Question 1

Classification. The following are basic building blocks of biopolymers. Match the building blocks with the statements below.
 
-The basic unit of proteins
A)Amino acid
B)Glucose
C)Carboxyl head
D)Fatty acid tail
E)Nucleotide

Accepted Answer

Amino acids are the basic building blocks of proteins, forming the polypeptide chains through peptide bonds.

Question 2

Which molecule is incorrectly matched with its monomer?  
A) Fat; fatty acid
B) Starch; fructose
C) Protein; amino acid
D) Cellulose; glucose
E) Nucleic acids; nucleotide

Accepted Answer

Starch is a polysaccharide made up of glucose monomers, not fructose.

Question 3

Simple sugar converts from a straight-chain into a ring form when the __________ group combines with a hydroxyl group.  
A) aldehyde
B) sulfhydryl
C) amine
D) carbonyl
E) methyl

Accepted Answer

The answer of Simple sugar converts from a straight-chain into...

Question 4

Classification. The following are basic building blocks of biopolymers. Match the building blocks with the statements below.
 
-The basic unit of DNA
A)Amino acid
B)Glucose
C)Carboxyl head
D)Fatty acid tail
E)Nucleotide

Accepted Answer

The basic unit of DNA is a nucleotide, which consists of a nitrogenous base, a sugar (deoxyribose), and a phosphate group.

Question 5

Classification. The following are chemical functional groups that may be part of a biologically active molecule. Answer the questions by matching the items with the most appropriate group. -The group that makes lipid head's hydrophilic A)-COOH B)-CH₃ C)-NH₂ D)-OH E) F)-PO₄- G)-CHO

Accepted Answer

The answer of Classification. The following are chemical functional groups...

Question 6

Classification. The following are chemical functional groups that may be part of a biologically active molecule. Answer the questions by matching the items with the most appropriate group. -The aldehyde group in simple sugars A)-COOH B)-CH₃ C)-NH₂ D)-OH E) F)-PO₄- G)-CHO

Accepted Answer

The aldehyde group is represented by CHO.

Question 7

Choose the most appropriate description for each item.
-Nucleotides
A)A six-carbon sugar
B)Found in DNA and RNA
C)Principal components of cell membranes
D)Affect metabolic reaction rates

Accepted Answer

Nucleotides are the building blocks of DNA and RNA.

Answer: A, D
 Six-carbon sugars are found in many organic molecules including nucleotides. Nucleotides can also affect metabolic reaction rates. However, they are not principal components of cell membranes.

Question 8

Classification. The following are basic building blocks of biopolymers. Match the building blocks with the statements below.
 
-The monomers of a polypeptide chain
A)Amino acid
B)Glucose
C)Carboxyl head
D)Fatty acid tail
E)Nucleotide

Accepted Answer

Amino acids are the monomers of polypeptide chains. Glucose is a monomer of polysaccharides, carboxyl head is a component of fatty acids and nucleotides are monomers of nucleic acids.

Question 9

Classification. The following are chemical functional groups that may be part of a biologically active molecule. Answer the questions by matching the items with the most appropriate group. -The methyl group A)-COOH B)-CH₃ C)-NH₂ D)-OH E) F)-PO₄- G)-CHO

Accepted Answer

The methyl group is represented by -CH3.

Answer: A 
 The carboxyl group is represented by -COOH.

Answer: C 
 The amino group is represented by -NH2.

Answer: D 
 The hydroxyl group is represented by -OH.

Answer: F 
 The phosphate group is represented by -PO4-.

Answer: G 
 The aldehyde group is represented by -CHO.

Note: The image provided in the question is not visible to the AI language model, hence the corresponding answer has been excluded.

Question 10

Classification. The following are chemical functional groups that may be part of a biologically active molecule. Answer the questions by matching the items with the most appropriate group. -The carbonyl group of simple sugars A)-COOH B)-CH₃ C)-NH₂ D)-OH E) F)-PO₄- G)-CHO

Accepted Answer

The answer of Classification. The following are chemical functional groups...

Question 11

Classification. The following are chemical functional groups that may be part of a biologically active molecule. Answer the questions by matching the items with the most appropriate group. -The amine group A)-COOH B)-CH₃ C)-NH₂ D)-OH E) F)-PO₄- G)-CHO

Accepted Answer

The amine group is represented by NH2.

Answer: A 
 The carboxyl group is represented by COOH.

Answer: D 
 The hydroxyl group is represented by OH.

Answer: B 
 The methyl group is represented by CH3.

Answer: F 
 The phosphate group is represented by PO4-.

Answer: G 
 The aldehyde group is represented by CHO.

Question 12

Choose the most appropriate description for each item.
-Enzymes
A)A six-carbon sugar
B)Found in DNA and RNA
C)Principal components of cell membranes
D)Affect metabolic reaction rates

Accepted Answer

Enzymes are known to affect metabolic reaction rates.

Answer: A, B, C
 Enzymes are not a six-carbon sugar, found in DNA and RNA, and not principal components of cell membranes.

Question 13

Classification. The following are chemical functional groups that may be part of a biologically active molecule. Answer the questions by matching the items with the most appropriate group. -The group on the carboxyl-terminal end of proteins A)-COOH B)-CH₃ C)-NH₂ D)-OH E) F)-PO₄- G)-CHO

Accepted Answer

The carboxyl-terminal end of proteins contains a carboxyl group (-COOH), which is represented by choice A.

Question 14

Choose the most appropriate description for each item.
-Phospholipids
A)A six-carbon sugar
B)Found in DNA and RNA
C)Principal components of cell membranes
D)Affect metabolic reaction rates

Accepted Answer

Phospholipids are the principal components of cell membranes.

