Chapter 2 Section 3 Review Questions

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| By Biancabrandon

Biancabrandon

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Quizzes Created: 3 | Total Attempts: 1,031

Questions: 8 | Attempts: 313 | Updated: Mar 20, 2023

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Use this quiz as a review for exam 3. Exam 3 includes material from ALL of chapter 2 (sections 1 through 4).

Questions and Answers

1.

Examples of large complex molecules formed by joining together many small molecules include
- A.
  
  Proteins and amino acids
- B.
  
  Carbohydrates and monosaccharides
- C.
  
  DNA and proteins
- D.
  
  Mitochondria and vacuoles
Correct Answer
C. DNA and proteins

Explanation
DNA and proteins are examples of large complex molecules formed by joining together many small molecules. DNA is composed of nucleotides, which are small molecules consisting of a sugar, a phosphate group, and a nitrogenous base. These nucleotides are joined together through phosphodiester bonds to form a long strand of DNA. Proteins, on the other hand, are composed of amino acids, which are small molecules consisting of an amino group, a carboxyl group, and a side chain. Amino acids are joined together through peptide bonds to form a polypeptide chain, which then folds into a functional protein.

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2.

Which formula on page 57 of the text represents an amino acid?
- A.
  
  Formula A
- B.
  
  Formula B
- C.
  
  Formula C
- D.
  
  Formula D
Correct Answer
C. Formula C
3.

Which type of molecule is represented by formula D on page 57 in the text?
- A.
  
  Amino acid
- B.
  
  Monosaccharide
- C.
  
  Disaccharide
- D.
  
  Protein
Correct Answer
C. Disaccharide

Explanation
The correct answer is disaccharide. This means that the molecule represented by formula D on page 57 in the text is a disaccharide.

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4.

Proteins are large, organic molecules formed by joining together
- A.
  
  Fats
- B.
  
  Carbohydrates
- C.
  
  Amino acids
- D.
  
  Simple sugars
Correct Answer
C. Amino acids

Explanation
Proteins are large, organic molecules formed by joining together amino acids. Amino acids are the building blocks of proteins, and when they are linked together through peptide bonds, they form long chains called polypeptides. These polypeptides then fold into specific three-dimensional structures, giving proteins their unique functions. Fats and carbohydrates are also organic molecules, but they do not form proteins. Simple sugars, on the other hand, are monosaccharides and are not directly involved in protein synthesis.

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5.

A protein that acts as a biological catalyst is a(n)
- A.
  
  Enzyme
- B.
  
  Fat
- C.
  
  Hormone
- D.
  
  Simple sugar
Correct Answer
A. Enzyme

Explanation
Enzymes are proteins that act as biological catalysts, meaning they speed up chemical reactions in living organisms. They do this by lowering the activation energy required for a reaction to occur, allowing it to happen more quickly. Enzymes are highly specific, meaning they only catalyze specific reactions. They are not fats, hormones, or simple sugars, which have different functions in the body. Therefore, the correct answer is enzyme.

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6.

Which is NOT an organic molecule found in living organisms?
- A.
  
  Protein
- B.
  
  Sugar
- C.
  
  Water
- D.
  
  Carbohydrate
Correct Answer
C. Water

Explanation
Water is not considered an organic molecule because it does not contain carbon. Organic molecules are defined as compounds that contain carbon and hydrogen atoms bonded together in a specific way. Water, on the other hand, consists of hydrogen and oxygen atoms, making it an inorganic molecule. Despite being essential for life, water is not classified as an organic molecule.

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7.

In living organisms, the millions of organic compounds are classified into groups. For example, lipids are a large and varied group of organic compounds that include fats, oils, and waxes. Name three other groups of organic compounds. Describe the compounds and their monomers, and explain why each group of compounds is important. Give examples of each
8.

Which class period are you in?
- A.
  
  1
- B.
  
  4
- C.
  
  7
- D.
  
  8

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Current Version
Mar 20, 2023

Quiz Edited by
ProProfs Editorial Team
Oct 02, 2011

Quiz Created by
Biancabrandon

Chapter 2 Section 3 Review Questions

Examples of large complex molecules formed by joining together many small molecules include

Which formula on page 57 of the text represents an amino acid?

Which type of molecule is represented by formula D on page 57 in the text?

Proteins are large, organic molecules formed by joining together

A protein that acts as a biological catalyst is a(n)

Which is NOT an organic molecule found in living organisms?

Which class period are you in?