Question

this macromolecule is insoluble in water, acts as long - term energy storage, and forms our cell membranes.
a proteins
b lipids
c carbohydrat
question 9
1 point
which one of the following is a function of carbohydrates?
a speeds up the rate of chemical reactions
b passes instructions from parent cells to offspring
c provides fast energy to cells

Explanation:

• First question:
• Proteins (A) have functions like being enzymes (speeding up reactions), structural support, etc., but they are not mainly for long - term energy storage and forming cell membranes in the way described.
• Lipids (B) are insoluble in water. Triglycerides (a type of lipid) act as long - term energy storage, and phospholipids (a type of lipid) are a major component of cell membranes.
• Carbohydrates (C) are usually for short - term energy (like glucose) and structural purposes (like cellulose in plants), not the properties described in the first question.
• Second question:
• Option A (speeding up the rate of chemical reactions) is a function of enzymes (which are proteins).
• Option B (passing instructions from parent cells to offspring) is a function of nucleic acids (like DNA).
• Carbohydrates, especially simple sugars like glucose, are broken down quickly in cellular respiration to provide fast energy to cells (Option C).

Answer:

First question: B. lipids
Second question: C. provides fast energy to cells