Biology Unit 1: Multicellular Organisms

Identify which order is correct...

• cells, organs, organism, tissue, organ system

• organs, organism, tissue, cells, organ system

• cells tissues, organs, organ system, organism

• organism, organs, organ system, tissues, cells

Identify which option best explains the function of the alveoli in terms of gas exchange

• Air moves in and out of the air sac, oxygen diffuses into the blood stream, carbon dioxide diffuses into the air sac (moves from high concentration to low concentration)

• Oxygen moves in and out of the air sac, CO2 diffuses into the blood stream, O2 diffuses into the air sac

• Carbon dioxide moves in and out of the air sac, oxygen diffuses into the blood stream, O2 diffuses into the air sac

• Air moves in and out of the air sac, carbon dioxide diffuses into the blood stream, oxygen diffuses into the air sac (moves from high concentration to low concentration)

Identify the structure in the image above

• hair cell

• villi

• skin cell

• nerve cell

Where is the vili located?

• stomach

• small intestine

• lungs

• heart

What is the function of the vili?

• increase the SA of the small intestine and help with the uptake of nutrients

• decreases the SA of the stomach and prevents nutrient uptake

• increases the SA of the stomach and helps with the uptake of nutrients

• decreases the SA of the small intestine and helps with the uptake of nutrients

What is the purpose of an enzyme?

• slow down a reaction

• increase the temperature

• speed up a reaction

• decrease the pH

identify what substrate amylase, protease and lipase act on (in that order)

• starch, protein, fats/oils

• protein, fats/oils, starch

• fats/oils, protein, starch

• starch, fats/oils, protein

Why do cells contain many different types of enzymes?

• enzymes are specific in their action

• enzymes are temperature specific

• enzymes are pH specific

• enzymes are sensitive to substrate concentration

Why are alveoli efficient at gas exchange in animals?

• thin, moist, shaped in a way that increase SA

• large and dry

• thin with high SA

• moist