Cytoskeletal Structures and Cell Membranes Quiz

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Which one of these is a behavioral characteristic of cells deficient in steroid hormones and cholesterol?

Improperly functioning lysosomes
Deficiency in smooth ER
Lack of motility (correct)
Lack of membrane proteins

What might you expect to see when exposing cells deficient in steroid hormones and cholesterol to very cold conditions in the lab?

The distribution of unsaturated and saturated fatty acids in the phospholipid bilayer will determine the cell's behavior in the cold
These cells will freeze at a warmer temperature compared to cells without the deficiency
Enzymatic reactions in the cell will likely slow down
All of the above (correct)

What concept in biology can be illustrated by a messy kitchen during remodeling?

The second law of thermodynamics (correct)
A theory
The first law of thermodynamics
Active transport

Following a meal high in protein, how are amino acids transported and stored in cells?

Transporter that does not require ATP (B) Signup and view all the answers

What would you expect to see in cells deficient in steroid hormones and cholesterol?

None of the above (D) Signup and view all the answers

What is the purpose of breaking down protein into its component amino acids and storing them in cells?

For use during translation (D) Signup and view all the answers

Which of the following is true about amino acid transport into cells?

Amino acids are transported by active transport (B) Signup and view all the answers

In the figure above, which egg experienced a weight gain after being placed in a 15% NaCl solution?

Egg 3 (A) Signup and view all the answers

After placing Egg 2 in an unknown solution, the egg begins to swell. What can you conclude about the unknown solution?

The unknown solution has a concentration greater than 15% NaCl (C) Signup and view all the answers

What is the portion of a system's energy that can perform work called?

Free energy (B) Signup and view all the answers

Why is ATP important to metabolism?

Hydrolysis of the bond between adenine and ribose in ATP is commonly used to release energy that can be used to drive other cellular reactions (D) Signup and view all the answers

What role does amylase play in the breakdown of starch?

Amylase decreases the activation energy required for the reaction (B) Signup and view all the answers

Which cytoskeletal structure is composed of actin and regulates cell shape, cell movement, and muscle contraction?

Microfilaments (A) Signup and view all the answers

Which organelle is most likely affected in Tay Sachs syndrome, a fatal human disease caused by the accumulation of lipids in the brain?

Lysosomes (B) Signup and view all the answers

How can a defect in the inner membrane of mitochondria cause limited exercise ability in individuals?

A less convoluted inner membrane has less surface area available to create the proton electrochemical gradient needed for ATP production (A) Signup and view all the answers

A cell biologist has developed a drug that interferes with vesicle transport at the cis face of the Golgi apparatus. Upon which process will this drug have an effect?

The movement of materials from the Golgi apparatus to the plasma membrane (A) Signup and view all the answers

During the citric acid cycle, more free energy is released than during glycolysis. However, only 1 molecule of ATP is produced for each molecule of acetyl CoA that enters the cycle. What happens to the remaining free energy?

Lost as heat (D) Signup and view all the answers

In the reaction: Pyruvate + CoA + NAD+ → Acetyl CoA + CO2 + NADH, which molecules are oxidized and reduced?

Pyruvate is oxidized and NAD+ is reduced (D) Signup and view all the answers

Steroid/Cholesterol Deficiency Effect

Reduced movement in cells.

Steroid/Cholesterol Deficiency in Cold

Increased membrane rigidity and potential breakage.