Keystone Homework #3

The chart shows some properties of the element carbon . Which property is most responsible for carbon’s ability to form complex biological macromolecules?

• number of neutrons

• number of protons

• number of electrons

• atomic masses of stable isotopes

The diagram shows a bone and some of its components . Which statement best describes a relationship among some of these components?

• Marrow is an organ in the skeletal system .

• Marrow is a tissue that contains different types of cells .

• Red blood cells, white blood cells, and platelets perform the same function .

• Red blood cells, white blood cells, and platelets together form an organ system

Which statement correctly describes how a protein is formed?

• A monosaccharide bonded to a side chain is broken apart .

• Amino acids are bonded together in a long chain to form a new molecule .

• A molecule containing glycerol bonded to three fatty acids is broken apart .

• A nitrogenous base, a sugar, and a phosphate group combine to form a new molecule

Lungs and capillaries both have porous linings that allow certain substances to move into or out of the structures. Which function do these porous linings most likely serve in living organisms?

• heat release

• gas exchange

• carbohydrate absorption

• osmotic pressure regulation

Which process best describes the assembly of proteins from amino acids?

• Atoms are linked to form a compound.

• Monomers are linked to form a polymer.

• Atoms are added to a monomer until it becomes a polymer.

• Molecules are added to a compound until it becomes a monomer.

Which statement correctly describes how a protein is formed?

• A monosaccharide bonded to a side chain is broken apart.

• Amino acids are bonded together in a long chain to form a new molecule.

• A molecule containing glycerol bonded to three fatty acids is broken apart.

• A nitrogenous base, a sugar, and a phosphate group combine to form a new molecule.

The opening of the stomata allows water to evaporate from inside the leaf in a process known as transpiration. As this occurs, water molecules cling to one another and pull water in a continuous stream up the stem of the plant from the roots to the leaves. Which property of water makes this movement possible?

• cohesion

• freezing point

• high specific heat

• temperature-dependent density

Which of the following is a property of water that allows a water strider to walk on the surface of water?

• solubility

• cohesion

• high specific heat

• low freezing point