Quiz CH2

Monomers of carbohydrates are: amino acids monosaccharides disaccharides fatty acids

monosaccharides

Monomers of proteins are... amino acids monosaccharides disaccharides fatty acids

amino acids

People who are lactose intolerant... cannot digest proteins cannot manufacture lactose cannot manufacture lactase all of the above

cannot manufacture lactase

Organic substances always contain the elements hydrogen and __________.

carbon

An element with the atomic number 6 would contain.... 12 protons. 6 protons. 3 protons and 3 neutrons. 0 protons.

6 protons.

The midpoint of the pH scale is pH ____.

7

Which of the following substances is an element? iron carbon oxygen All of these.

All of these.

A substance that releases hydrogen ions in water is a base. True False

False

An atom that has gained or lost electrons is called an ion. True False

True

The formula H20 means.... an atom contains 2 hydrogen molecules and 1 oxygen molecule. an atom contains 1 hydrogen molecule and 2 oxygen molecules. a molecule contains 2 hydrogen atoms and 1 oxygen atom. a molecule contains 1 hydrogen atom and 2 oxygen atoms.

a molecule contains 2 hydrogen atoms and 1 oxygen atom.

Which of the following substances comprise over 95% of the human body? carbon, hydrogen, oxygen, nitrogen calcium, hydrogen, oxygen, nitrogen carbon, phosphorus, oxygen, hydrogen calcium, phosphorus, hydrogen, nitrogen

carbon, hydrogen, oxygen, nitrogen

The type of chemical bond formed when atoms share electrons is called _______________.

covalent

Long chains of macromolecules are held together by.... ionic bonds polar bonds hydrogen bonds covalent bonds

covalent bonds

Fatty acids are monomers of... proteins lipids carbohydrates nucleic acids

lipids

If an atom has 3 electrons in its second shell, and its first shell is filled, it will tend to.... lose 3 electrons from its second shell. lose all of the electrons from its first shell. lose all of the electrons from its first and second shells. gain 2 electrons in its second shell.

lose 3 electrons from its second shell.

A person has alkalosis if the blood pH.... rises above 7.0. drops below 7.0. rises above 7.4. drops below 7.4.

rises above 7.4.

The difference in hydrogen ion concentration between solutions with pH 4 and pH 5 is.... twofold. fivefold. tenfold. twentyfold.

tenfold.