Problema 3 · Biología URV Practice Test: Biology and Genetics of Prokaryotes

1. What is the chemical composition of most bacterial capsules?

Solución: b) High-molecular-weight polysaccharides

2. Which of the following statements about flagella is INCORRECT?

Solución: c) Archaeal flagella (archaella) feature a central hollow core identical to bacteria

3. Why do Gram-negative pathogens typically display intrinsically higher resistance to β-lactam antibiotics such as penicillin?

Solución: b) Their outer lipid bilayer functions as a selective permeability barrier

4. In what manner do flagellar filaments support bacterial persistence and adaptation?

Solución: b) By enabling chemotactic motility and sensing environmental gradients

5. What is the principal distinction between fimbriae and sex pili?

Solución: a) Pili are typically longer, fewer in number, and mediate conjugative DNA transfer, whereas fimbriae are shorter, abundant, and facilitate surface attachment