Macromolecules EOC REVIEW DAY 1

Quiz
•
Biology
•
9th Grade
•
Medium
+3
Standards-aligned
Tyler Forney
Used 2+ times
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28 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following macromolecules serves as the primary source of energy in most living organisms?
Proteins
Lipids
Carbohydrates
Nucleic Acids
Answer explanation
Carbohydrates are the primary source of energy for most living organisms, as they are easily broken down into glucose, which fuels cellular processes. Proteins and lipids serve other functions, while nucleic acids are involved in genetic information.
Tags
NGSS.MS-LS1-7
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which macromolecule contains the elements carbon (C), hydrogen (H), and oxygen (O) in a ratio of approximately 1:2:1?
Lipids
Carbohydrates
Nucleic Acids
Proteins
Answer explanation
Carbohydrates are macromolecules that consist of carbon, hydrogen, and oxygen in a 1:2:1 ratio, making them distinct from lipids, nucleic acids, and proteins, which have different elemental compositions.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A molecule of DNA is made up of repeating subunits known as nucleotides. Which of the following components is NOT part of a nucleotide?
A phosphate group
A nitrogenous base
A glycerol molecule
A five-carbon sugar
Answer explanation
A nucleotide consists of a phosphate group, a nitrogenous base, and a five-carbon sugar. A glycerol molecule is not part of a nucleotide, making it the correct choice for this question.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Lipids are hydrophobic molecules. Which statement explains why this is the case?
Lipids are nonpolar and cannot form hydrogen bonds with water.
Lipids are composed primarily of carbohydrates, which repel water.
Lipids dissolve easily in water due to their structure.
Lipids have a high affinity for polar substances like water.
Answer explanation
Lipids are nonpolar molecules, meaning they do not have charged regions. This prevents them from forming hydrogen bonds with water, making them hydrophobic. Thus, the correct statement is that lipids cannot form hydrogen bonds with water.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Proteins are composed of amino acids. What is the bond that links amino acids together in a protein?
Ionic bond
Hydrogen bond
Peptide bond
Phosphodiester bond
Answer explanation
Amino acids are linked together in proteins by peptide bonds, which form through a dehydration reaction between the amino group of one amino acid and the carboxyl group of another. This is the correct bond type.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In a hypothetical scenario, a student isolates a macromolecule that contains the elements carbon, hydrogen, oxygen, nitrogen, and phosphorus. Which macromolecule could this be?
Carbohydrate
Protein
Lipid
Nucleic Acid
Answer explanation
The presence of carbon, hydrogen, oxygen, nitrogen, and phosphorus indicates a nucleic acid, as these elements are key components of DNA and RNA. Carbohydrates, proteins, and lipids do not contain phosphorus.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which macromolecule is responsible for speeding up chemical reactions in cells by acting as a biological catalyst?
Carbohydrates
Nucleic Acids
Enzymes (Proteins)
Lipids
Answer explanation
Enzymes, which are proteins, act as biological catalysts that speed up chemical reactions in cells. They lower the activation energy required for reactions, making them essential for various cellular processes.
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