first 2 in class worksheets

Who of the following provided the evidence needed to discredit the concept of spontaneous generation?

• Pasteur

• Koch

• Semmelweiss

• Lister

Bacterial membrane phospholipids are typically amphiphatic molecules with ______-linked long-chain fatty acids projecting into its hydrophobic interior, whereas Archaean membrane phospholipids are ______-linked

• ether/ester

• ester/ether

• ester/enol

• ester/thiol

Flagellar motility is driven by:

• Proton motive force

• ATP

• chemotaxis

• run and tumbles

You have discovered a new coccoid-shaped microorganism with no nucleus, a rigid cell wall, and a diameter of 2um. Chemical tests reveal that its cell wall does NOT contain peptidoglycan. The new microorganism is...

• most likely a bacterium

• most likely a eukaryote

• most likely an archaeon

• either a bacterium or an archaeon

Proteins that are loosely associated with the cytoplasmic membrane are called ______ proteins

• peripheral

• integral

• external

• internal

All of the following statements about the periplasmic space are true except _______

• it is found only in gram-positive bacteria

• it is located between the plasma membrane and outer membrane of gram-negative bacteria

• it contains hydrolytic enzymes and binding proteins involved in nutrient acquisition

• a minimal periplasmic space may be observed between the plasma membrane and the peptidoglycan in some gram-positive bacteria

If you remove the peptidoglycan layer from a gram-positive cell, it will still stain purple with a gram stain

• true

• false

compared to eukaryotes, bacteria and archaea have _______ surface-to-volume ratios, causing _____ nutrient exchange

• lower/higher

• lower/higher

• higher/lower

• higher/higher

Which of the following can be used to isolate pure cultures of bacteria from mixtures?

• spread plates

• streak plates

• pour plates

• all of the choices are correct

The total number of viable microorganisms remains constant in stationary phase because ______.

• there is a balance between cell division and cell death

• there is a cessation of cell division even though the cells may remain metabolically active

• either of these options are correct

• neither of these options are correct