Key Concepts Quiz
This activity contains 19 questions.
Which of the following statements about carbon skeletons is true?
Carbon skeletons are always linear and never branched.
The length of carbon skeletons is always the same; it is the attachments that differentiate molecules.
Carbon skeletons only contain double bonds.
Carbon skeletons may be arranged in rings.
What does the term
signify about the structure of the molecule?
It consists of an amino group only.
It consists of an amino group and a carbonyl group.
It consists of an amino group and a carboxyl group.
It consists of a carboxyl group only.
Dehydration reactions _____. They do so by _____.
link monomers to form a polymer … adding a water molecule
remove monomers from polymers … adding a water molecule
link monomers to form a polymer … removing a water molecule
remove monomers from polymers ... removing a water molecule
The reaction that joins two monomers to form a polymer is known as a _____ reaction. The molecule of water formed is due to the interaction between _____ and a hydrogen ion.
dehydration … a carboxyl group
hydrolysis … a carboxyl group
dehydration … a hydroxyl group
hydrolysis … a hydroxyl group
A molecule with the formula C
possibly glucose or fructose
possibly glucose, fructose, or lactose
A polysaccharide called starch consists entirely of glucose molecules. During early stages of starch digestion, starch would be broken down into _____.
Which of the following would bind to a sweet receptor most tightly?
malted milk shake
Which of the following foods would contain the most starch?
Which of the following foods contain(s) fats that would have at least one double bond in their carbon skeleton?
The oil and vinegar in your salad dressing remain separate from one another due to the _____ properties of the oil.
What do phospholipids and cholesterol have in common?
Both are steroids.
Both groups of lipids contain human sex hormones.
Both are important components of cell membranes.
Both contain glycerol and two fatty acid groups.
Anabolic steroids are prescribed to _____.
athletes who need a competitive edge
patients suffering from high blood cholesterol levels
overweight individuals who are not healthy enough for vigorous exercise
people who suffer from muscle-debilitating diseases
When calorie intake is low, proteins are the last resource the body uses for fuel. Which statement below gives the best reason for this?
There are few proteins in the body.
Proteins produce little usable energy when metabolized.
We ingest a very small amount of protein every day.
When the body uses proteins as fuel, it is breaking down substances vital to its structure and essential functions.
Which of the following amino acids is hydrophobic?
Which condition is irrelevant, to some extent, to the maintenance of protein structure in your body?
Which statement correctly describes bonds of the secondary structure of proteins?
Disulfide bridges form at the secondary level.
Secondary structure involves hydrogen bonding between atoms of the polypeptide backbone.
Secondary structure involves bonding between atoms of the R groups of the amino acid subunits.
Secondary structure involves the association of polypeptide chains, or subunits.
Linus Pauling made significant contributions to our understanding of enzyme structure and chemical bonding. However, his theory regarding DNA was wrong because he proposed that _____.
DNA consists of a triple helix structure
DNA consists of a double helix structure
DNA is a protein
DNA is made of more than four types of monomers
When an RNA strand forms using DNA as a template, _____.
adenine pairs with cytosine and guanine pairs with thymine
guanine pairs with adenine and thymine pairs with uracil
uracil pairs with adenine and cytosine pairs with guanine
thymine pairs with cytosine and adenine pairs with guanine
DNA nucleotides are composed of _____.
ribose sugars, which are attached to a phosphate group, which is bonded to a nitrogenous base
deoxyribose sugars, which are attached to a phosphate group, which is bonded to a nitrogenous base
deoxyribose sugars, which are bonded to a phosphate group and a nitrogenous base
ribose sugars, which are bonded to a phosphate group and a nitrogenous base
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