Question 1

Which of the following best describes a retrovirus?

Accepted Answer

A virus that uses reverse transcriptase to transcribe its RNA into DNA, which is then integrated into the host's chromosome.

Question 2

Which adaptation allowed early land plants to prevent desiccation (drying out) when colonizing terrestrial environments?

Accepted Answer

Formation of a waxy cuticle covering leaf surfaces

Question 3

A scientist discovers a new infectious agent that is composed solely of misfolded proteins, is resistant to normal cooking temperatures, and has a long incubation period. What is this agent most likely to be?

Accepted Answer

A prion

Question 4

Which of the following is NOT a defense mechanism bacteria use against viral infection?

Accepted Answer

Production of antibodies to neutralize viruses

Question 5

A plant biologist is studying a species that produces both microspores and megaspores. What is this phenomenon called, and what is its significance?

Accepted Answer

Heterospory; it allows for the production of distinct male and female gametophytes

Question 6

Which of the following best explains why the host range of a virus is limited?

Accepted Answer

Viruses can only infect hosts with compatible surface receptors for viral binding.

Question 7

Which of the following is a key difference between the lytic and lysogenic cycles of bacteriophage replication?

Accepted Answer

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

Question 8

Which of the following is a function of the xylem in vascular plants?

Accepted Answer

Transporting water and nutrients and providing mechanical support

Question 9

A plant inherits a viral infection from its parent. What is this type of transmission called?

Accepted Answer

Vertical transmission

Question 10

Which of the following is NOT a trait shared by both plants and their closest algal relatives, the charophytes?

Accepted Answer

Alternation of generations

Question 11

Which of the following best describes the role of mycorrhizal fungi in the colonization of land by early plants?

Accepted Answer

They formed mutualistic relationships with plant roots, aiding in water and mineral absorption.

Question 12

Which of the following is a key feature of nonvascular plants (bryophytes)?

Accepted Answer

Gametophyte-dominant life cycle and lack of true roots, stems, and leaves

Question 13

Which of the following correctly matches the plant structure with its function?

Accepted Answer

Phloem: transports sugars and organic molecules from source to sink

Question 14

A plant biologist observes that a certain plant species produces spores in a specialized structure. What is this structure called?

Accepted Answer

Sporangium

Question 15

Which of the following is a real-world example of a broad host range virus?

Accepted Answer

Rabies virus, which can infect multiple mammalian species

Question 16

Which of the following statements about vaccines is correct?

Accepted Answer

Vaccines are harmless derivatives of pathogens that stimulate the immune system to mount defenses against the actual pathogen.

Question 17

Which of the following equations correctly represents the process by which a diploid sporophyte produces haploid spores?

Accepted Answer

$$2n \xrightarrow{	ext{meiosis}} n$$

Question 18

Which of the following is a key trait that appears in nearly all plants but is absent in charophytes?

Accepted Answer

Alternation of generations

Question 19

A plant scientist is studying a polymer that prevents zygotes from drying out and is also found in plant spore walls. What is this polymer called?

Accepted Answer

Sporopollenin

Question 20

Which of the following best explains why seedless vascular plants are still generally restricted to moist environments?

Accepted Answer

Their sperm are flagellated and require water to swim to the egg for fertilization.

Biology Study Guide: Viruses, Plant Evolution, and Fungi

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