Question 1

A competitive inhibitor of lipase will most closely resemble which of the following molecules?

Accepted Answer

A fatty acid

Question 2

A person diagnosed with phenylketonuria (PKU) will have ________ levels of phenylalanine (Phe) in their blood.

Accepted Answer

Elevated

Question 3

Why must people with PKU avoid consuming aspartame?

Accepted Answer

Because it contains phenylalanine

Question 4

In the PAH-catalyzed reaction, what is the role of BH4?

Accepted Answer

Co-enzyme/co-factor

Question 5

Which of the following statements is NOT true about competitive enzyme inhibitors?

Accepted Answer

They bind somewhere other than the active site

Question 6

When a noncompetitive inhibitor binds an enzyme, what happens?

Accepted Answer

The active site changes shape

Question 7

Which of the following is true of all endergonic reactions?

Accepted Answer

The products have higher energy than the reactants

Question 8

Catabolic pathways __________ complex molecules and __________ energy.

Accepted Answer

Break down; release

Question 9

Which type of molecule can most easily cross a plasma membrane by simple diffusion?

Accepted Answer

Small and hydrophobic

Question 10

In order for an amino acid to enter a cell by facilitated diffusion, what is required?

Accepted Answer

A carrier

Question 11

A person has become severely dehydrated. What treatment is most likely to be helpful?

Accepted Answer

Isotonic solution

Question 12

A person has lost a lot of blood through a serious wound. How is the blood remaining in their body best described?

Accepted Answer

Isotonic

Question 13

A plant cell is plasmolyzed. What can you infer about its environment?

Accepted Answer

It is hypertonic

Question 14

You are looking at a plasma membrane from the outside of the cell. Which part of the phospholipids can you see?

Accepted Answer

The heads

Question 15

Can K$$^+$$ cross a membrane from an area of high concentration to an area of low concentration?

Accepted Answer

Yes, by facilitated diffusion

Question 16

What kind of transport protein does a monosaccharide (sugar) need to enter a cell from an area of high concentration to an area of low concentration?

Accepted Answer

A carrier protein

Question 17

What do kinases do?

Accepted Answer

Phosphorylate targets

Question 18

How can you recognize an activated receptor tyrosine kinase?

Accepted Answer

It is a phosphorylated dimer

Question 19

Epinephrine __________ blood sugar by acting on __________ cells.

Accepted Answer

Increases; liver

Question 20

Glucose enters muscle cells by facilitated diffusion in response to __________ signaling.

Accepted Answer

Insulin

practice exam

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