AP Biology Unit 2 Cell Structure & Function

What are ribosomes composed of?

• DNA and protein

• RNA and protein

• Lipids and carbohydrates

• DNA and RNA

Tags

NGSS.HS-LS1-6

Smooth ER functions include ______.

• A) Protein synthesis

• B) Lipid synthesis

• C) DNA replication

• D) Photosynthesis

Mitochondria have a ______ membrane.

• Single

• Double

• Triple

• Quadruple

Which of the following is a limitation of cell size and shape?

• A) Restriction by surface area-to-volume ratio

• B) Unlimited growth

• C) Constant shape

• D) No limitations

The role of phospholipids in the cell membrane is (a)  

• Only hydrophilic
• Only hydrophobic
• Both hydrophilic and hydrophobic
• Neither hydrophilic nor hydrophobic

(a)   is a direct consequence of membrane structure according to the fluid mosaic model.

• Increased rigidity
• Selective permeability
• Decreased flexibility
• Uniformity

What type of molecules pass through the membrane in small amounts?

• Large polar molecules

• Polar uncharged molecules

• Ions

• Proteins

Match the following descriptions with the orientation of phospholipids in the cell membrane.

• Hydrophilic heads face this direction

• Away from the aqueous environment

• Alignment along the plane of the membrane

• Parallel to the membrane.

• Hydrophobic tails face this direction

• Toward the aqueous environment

• Orientation is not specific

• Random

The structural framework of cell membranes includes phospholipids and ____.

• DNA

• RNA

• Proteins

• Sugars

Which of the following is NOT a requirement for active transport?

• A) Metabolic energy

• B) Membrane proteins

• C) Concentration gradient

• D) Aquaporins