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Practice Test Answers

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Where does a peptide bond form?

A
between the nitrogenous base of one nucleotide and the phosphate group of another nucleotide
B
between the amino group of one amino acid and the carboxyl group of another amino acid
C
between the five-carbon sugar of one nucleotide and the phosphate group of another nucleotide
D
between the R group of one amino acid and the carboxyl group of another amino acid
4

In which part of the body is glycogen stored?

A
exoskeleton
B
blood
C
pancreas
D
liver
6

What scientific knowledge about macromolecules is a direct result of Gerardus Johnannes Mulder’s 1838 discovery?

A
All proteins contain carbon, hydrogen, oxygen, and nitrogen.
B
The helical structure of DNA is essential for protein production.
C
All carbohydrates contain carbon, hydrogen, and oxygen.
D
Nucleic acids are polymers with nucleotide monomers.
7

A scientist is working with methane open paren CH sub 4 close paren and butane open paren cap c sub 4 cap h sub 10 close paren Which statement best compares these chemicals?

A
They are two different types of molecules that each contain the same number of atoms.
B
They are two different types of atoms that are each made up of a different number of elements.
C
They are matter made of the same two compounds, but each contain different types of elements.
D
They are compounds made of the same two elements, but each contain different numbers of atoms.
8

There are more hydrogen atoms in living organisms than any other atom, but oxygen is more abundant in terms of mass. Why is this statement true?

A
Hydrogen is present as single atoms and oxygen is bonded in compounds.
B
Hydrogen atoms make up more of water's mass than oxygen atoms.
C
Hydrogen atoms have a lower mass than oxygen atoms.
D
Hydrogen is a gas, but oxygen is a solid.
10

What type of lipid is estrogen?

A
steroid
B
triglyceride
C
phospholipid
D
wax
12

Which reaction is exothermic?

A
a reaction that releases energy into the environment
B
a reaction that requires an activation energy
C
a reaction that absorbs energy from the environment
D
a reaction that does not involve a change in energy
13

Which component is affected when a catalyst is added to a chemical reaction?

A
the activation energy
B
the concentration of reactants
C
the amount of substrate
D
the amount of product
14

Which statement describes one way that RNA differs from DNA?

A
One provides energy, and the other carries genetic information.
B
One is a protein, and the other is a nucleic acid.
C
They are both carbohydrates, but one is a polysaccharide.
D
They contain different five-carbon sugars and a different nitrogenous base.

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