Bacterial Diversity and Characteristics
5 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What characteristic distinguishes eubacteria from other bacteria?

  • Rigid cell wall (correct)
  • Production of antibiotics
  • Ability to photosynthesize
  • Presence of flagella

Cyanobacteria can fix atmospheric nitrogen in specialized cells called heterocysts.

True (A)

What is the primary reproductive method used by bacteria?

Fission

_________ are the smallest living cells known and can survive without oxygen.

<p>Mycoplasma</p> Signup and view all the answers

Match the following types of bacteria with their functions:

<p>Cyanobacteria = Photosynthetic autotrophs Chemosynthetic bacteria = Nutrient recycling Heterotrophic bacteria = Decomposers and pathogens Mycoplasma = Pathogenic organisms without cell walls</p> Signup and view all the answers

Flashcards

Cyanobacteria

Unicellular, colonial, or filamentous organisms with chlorophyll that perform photosynthesis.

Chemosynthetic bacteria

Bacteria that obtain energy by oxidizing inorganic substances, like nitrates and ammonia.

Heterotrophic bacteria

Bacteria that obtain nutrients by breaking down organic matter, playing a key role in decomposition.

Fission

A type of bacteria reproduction where a single cell divides into two identical cells.

Signup and view all the flashcards

Mycoplasma

Bacteria that lack cell walls, often pathogenic to animals and plants.

Signup and view all the flashcards

Study Notes

Eubacteria (True Bacteria)

  • Thousands of different types exist, characterized by a rigid cell wall and, if motile, a flagellum.

Cyanobacteria (Blue-green Algae)

  • Possess chlorophyll a, similar to green plants.
  • Photosynthetic autotrophs.
  • Unicellular, colonial, or filamentous.
  • Freshwater, marine, or terrestrial.
  • Colonies often surrounded by a gelatinous sheath.
  • Can form blooms in polluted water bodies.
  • Some fix atmospheric nitrogen in specialized cells called heterocysts (e.g., Nostoc, Anabaena).

Chemosynthetic Autotrophic Bacteria

  • Oxidize inorganic substances (nitrates, nitrites, ammonia) for ATP production.
  • Play a crucial role in nutrient recycling (nitrogen, phosphorus, iron, sulfur).

Heterotrophic Bacteria

  • Abundant in nature.
  • Primarily important decomposers.
  • Impact human affairs:
    • Produce curd from milk.
    • Produce antibiotics.
    • Fix nitrogen in legume roots.
    • Some are pathogens causing diseases (cholera, typhoid, tetanus, citrus canker) - affecting humans, crops, farm animals, and pets.

Bacterial Reproduction

  • Primarily reproduce by binary fission.
  • Can produce spores under unfavorable conditions.
  • Exhibit a primitive form of sexual reproduction through DNA transfer.

Mycoplasma

  • Lack a cell wall.
  • Smallest known living cells.
  • Can survive without oxygen.
  • Many are pathogenic to animals and plants.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Quiz Team

Description

Explore the various types of bacteria, including Eubacteria, Cyanobacteria, and their roles in ecosystems. This quiz covers photosynthesis, nutrient recycling, and the significance of heterotrophic bacteria in human affairs. Test your knowledge on how these microorganisms impact our world!

More Like This

Microbiology Overview and Basics
27 questions
Bacterial Diversity and Classification
26 questions
Bacterial Morphology and Diversity
16 questions
Use Quizgecko on...
Browser
Browser