Macromolecules EOC REVIEW DAY 1

Macromolecules EOC REVIEW DAY 1

9th Grade

28 Qs

quiz-placeholder

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Macromolecules EOC REVIEW DAY 1

Macromolecules EOC REVIEW DAY 1

Assessment

Quiz

Biology

9th Grade

Medium

NGSS
HS-LS1-1, HS-LS3-1, MS-LS1-7

+3

Standards-aligned

Created by

Tyler Forney

Used 2+ times

FREE Resource

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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