Which of the following is TRUE?

The sequence of amino acids makes up the primary shape. The polypeptide chains fold into 3-dimensional shapes that make up various structures.

The amino acids primary shape is a 3-D structure.

Carbohydrates form polypeptide chains.

Which of the following is NOT made up primarily of proteins?

Transport molecules (including Hemoglobin)

Protein -- A Macromolecule

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| By Kwchiro

Kwchiro

Community Contributor

Quizzes Created: 40 | Total Attempts: 389,188

Questions: 6 | Attempts: 198 | Updated: Mar 21, 2023

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Basic information about proteins. (9th grade biology)

Questions and Answers

1.

What elements are found in all proteins?
- A.
  
  C, H, O, only
- B.
  
  C, H, O and N
- C.
  
  C, H, O, P
- D.
  
  C, H, O, S
Correct Answer
B. C, H, O and N

Explanation
C, H, O (Carbon, Hydrogen and Oxygen) are in all Carbohydrates and Lipids.
Proteins need: C, H, O and Nitrogen (N) for all monomers of proteins.

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2.

What is a name for a monomer of protein?
- A.
  
  Polypeptide
- B.
  
  Monoscaccharide
- C.
  
  Fatty acid
- D.
  
  Amino acid
Correct Answer
D. Amino acid

Explanation
Amino acids are the building blocks (monomers) of proteins.
Monosaccharides are the building blocks of carbohydrates.

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3.

This is a basic pattern of an amino acid. What does portion A represent?
- A.
  
  Carboxylic acid portion
- B.
  
  Variable portion
- C.
  
  Amine portion
Correct Answer
C. Amine portion

Explanation
Portion A in the basic pattern of an amino acid represents the amine portion. This portion consists of an amino group (-NH2) which is attached to the central carbon atom of the amino acid. The amine portion is responsible for the basic properties of amino acids and plays a crucial role in protein synthesis and structure. It is involved in forming peptide bonds with other amino acids, contributing to the formation of proteins.

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4.

Which of the following is TRUE?
- A.
  
  The sequence of amino acids makes up the primary shape. The polypeptide chains fold into 3-dimensional shapes that make up various structures.
- B.
  
  The amino acids primary shape is a 3-D structure.
- C.
  
  Carbohydrates form polypeptide chains.
- D.
  
  Proteins are flat structures.
Correct Answer
A. The sequence of amino acids makes up the primary shape. The polypeptide chains fold into 3-dimensional shapes that make up various structures.

Explanation
The sequence of amino acids makes up the primary shape. The polypeptide chains fold into 3-dimensional shapes that make up various structures.

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5.

In the lab, how do you test for proteins
- A.
  
  Benedict's test
- B.
  
  Iodine test
- C.
  
  Paper bag/oily test
- D.
  
  Biuret Test
Correct Answer
D. Biuret Test

Explanation
Benedict's tests for simple sugars - example: glucose. Iodine tests for starches. Paper bag (looking for oily stain) is for fats.
Biuret test is for proteins. A positive test will turn the solution from blue to purple.

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6.

Which of the following is NOT made up primarily of proteins?
- A.
  
  Cellulose
- B.
  
  Enzymes
- C.
  
  Bones and Muscles
- D.
  
  Transport molecules (including Hemoglobin)
Correct Answer
A. Cellulose

Explanation
Proteins make up most structures in a living organism. Proteins make up enzymes, collagen, bones, transport molecules, bone and muscle. Cellulose -- which helps to give the plants structure is a polysaccharide -- a chain of glucose molecules. It is NOT a protein.

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Current Version
Mar 21, 2023

Quiz Edited by
ProProfs Editorial Team
May 03, 2019

Quiz Created by
Kwchiro

Protein -- A Macromolecule

What elements are found in all proteins?

What is a name for a monomer of protein?

This is a basic pattern of an amino acid. What does portion A represent?

Which of the following is TRUE?

In the lab, how do you test for proteins

Which of the following is NOT made up primarily of proteins?