23-24 Biology: b) Lipids, Protein Folding, Enzymes, Digestive

What element(s) are primarily found in hydrophobic R-groups? (mark all that apply)

• H

• C

• O

• N

If a polypeptide chain is placed in water, where would hydrophobic groups go?

• Towards the outside edges

• Towards the inside middle

• Both outside and inside

• Depends where the covalent bonds are

What would be a factor in determining the final shape of a protein?

• Temperature of the solution the protein is in

• Number of carbohydrates present

• How many of the same protein is present

• How many different proteins are present

What type of lipid is in the image?

• Trans-unsaturated

• Cis-unsaturated

• Trans-saturated

• Cis-saturated

Which food is likely to NOT contain trans fats?

• Store-bought fish

• Store-bought pastries

• Store-bought fries

• Store-bought popcorn

Enzymes speed up reactions by lowering its (a)   .

Denaturing an enzyme would cause the (a)   to change, causing the substrate unable to bind.

Lactase is combined with lactose to run its reaction. What is the substrate(s)? (mark all that apply)

• Lactase

• Lactose

• Glucose

• Galactose

A reaction tube contains lactase and lactose. It is sealed off with a balloon. What would you expect to find in the test tube? (mark all that apply)

• Lactase

• Glucose

• Galactose

• Inflated balloon

Which organ(s) actively conduct mechanical digestion? (mark all that apply)

• mouth

• esophagus / epiglottis

• stomach

• small intestine