AnswersBiologyThe Chemistry of Life

Practice Test Answers

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1
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Where does a peptide bond form?

A
between the R group of one amino acid and the carboxyl group of another amino acid
B
between the nitrogenous base of one nucleotide and the phosphate group of another nucleotide
C
between the amino group of one amino acid and the carboxyl group of another amino acid
D
between the five-carbon sugar of one nucleotide and the phosphate group of another nucleotide
2
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What scientific knowledge about macromolecules is a direct result of Gerardus Johnannes Mulder’s 1838 discovery?

A
All carbohydrates contain carbon, hydrogen, and oxygen.
B
The helical structure of DNA is essential for protein production.
C
All proteins contain carbon, hydrogen, oxygen, and nitrogen.
D
Nucleic acids are polymers with nucleotide monomers.
3

What type of lipid is estrogen?

A
phospholipid
B
triglyceride
C
wax
D
steroid
4

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

A
the amount of product
B
the concentration of reactants
C
the amount of substrate
D
the activation energy
5

In which part of the body is glycogen stored?

A
liver
B
pancreas
C
blood
D
exoskeleton
6

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 atoms have a lower mass than oxygen atoms.
B
Hydrogen atoms make up more of water's mass than oxygen atoms.
C
Hydrogen is a gas, but oxygen is a solid.
D
Hydrogen is present as single atoms and oxygen is bonded in compounds.
7

Which statement describes one way that RNA differs from DNA?

A
One provides energy, and the other carries genetic information.
B
They are both carbohydrates, but one is a polysaccharide.
C
They contain different five-carbon sugars and a different nitrogenous base.
D
One is a protein, and the other is a nucleic acid.
8

Which reaction is exothermic?

A
a reaction that requires an activation energy
B
a reaction that absorbs energy from the environment
C
a reaction that releases energy into the environment
D
a reaction that does not involve a change in energy
9

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 compounds made of the same two elements, but each contain different numbers of atoms.
B
They are two different types of molecules that each contain the same number of atoms.
C
They are matter made of the same two compounds, but each contain different types of elements.
D
They are two different types of atoms that are each made up of a different number of elements.
14

What would most likely happen to plants if they did not have a waxy outer coating?

A
They would store more sugars in their leaves.
B
They would photosynthesize at a faster rate.
C
They would be harmed by insects and UV radiation.
D
They would store more water in their leaves.

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