Interactions of Macromolecules and Cellular Functions SB1c

Front

What is the structure of DNA and why does it remain in the nucleus?

Back

DNA is double stranded and is not able to exit through the nuclear pores of the nuclear envelope.

Front

What makes the plasma membrane semi-permeable?

Back

Hydrophobic fatty acids tails of phospholipids facing towards the center of the cell membrane create a protective barrier which only allows some substances to pass freely into the cell, while restricting others.

Front

What characteristic of RNA allows it to perform its role in cellular functions?

Back

RNA is single-stranded and is able to fit through the nuclear pores to carry DNA's message outside the nucleus to direct protein synthesis.

Front

Why is glucose considered a quick energy source for cellular respiration?

Back

Glucose is a monomer which allows it to be broken down rapidly as a quick energy source.

Front

Which polysaccharide is best for energy storage in plants and why?

Back

Amylose because it forms a helix (spiral), it packs tightly into the cell and breaks down more slowly.

Front

What are macromolecules?

Back

Macromolecules are large, complex molecules that are essential for life, including carbohydrates, proteins, lipids, and nucleic acids.

Front

What role do phospholipids play in cell membranes?

Back

Phospholipids form the bilayer of cell membranes, providing structure and regulating the movement of substances in and out of the cell.

Front

What is the function of ribosomes in cells?

Back

Ribosomes are the sites of protein synthesis, where RNA is translated into proteins.

Front

How do enzymes affect biochemical reactions?

Back

Enzymes act as catalysts that speed up biochemical reactions by lowering the activation energy required.

Front

What is the difference between DNA and RNA?

Back

DNA is double-stranded and contains deoxyribose sugar, while RNA is single-stranded and contains ribose sugar.