Chapter 2: Chemical Level of Organization

Which of the following is an example of a type of chemical bond important for the human body?

All of the above

Which of the following is an important property of chemical reactions?

All of the above

________ reactions release energy.

All of the above

Which of the following statements about chemical bonds is true?

Covalent bonds are stronger than ionic bonds.

Which of the following is false regarding atoms?

Neutrons have a negative charge

Which of the following is NOT an inorganic compound?

Nucleotides

Which of the following are characteristics of water that make it essential for human life?

all of the above

The smallest unit of an element that still retains the distinctive behavior of that element is an ________.

atom

AB→A+B is a general notation for a(n) ________ reaction.

decomposition

A(n) ___________________is a pure substance that is distinguished from all other matter by the fact that it cannot be created or broken down by ordinary chemical means.

element

What organic compound do brain cells primarily rely on for fuel?

glucose

Which of the following is not a pyramidine?

guanine

C6H12O6 is the chemical formula for a ________.

hexose monosaccharide

A ____________________is one of a highly diverse group of compounds made up mostly of hydrocarbons.

lipid

On the periodic table of the elements, mercury (Hg) has an atomic number of 80 and a mass number of 200.59. It has seven stable isotopes. The most abundant of these probably have ________.

more than 80 neutrons each

A molecule of ammonia contains one atom of nitrogen and three atoms of hydrogen. These are linked with ________.

polar covalent bonds

The characteristic that gives an element its distinctive properties is its number of ________.

protons

The ability of an enzyme's active sites to bind only substrates of compatible shape and charge is known as ________.

specificity

Jenny mixes up a batch of pancake batter, then stirs in some chocolate chips. As she is waiting for the first few pancakes to cook, she notices the chocolate chips sinking to the bottom of the clear glass mixing bowl. The chocolate-chip batter is an example of a ________.

suspension

Nitrogen has an atomic number of seven. How many electron shells does it likely have?

two