AnswersPA Human Anatomy Physiology A 2026-2027 SMITH ICCatalysts

Catalysts — Unit test Answers

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1
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Which best describes a codon?

A
a cell structure that gives the master instructions for an organism
B
a segment of DNA that is the basis of heredity in organisms
C
the sequence of three bases that codes for a specific amino acid
D
the basic unit of structure and function of all living things
2
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Which statement describes how enzymes and substrates are related?

A
The enzyme influences the speed of change from substrate to product.
B
Enzymes are released as substrates in a chemical reaction.
C
An enzyme is a special kind of substrate in a chemical reaction.
D
Substrates combine with enzymes to form reactants.
3

Photo 51 is a picture of the structure of DNA that was used to create a model of DNA. Who created the photo?

A
James Watson and Francis Crick
B
Erwin Chargaff
C
Rosalind Franklin
D
Friedrich Miescher
4

What does DNA provide the code for?

A
nitrogenous base pairing
B
protein synthesis
C
deoxyribose formation
D
nucleotide synthesis
5

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

A
the amount of substrate
B
the activation energy
C
the amount of product
D
the concentration of reactants
6

How does a catalyst influence a chemical reaction?

A
It speeds up or slows down a chemical reaction by direct participation.
B
It reacts with products to increase the concentration of reactants.
C
It decreases the amount of energy necessary for the reaction to proceed.
D
It increases the total amount of products formed.
7

Which is not something that occurs in translation?

A
A codon and an anticodon pair.
B
A peptide bond is created.
C
A molecule of mRNA is formed.
D
An amino acid is added to a polypeptide.
8

Which flow chart correctly organizes the structures of heredity, from least to most complex?

A
codon ® gene ® DNA ® chromosome
B
gene ® chromosome ® codon ® DNA
C
DNA ® codon ® chromosome ® gene
D
chromosome ® DNA ® gene ® codon
9

A strand of DNA contains the bases adenine, cytosine, cytosine, and guanine, in that order. Which would be the order of the bases on the opposite strand of DNA?

A
cytosine, adenine, adenine, and thymine
B
cytosine, thymine, thymine, and adenine
C
thymine, guanine, guanine, and cytosine
D
thymine, adenine, adenine, and cytosine
10

Which reaction is exothermic?

A
a reaction that absorbs energy from the environment
B
a reaction that requires an activation energy
C
a reaction that releases energy into the environment
D
a reaction that does not involve a change in energy
11

The structure of DNA resembles a twisted ladder. Which structural components form the rungs of the ladder?

A
deoxyribose sugars
B
phosphate groups
C
nitrogenous base pairs
D
ribosomes

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