Bacteria Structure and Gram Stain Quizz

Choose the statement below that correctly explains bacteria:

• All bacteria are pathogentic (cause disease)

• Bacteria are eukaryotic cells

• Bacteria use chemicals and/or light to obtain their energy. They are autotrophs.

• Bacteria use chemicals and/or light to obtain their energy. They are heterotrophs.

Tags

NGSS.MS-LS1-1

NGSS.MS-LS1-2

Why are bacteria able to grow their population quickly and often exponentially?

• They reproduce asexually via binary fission, which only takes 20 minutes

• They live a long time

• Because vibes.

• They reproduce via binary fission, which doesn't involve replication their DNA so it's a quick process.

What type of bacteria is shown?

• Gram + bacillus

• Gram + coccus

• Gram - bacillus

• Gram - coccus

Identify the structure that allows bacteria to move in it's envrionment.

• Flagella

• Pilli

• Chromosome

• Ribosome

Select all descriptions that correctly explain the genetic material of bacteria.

• Bacteria don't have DNA

• Bacteria have a large circular strand of DNA called a nucleoid

• Bacteria have small circular strands of DNA called plasmids.

• Bacteria have linear strands of DNA called chromosomes.

True or false: the genes on bacterial plasmids are not vital (essential for bacteria function).

• True

• False

True or false: the genes on bacterial nucleoids are not vital (essential for bacteria function).

• True

• False

Why are gram - bacteria usually pathogenic? (cause disease)

• They have lipopolysaccharides in their cell membrane that are cytotoxic (harmful to other cells)

• They have a thin layer of peptidoglycan which makes it more resistant

• They have a very thick layer of peptidoglycan which makes it more resistant

• They have two membranes.

Tags

NGSS.HS-LS4-4

What is the primary component of gram + bacterial cell walls?

• Peptidoglycan

• Lipopolysaccharides

• Protein

• Lipid

What is the main difference between the cell walls of Gram-positive and Gram-negative bacteria?

• Gram-positive bacteria have a thick peptidoglycan layer, while Gram-negative bacteria have a thin one

• Gram-positive bacteria have a thin peptidoglycan layer, while Gram-negative bacteria have a thick one

• Gram-positive bacteria have a cell wall made of lipopolysaccharides, while Gram-negative bacteria have a cell wall made of peptidoglycan

• Gram-positive bacteria have a cell wall made of peptidoglycan, while Gram-negative bacteria have a cell wall made of lipopolysaccharides