Mid-Term Review

What is homeostasis?

• The process by which organisms maintain a stable internal environment

• The evolution of species over time

• The bonding of water molecules

• The age of the first life on Earth

Which subatomic particle has a positive charge?

• Electrons

• Neutrons

• Protons

• Isotopes

What is the importance of DNA?

• It carries the genetic instructions for the development and function of living things

• It is the primary source of energy for cells

• It is the main structural component of cell membranes

• It is responsible for the transport of oxygen in the blood

What type of bond is responsible for the unique properties of water?

• Ionic bond

• Covalent bond

• Hydrogen bond

• Metallic bond

Which of the following is not a macromolecule?

• Proteins

• Carbohydrates

• Lipids

• Salts

___________ are the building blocks of life.

• cells
• legos
• blocks
• blood

water moves from

• higher conc. H20 => lower conc H20
• lower conc. H20 => higher conc. H20

What is the MINIMUM amount of cells an organism must have to be considered living

• 1

• 2

• 3

• 4

Which term means "water-fearing"?

• Adhesion
• Polar
• Hydrophilic
• Hydrophobic

Which type(s) of cells contain DNA

• plant cells
• animal cells
• bacteria cells
• all cells