Answer: None of the above
 None of the descriptions match a six-carbon sugar or something found in DNA and RNA.

Question 15

Classification. The following are chemical functional groups that may be part of a biologically active molecule. Answer the questions by matching the items with the most appropriate group. -The group typical of energy carriers such as ATP A)-COOH B)-CH₃ C)-NH₂ D)-OH E) F)-PO₄- G)-CHO

Accepted Answer

The phosphate group (-PO4-) is typical of energy carriers such as ATP.

Question 16

Classification. The following are chemical functional groups that may be part of a biologically active molecule. Answer the questions by matching the items with the most appropriate group. -The group that is acidic A)-COOH B)-CH₃ C)-NH₂ D)-OH E) F)-PO₄- G)-CHO

Accepted Answer

The -COOH group is a carboxylic acid group, which is considered an acidic group due to its ability to donate a hydrogen ion (proton) in aqueous solution.

Question 17

Classification. The following are chemical functional groups that may be part of a biologically active molecule. Answer the questions by matching the items with the most appropriate group. -Fatty acid "head" A)-COOH B)-CH₃ C)-NH₂ D)-OH E) F)-PO₄- G)-CHO

Accepted Answer

Fatty acids have a carboxylic acid group (-COOH) at one end, which is the "head" of the molecule.

Answer: D
 Hydroxyl groups (-OH) are found in alcohol molecules and are important in the formation of many biological molecules.

Answer: E
 This is not a recognized chemical functional group.

Answer: F
 Phosphate groups (-PO4-) are commonly found in nucleotides and other molecules involved in energy storage and transfer.

Answer: G
 Aldehyde groups (-CHO) are found in many organic molecules, including some important biological molecules.

Question 18

Classification. The following are basic building blocks of biopolymers. Match the building blocks with the statements below.
 
-The basic unit of RNA
A)Amino acid
B)Glucose
C)Carboxyl head
D)Fatty acid tail
E)Nucleotide

Accepted Answer

Nucleotides are the basic units of RNA. Amino acids are the building blocks of proteins, glucose is a monosaccharide and the main source of energy in the body, carboxyl head and fatty acid tail are components of lipids.

Question 19

Classification. The following are chemical functional groups that may be part of a biologically active molecule. Answer the questions by matching the items with the most appropriate group. -Found in alcohols and sugars A)-COOH B)-CH₃ C)-NH₂ D)-OH E) F)-PO₄- G)-CHO

Accepted Answer

The -OH group is found in alcohols and sugars, such as glucose and fructose.

Answer: A
 The -COOH group is found in organic acids, such as acetic acid and citric acid.

Answer: C
 The -NH2 group is found in amino acids, the building blocks of proteins.

Answer: G
 The -CHO group is found in aldehydes, which are important intermediates in metabolism.

Answer: F
 The -PO4- group is found in phosphates, which are important in energy storage and transfer in biological systems.

Question 20

Classification. The following are chemical functional groups that may be part of a biologically active molecule. Answer the questions by matching the items with the most appropriate group. -The group on the amino-terminal end of proteins A)-COOH B)-CH₃ C)-NH₂ D)-OH E) F)-PO₄- G)-CHO

Accepted Answer

NH2 is the amino group and is commonly found at the amino-terminal end of proteins.

Quiz 3: Molecules of Life

Classification. The following are basic building blocks of biopolymers. Match the building blocks with the statements below. -The basic unit of proteins

Which molecule is incorrectly matched with its monomer?

Simple sugar converts from a straight-chain into a ring form when the __________ group combines with a hydroxyl group.

Classification. The following are basic building blocks of biopolymers. Match the building blocks with the statements below. -The basic unit of DNA

Classification. The following are chemical functional groups that may be part of a biologically active molecule. Answer the questions by matching the items with the most appropriate group. -The group that makes lipid head's hydrophilic

Classification. The following are chemical functional groups that may be part of a biologically active molecule. Answer the questions by matching the items with the most appropriate group. -The aldehyde group in simple sugars

Choose the most appropriate description for each item. -Nucleotides

Classification. The following are basic building blocks of biopolymers. Match the building blocks with the statements below. -The monomers of a polypeptide chain

Classification. The following are chemical functional groups that may be part of a biologically active molecule. Answer the questions by matching the items with the most appropriate group. -The methyl group

Classification. The following are chemical functional groups that may be part of a biologically active molecule. Answer the questions by matching the items with the most appropriate group. -The carbonyl group of simple sugars

Classification. The following are chemical functional groups that may be part of a biologically active molecule. Answer the questions by matching the items with the most appropriate group. -The amine group

Choose the most appropriate description for each item. -Enzymes

Classification. The following are chemical functional groups that may be part of a biologically active molecule. Answer the questions by matching the items with the most appropriate group. -The group on the carboxyl-terminal end of proteins

Choose the most appropriate description for each item. -Phospholipids

Classification. The following are chemical functional groups that may be part of a biologically active molecule. Answer the questions by matching the items with the most appropriate group. -The group typical of energy carriers such as ATP

Classification. The following are chemical functional groups that may be part of a biologically active molecule. Answer the questions by matching the items with the most appropriate group. -The group that is acidic

Classification. The following are chemical functional groups that may be part of a biologically active molecule. Answer the questions by matching the items with the most appropriate group. -Fatty acid "head"

Classification. The following are basic building blocks of biopolymers. Match the building blocks with the statements below. -The basic unit of RNA

Classification. The following are chemical functional groups that may be part of a biologically active molecule. Answer the questions by matching the items with the most appropriate group. -Found in alcohols and sugars

Classification. The following are chemical functional groups that may be part of a biologically active molecule. Answer the questions by matching the items with the most appropriate group. -The group on the amino-terminal end of proteins