Microbiology Quiz

What is the movement of a substance across a membrane with no energy investment?

• Passive transport

• Active transport

What easily diffuses across plasma membranes?

• CO2, H2O, and O2

• Glucose

• Proteins

What is the process that requires energy to move solutes against their concentration gradients?

• Passive transport

• Active transport

What are the two types of endocytosis?

• Pinocytosis and Phagocytosis

• Exocytosis and Endocytosis

What is the term for tiny and microscopic organisms that act as decomposers in ecosystems?

• Microorganisms

• Viruses

• Fungi

What is the process called when bacteria take up DNA from their environment?

• Transformation

• Conjugation

• Transduction

What is the first step in the Gram staining technique?

• Fixation

• Staining

• Decolorization

What color indicates a Gram-positive bacterium?

• Purple

• Pink

• Orange

What is the secondary stain used in Gram staining?

• Safranin

• Crystal violet

• Iodine