for causing sleeping sickness in humans, and what is its vector?

Accepted Answer

Trypanosoma brucei; Tsetse fly

Question 9

Which of the following adaptations allowed plants to successfully colonize land?

Accepted Answer

Evolution of a waxy cuticle and lignified cell walls for support and water retention

Question 10

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

Accepted Answer

Plants alternate between a diploid sporophyte and a haploid gametophyte stage.

Question 11

Which of the following is a distinguishing feature of monocots compared to eudicots?

Accepted Answer

Monocots have parallel leaf veins, while eudicots have branched veins.

Question 12

Which of the following best explains the evolutionary advantage of seeds and pollen grains in seed plants?

Accepted Answer

They enable reproduction without the need for water for sperm movement.

Question 13

Which of the following is true regarding the structure and function of xylem and phloem in vascular plants?

Accepted Answer

Xylem conducts water and minerals; phloem conducts sugars.

Question 14

A botanist observes a plant with vascular bundles scattered throughout the stem, parallel leaf veins, and a single cotyledon. Which group does this plant most likely belong to?

Accepted Answer

Monocots

Question 15

Which of the following best describes double fertilization in angiosperms?

Accepted Answer

One sperm fertilizes the egg, and another sperm fuses with two polar nuclei to form the triploid endosperm.

Question 16

Which of the following is a correct match between a fungal group and its characteristic?

Accepted Answer

Basidiomycetes – club fungi and decomposers

Question 17

A plant breeder uses grafting to save a grapevine crop from a root disease. In this process, what is the correct terminology for the rooted plant and the grafted part?

Accepted Answer

Rooted plant: stock; Grafted part: scion

Question 18

Which of the following best explains why fungi are essential for plant colonization of land?

Accepted Answer

Fungi form mycorrhizal associations that enhance water and mineral uptake.

Question 19

Which of the following is a correct description of the ABC hypothesis in flower development?

Accepted Answer

It explains how three classes of genes interact to determine the identity of floral organs.

Question 20

A scientist discovers a new organism with the following features: cell walls with chitin, external digestion, and filamentous hyphae. Which kingdom does this organism most likely belong to?

Accepted Answer

Fungi

Study Guide: Viruses, Prokaryotes, Eukaryotic Diversification, Fungi, and Plant Biology

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