Question 1

Which of the following best explains why Gram-negative bacteria are generally more resistant to antibiotics than Gram-positive bacteria?

Accepted Answer

Gram-negative bacteria possess an outer membrane containing lipopolysaccharides that restricts antibiotic penetration.

Question 2

A researcher wants to identify all microbial species present in a soil sample, including those that cannot be cultured in the lab. Which method should they use and why?

Accepted Answer

Metagenomics (environmental sequencing), because it analyzes DNA directly from the environment.

Question 3

Which metabolic strategy is used by cyanobacteria, and what is its ecological significance?

Accepted Answer

Photoautotrophy; it produces oxygen and fixes carbon, influencing atmospheric gas concentrations.

Question 4

Which evidence supports the endosymbiotic origin of mitochondria in eukaryotes?

Accepted Answer

Mitochondria have circular DNA and double membranes similar to certain bacteria.

Question 5

Which of the following is a key difference between primary and secondary endosymbiosis?

Accepted Answer

Primary endosymbiosis involves engulfment of a cyanobacterium, while secondary endosymbiosis involves engulfment of a eukaryotic alga.

Question 6

A plant biologist observes that a certain land plant species has lignified tracheids and vessel elements. What evolutionary advantage do these features provide?

Accepted Answer

They allow for efficient water transport and structural support, enabling greater height.

Question 7

Which adaptation allowed seed plants to reproduce successfully in dry terrestrial environments?

Accepted Answer

Development of sporopollenin-coated pollen grains, enabling water-free fertilization.

Question 8

Which statement best describes the surface-area-to-volume trade-off in fungal mycelia?

Accepted Answer

High surface-area-to-volume ratio maximizes nutrient absorption but increases risk of desiccation.

Question 9

Which process in fungal sexual reproduction results in the fusion of cytoplasm without immediate fusion of nuclei?

Accepted Answer

Plasmogamy

Question 10

Which of the following is a defining synapomorphy of all animals?

Accepted Answer

Multicellularity with extensive extracellular matrix composed of collagen.

Question 11

A scientist is comparing the development of two animal embryos. Embryo A exhibits spiral cleavage and the blastopore becomes the mouth. Embryo B exhibits radial cleavage and the blastopore becomes the anus. Which developmental modes do these embryos represent?

Accepted Answer

Embryo A: Protostome; Embryo B: Deuterostome

Question 12

Which feature distinguishes Lophotrochozoa from Ecdysozoa among protostome animals?

Accepted Answer

Presence of a lophophore feeding structure and trochophore larva in Lophotrochozoa.

Question 13

Which adaptation in insects is most responsible for their evolutionary success and ecological diversity?

Accepted Answer

Complete metamorphosis, which reduces competition between larval and adult stages.

Question 14

Sea stars are considered keystone predators in marine ecosystems. What is the ecological consequence of removing sea stars from a rocky intertidal community?

Accepted Answer

Biodiversity decreases as mussels dominate and outcompete other species.

Question 15

Which of the following is NOT a chordate synapomorphy?

Accepted Answer

Calcium carbonate endoskeleton

Question 16

Which innovation allowed amniotes to reproduce away from water?

Accepted Answer

Development of the amniotic egg with four extraembryonic membranes.

Question 17

According to Villareal’s 'Are Viruses Alive?', which characteristic most challenges the classification of viruses as living organisms?

Accepted Answer

Viruses lack independent metabolism and cannot reproduce without a host cell.

Question 18

Which scenario best illustrates the concept of symbiosis as discussed in Yong’s 'I Contain Multitudes'?

Accepted Answer

The human gut microbiome influencing digestion and immune function.

Question 19

Which of the following best explains how multicellular lineages of Eukaryotes solved the challenge of desiccation on land?

Accepted Answer

Evolution of protective structures such as cuticles in plants and exoskeletons in arthropods.

Question 20

Which statement best describes the role of mycorrhizal fungi in plant nutrition?

Accepted Answer

They form symbiotic associations with plant roots, enhancing nutrient uptake such as phosphorus or nitrogen.

Biodiversity: Bacteria, Archaea, Protists, Plants, Fungi, and Animals – Study Guide

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