Cell Structure and Function

Which of the following best describes the structure of ribosomes?

• Surrounded by a membrane
• Made of DNA and lipids
• Composed of RNA and proteins
• Composed of carbohydrates and DNA

Which part of the chloroplast is analogous to the mitochondrial matrix?

• Thylakoid
• Grana
• Stroma
• Outer membrane

What is the main difference between 70S and 80S ribosomes?

• Location in the cell
• Type of RNA
• Function
• Subunit composition

Which statement correctly describes the permeability of chloroplast membranes?

• Outer membrane is less permeable
• Both membranes are equally permeable
• Inner membrane is more permeable
• Inner membrane is less permeable

Which of the following is a characteristic of chloroplasts but NOT mitochondria?

• Double membrane
• Own DNA
• Own ribosomes
• Presence of thylakoids