u3 l2 - chemistry of life

Why are carbohydrates important to cell processes?

• They make amino acids.
• They form cell membranes.
• They are a source of energy
• They help chemical processes happen.

Ms. Salis explains to her class that sodium (Na) and chlorine (Cl) atoms bond to make table salt (NaCl). Which is the best description of table salt?

• It is a cell.
• It is an atom.
• It is an element.
• It is a compound.

Which of these is one of the six most common elements found in the human body?

• iron
• helium
• oxygen
• water

Alejandro is doing a science experiment. He is given a substance made up of one of the four main types of molecules found in the cells of living things. He notices that the substance does not mix with water.  Based on the fact that it does not mix with water, what can Alejandro conclude about the molecule?

• It is a lipid.
• It is a protein.
• It is a nucleic acid.
• It is a carbohydrate.

DNA stores genetic information. What type of molecule is DNA?

• lipid
• protein
• nucleic acid
• carbohydrate

A structure that separates the inside of the cell from the environment

• nucleus
• cytoskeleton
• cell membrane
• genetic material

Which molecules make up proteins?

• amino acids
• nucleic acids
• phospholipids
• carbohydrates

What is the difference between eukaryotic and prokaryotic cells?

• only prokaryotic cells have cytoplasm
• only eukaryotic cells have a cell membrane
• only prokaryotic cells have genetic material
• only eukaryotic cells have membrane bound organelles

All living things are made of one or more cells.  What is true of all cells?

• they all have cytoplasm
• they all have DNA in their nucleus
• they all have organelles bound by membranes
• they all have DNA in their cytoplasm

The smallest unit of an element that maintains the properties of that element

• an atom
• a molecule
• a protein
• a carbohydrate