PAX PAX Biology 2

Question 1

Which blood type is considered the universal donor?

Accepted Answer

O negative

Answer

O negative blood has no A, B, or Rh antigens, making it compatible with all blood types.

Question 2

What is osmosis?

Accepted Answer

Movement of water across a semipermeable membrane from low to high solute concentration

Answer

Osmosis is the passive movement of water through a semipermeable membrane from an area of lower solute concentration to higher solute concentration.

Question 3

Which part of the neuron receives signals from other neurons?

Accepted Answer

Dendrites

Answer

Dendrites are tree-like extensions that receive incoming signals from other neurons and transmit them to the cell body.

Question 4

What is the primary function of white blood cells (leukocytes)?

Accepted Answer

Defend against infection

Answer

White blood cells are the main components of the immune system, defending the body against bacteria, viruses, and other pathogens.

Question 5

Where does photosynthesis primarily occur in plant cells?

Accepted Answer

Chloroplasts

Answer

Chloroplasts contain chlorophyll and are the site of photosynthesis, converting sunlight into glucose.

PAX Exam Practice Test