Bio 1441 Exam1

What is the function of Lipids?

• Long term energy storage

• Provides energy, stores energy (polys)

• Enzymes, tags, structure-cytoskeleton, transporters

• Genetic information/code

What is the function of carbohydrates?

• Genetic information/code

• Long term energy storage

• Provides energy stores energy (polys)

• Enzymes, tags, structure- cytoskeleton, transporters

What is the function of proteins?

• Provides energy, stores energy (polys)

• Genetic Information/code

• Enzymes, tags, structure-cytoskeleton, transporters

• Long term energy storage

What is the function of Nucleic Acids?

• Enzymes, tags, structures-cytoskeleton, transporters

• Genetic information/code

• Long term energy storage

• Provides energy, stores energy (polys)

What does all cells have? ​ ​ ​ ​ ​

• DNA and RNA
• Plasma Membrane
• Cytoplasm
• Ribosomes
• Nucleus

Is diffusion always passive transport?

• No, diffusion requires energy.

• Yes, diffusion never requires energy.

Does active transport always use a transport protein?

• Yes, active transport always uses a transport protein.

  1. 1. ATP (primary active transport)

  2. 2. Concentration Gradient (secondary active transport)

• No, active transport can occur without a transport protein.

  1. 1. ATP (primary active transport)

  2. 2. Concentration Gradient (secondary active transport)

How would lysine, a positively-charged amino acid, cross the plasma membrane of a cell?

Answer explanation

Through a transporter, facilitated.

When a molecule moves UP and AGAINST its concentration gradient, what type of transport is occurring?

Answer explanation

Active Transport

Which part of the plasma membrane is used to move polar molecules (like glucose) across the plasma membrane?

• Lipid bilayer
• Cholesterol molecules
• Transport proteins (e.g., glucose transporters)
• Cytoskeleton fibers