BIOLOGY 1610 FINAL USU

BIOLOGY 1610 FINAL USU

The most common isotope of hydrogen has one proton, no neutrons, and one electron. An isotope of hydrogen with 1 neutron would have: - ANSWERan atomic number of 1 and a mass number of 2 In a covalent bond: - ANSWERelectrons are shared between atoms so that all atoms have full outer shells A property of a system that is present at one level of organization but absent at the levels below is

called: - ANSWERan emergent property

An ionic bond is - ANSWERweaker than a covalent bond Modern taxonomy attempts to group organisms according to: - ANSWERevolutionary history The half-life of carbon 14 is 5,730 years. If you have a piece of wood in which 2% of the carbon is carbon- 14, and you bury it underground. Which of the following statements is TRUE? - ANSWERAfter 5,730 years, 1% of the carbon would be carbon-14.Nitrogen has an atomic number of 7. This means that: - ANSWERnitrogen has 3 electrons missing from its outer shell The best description of the bond that binds hydrogen and oxygen together to create a water molecule

is: - ANSWERa polar covalent bond

The annual temperature range of Logan is larger than that of San Francisco largely because: - ANSWERwater has a high specific heat 1 / 4

Ice floats because: - ANSWERhydrogen bonding forces water molecules apart when water freezes Which of the following statements about hydrogen bonds is FALSE?

• In a hydrogen bond, carbon and hydrogen are positively charged because they attract electrons

weakly.

• Hydrogen bonds can form between two molecules.
• Hydrogen bonds are formed when hydrogen shares electrons to form an ionic bond.
• In a hydrogen bonds, oxygen and nitrogen are negatively charged because they attract electrons

strongly.

• Hydrogen bonds are much weaker than covalent bonds. - ANSWERHydrogen bonds are formed when

hydrogen shares electrons to form an ionic bond.A solution with 10 times more hydrogen ions than a solution with a pH of 5 would have a pH of: -

ANSWER4

A prion is a: - ANSWERProtein

Which of the following is a polymer of glucose?

• glycogen
• glycerol
• a monosaccharide
• a polypeptide chain
• sucrose - ANSWERglycogen

Unsaturated fats:

• are produced mainly by animals
• contain only two fatty acids 2 / 4

• are generally liquid at room temperature
• do not contain fatty acids
• do not contain glycerol - ANSWERare generally liquid at room temperature

Phospholipids form bilayers because:

• the fatty acids contain phosphates instead of hydrogens
• phospholipids are polymers of fatty acids
• the entire molecule is hydrophobic
• one end of the molecule is hydrophobic; the other end is hydrophilic
• they hydrogen bond with water which holds them in straight lines - ANSWERone end of the molecule

is hydrophobic; the other end is hydrophilic

A nucleotide is made up of:

• a central carbon and an R group
• a sugar, an amino group, and a nitrogenous base
• amino acids attached to one another
• a carboxyl group, an an amino group, and an R group
• a sugar, a phosphate, and a nitrogen-containing base - ANSWERa sugar, a phosphate, and a nitrogen-

containing base Which of the following statements about protein structure is TRUE?

• An alpha-helix is an example of tertiary structure
• Tertiary structure is determined by interactions among R-groups.
• All proteins have quaternary structure.
• A pleated sheet is an example of primary structure. 3 / 4

• The same protein can have different primary structures - ANSWERTertiary structure is determined by

interactions among R-groups.Which of the following statements about polymers is TRUE?

• Polymers of carbohydrates are formed by a dehydration reaction.
• A protein is a polymer of nucleic acids
• A monomer is a long molecule made up of repeated units called polymers.
• All biological molecules are made up of polymers.
• A nucleic acid is a polymer of amino acids. - ANSWERPolymers of carbohydrates are formed by a

dehydration reaction.

An amino acid contains:

• an amino group and a phosphate group
• an amino group and a carboxyl group
• a sugar and a nitrogen-containing base
• a phosphate group and a carboxyl group
• an amino group and a sugar - ANSWERan amino group and a carboxyl group

Which of the following statements about cellulose is TRUE?

• Plants use cellulose primarily for energy storage.
• Cellulose is a polymer of amino acids
• Cellulose forms helices
• Animals store energy as cellulose
• The primary function of cellulose is support - ANSWERThe primary function of cellulose is support

Starch and cellulose have different properties because:

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