AnswersAISD-Biology A CR - 25-26Unit Test

Unit Test — Unit test Answers

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1
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The diagram shows a straight chain of glucose molecules. Which carbohydrate is shown above?

Question illustration
A
fructose
B
sucrose
C
galactose
D
starch
2
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Which statement best describes the diagram below?

Question illustration
A
This is the amino group of an amino acid.
B
This is the R group of an amino acid.
C
A protein has been made from the polymerization of amino acids.
D
A nucleic acid has been made from the polymerization of nitrogenous bases.
3

The brothers pictured below are identical twins.The boys in this picture look alike because their bodies contain identical

Question illustration
A
carbohydrates.
B
lipids.
C
nucleic acids.
D
proteins.
4

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.
5

Which type of macromolecule is made up of subunits that are called amino acids?

A
carbohydrate
B
lipid
C
nucleic acid
D
protein
6

Which answer choice shows the location of a peptide bond in the peptide below?

Question illustration
A
mc014-2.jpg
Option A
B
mc014-3.jpg
Option B
C
mc014-4.jpg
Option C
D
mc014-5.jpg
Option D
7

Which recent discovery led to a new understanding of how genetic mutations increase the risk of cancer?

A
double helix structure of DNA
B
BRCA1 and BRCA2 genes
C
nucleic acid monomers
D
formation of tumor suppressor proteins
8

How are monosaccharides different from disaccharides?

A
Monosaccharides are the simplest carbohydrates. Disaccharides are made up of two monosaccharides.
B
Disaccharides are the simplest carbohydrates. Monosaccharides are made up of two disaccharides.
C
Monosaccharides are the simplest carbohydrates. Disaccharides are made up of three monosaccharides.
D
Disaccharides are the simplest carbohydrates. Monosaccharides are made up of three disaccharides.
9

In which part of the body is glycogen stored?

A
liver
B
blood
C
pancreas
D
exoskeleton
10

A dietician examines the diet of a patient who is complaining that he is unable to build muscle mass. The patient eats mainly fresh fruits, vegetables, pasta, bread, and some fats and oils. Which type of supplement will the dietician most likely recommend?

A
citric acid
B
fatty acids
C
nucleic acids
D
amino acids
11

Sucrose is an organic compound made by plants for quick energy.What type of organic compound is sucrose?

A
protein
B
carbohydrate
C
lipid
D
nucleic acid
12

What is the R group in the amino acid serine?

A
mc009-1.jpg
Option A
B
mc009-2.jpg
Option B
C
mc009-3.jpg
Option C
D
mc009-4.jpg
Option D
13

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
14

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
15

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.

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