Regarding atoms, identify which statement below is correct.

  1. The number and arrangement of electrons in an atom governs its chemical activity.

  2. The nucleus of an atom contains protons and electrons.

  3. The positive charges of an element are carried by the electrons.

  4. The neutral charges of an element are carried by the protons

  5. An element may be composed of several types of atoms

Answer:

A

An atom is comprised of subatomic particles. The protons bear a positive charge, are found in the nucleus, and their number creates the atomic number assigned to that element. The neutrons are found in the nucleus as well and they with the protons create the majority of an atom's mass. The electrons bear a negative charge and govern the elements reactivity.

Humans store their polysaccharides in the form of ___________.

  1. cellulose

  2. glycogen

  3. glucose

  4. lactose

  5. starch

Answer:

B

Glycogen is a type of polysaccharide used to store sugar in animals.

The figure below is depicting the interaction of water molecules with one another which involves the use of ________.

  1. hydrogen bonds

  2. solvents

  3. valence shells

  4. covalent bonds

  5. ionic bonds

Answer:

A

The positive hydrogen forms a hydrogen bond with the negative oxygen from a nearby molecule. No electron transfer or sharing is occurring in this type of bond. It is a weak attraction between polar molecules.

A tropical forest and desert would be examples of

  1. communities

  2. populations

  3. biomes

  4. ecosystem

  5. biospheres

Answer:

C

Atoms that bear a positive or negative charge are known as

  1. lacking nuclei

  2. magnetic

  3. ions

  4. electrically neutral

Answer:

C

The nucleus of an atom is composed of two subatomic particles, ______________ and _____________.

  1. protons, neutrons

  2. protons, electrons

  3. neutrons, electrons

Answer:

A

Select the INCORRECT association.

  1. sucrose….table sugar

  2. Starch….a long chain of glucose

  3. fructose….a polysaccharide

  4. glucose….monosaccharide

  5. cellulose….building block for cell walls in plants

Answer:

C

Fructose is a monosaccharide. Polysaccharides include materials such as cellulose, starch, and glycogen.

Which of the following would describe a polypeptide?

  1. amino acids joined by dehydration synthesis reactions

  2. a repeated sequence of carbon and hydrogen atoms

  3. nucleotides broken by hydrolysis reactions

  4. glucose molecules joined by dehydration synthesis reactions

  5. fatty acids joined to glycerol by hydrolysis reactions

Answer:

A

A polypeptide is a chain of amino acids joined by a peptide bond. These bonds form by a dehydration synthesis reaction.

Atherosclerosis is associated with __________________.

  1. phospholipids

  2. fats with no double bonds

  3. polyunsaturated fats

  4. fats with double bonds

  5. long protein chains

Answer:

B

Saturated fats have no double bonds between the carbon atoms. They are linked to the promotion of a build up of fat material known as plaque in a person's blood vessels in a disease known as atherosclerosis.

In 1859, naturalist ______________ suggested an explanation for why evolution occurs.

  1. Robert McKormick

  2. Thomas Malthus

  3. Peter Grant

  4. Charles Darwin

  5. Charles Lyell

Answer:

D