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MCB 2610 exam 1 Question and answers already passed 2024/2025 R235,49   Add to cart
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MCB 2610 exam 1 Question and answers already passed 2024/2025
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MCB 2610 exam 1 Question and answers already passed 2024/2025 MCB 2610 exam 1 prokaryotic cells - correct answer lack a true membrane-delimited nucleus; not absolute eukaryotic cells - correct answer membrane-enclosed nucleus; more complex morphologically classification schemes - cor...

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  • October 16, 2024
  • 11
  • 2024/2025
  • Exam (elaborations)
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MCB 2610 exam 1
prokaryotic cells - correct answer ✔lack a true membrane-delimited nucleus;
not absolute


eukaryotic cells - correct answer ✔membrane-enclosed nucleus; more
complex morphologically


classification schemes - correct answer ✔two group --> 5 kingdom --> 3
domain; developed due to advances in molecular techniques


3 domain system - correct answer ✔Carl Woese (1990); divides
microorganisms based on ribosomal RNA into 3 groups; bacteria, archaea,
eukarya


Domain Bacteria - correct answer ✔single-celled; cell walls with
peptidoglycan; lack membrane bound nucleus; ubiquitous, live in extreme
environments; some disease causing, most beneficial


Domain Archaea - correct answer ✔lack peptidoglycan in cell walls; unique
membrane lipids; unusual metabolic characteristics; extreme environments;
differ from bacteria by rRNA


Domain Eukarya - correct answer ✔larger than bacteria/archaea
(plants/animals); microorganisms are protists (slime/water molds, protozoa,
algae) or fungi (yeast or mold)


viruses - correct answer ✔smallest of all microbes; very simple; requires host
cell to replicate; disease, cancer

, viroids/virusoids - correct answer ✔infectious agents composed of RNA


definition of life - correct answer ✔metabolism, growth, reproduction, genetic
variation/evolution, response to environment, homeostasis


macromolecules - correct answer ✔polypeptides, nucleic acids, lipids,
polysaccharides


microbial evolution - correct answer ✔little oxygen in early atmosphere--
>synthesis of first macromolecules--> cyanobacteria generate atmospheric
oxygen--> complex eukarya


Stanley Miller - correct answer ✔1950s experiment; formed organic materials
from primordial soup; boiling flask (heat of early ocean), electrical sparks
(lightning)


ribozymes - correct answer ✔discovered by Thomas Cech (1981); RNA
molecules that form peptide bonds; catalyze reactions; information storage;
able to do cellular work and replicate itself


micelle - correct answer ✔single lipid layer that formed around ribozymes;
early membrane


endosymbiotic theory - correct answer ✔primitive prokaryotic microbes
ingested other microbes, starting a symbiotic relationship, forming first basic
eukaryotes; mitochondria and chloroplasts


strain - correct answer ✔consists of descendants of a single, pure microbial
culture

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