Chapter 5 Macromolecules Part 2

2.

Dehydration reactions are used in the forming of

Triglycerides
Polysaccharides
Proteins
Triglycerides and proteins only
All three are correct

Correct Answer

A. All three are correct

Explanation

Dehydration reactions are used in the forming of triglycerides, polysaccharides, and proteins. These reactions involve the removal of water molecules to create chemical bonds between monomers, resulting in the formation of larger molecules. Triglycerides are formed through the dehydration synthesis of three fatty acid molecules and one glycerol molecule. Polysaccharides, such as starch and cellulose, are formed through the dehydration synthesis of multiple sugar molecules. Proteins are formed through the dehydration synthesis of amino acid molecules. Therefore, all three options are correct as dehydration reactions play a role in the formation of triglycerides, polysaccharides, and proteins.

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3.

Nucleotides are to _, as _ are to proteins.

Nucleic acids/amino acids
Amino acids/polypeptides
Genes/enzymes
Polymers/polypeptides
Glycosidic linkages/polypeptide linkages

Correct Answer

A. Nucleic acids/amino acids

Explanation

Nucleotides are the building blocks of nucleic acids, which include DNA and RNA. Similarly, amino acids are the building blocks of proteins. Both nucleic acids and proteins are essential biomolecules involved in various biological processes.

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4.

If one strand of a DNA molecule has the sequence ATTGCA, the complementary strand is

TAACGT
UAACGU
TUUCGU
TAAGCT
TUUGCT

Correct Answer

A. TAACGT

Explanation

The complementary strand of DNA is formed by pairing nucleotides with their complementary bases. In DNA, adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G). Therefore, to find the complementary strand, we need to replace each base with its complementary base. In the given sequence ATTGCA, A pairs with T, T pairs with A, G pairs with C, and C pairs with G. So, the complementary strand is TAACGT.

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5.

All of the following molecules are proteins except

Hemoglobin
Antibodies
Collagen
Lysozomes
Cellulose

Correct Answer

A. Cellulose

Explanation

Cellulose is not a protein because it is a complex carbohydrate made up of glucose molecules linked together. Hemoglobin, antibodies, collagen, and lysozomes are all proteins. Hemoglobin is a protein found in red blood cells that transports oxygen. Antibodies are proteins produced by the immune system to help fight off infections. Collagen is a protein that provides structure and support to tissues such as skin, tendons, and bones. Lysozomes are organelles within cells that contain enzymes for breaking down waste materials.

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6.

Polysaccharides, lipids and proteins are similar in that they

Are synthesized from monomers by the process of hydrolysis
Are synthesized from monomers by the process of dehydration reactions
Are synthesized by peptide bonding between monomers
Are decomposed into their subunits by the process of dehydration reactions
All contain nitrogen in their monomers

Correct Answer

A. Are synthesized from monomers by the process of dehydration reactions

Explanation

Polysaccharides, lipids, and proteins are all macromolecules that are synthesized from smaller subunits called monomers. The process by which these macromolecules are formed is called dehydration reactions, where a water molecule is removed to link the monomers together. This process of dehydration reactions is common for the synthesis of all three types of macromolecules. Therefore, the correct answer is that polysaccharides, lipids, and proteins are synthesized from monomers by the process of dehydration reactions.

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7.

The two strands making up DNA

Can't be separated
Contain ribose and deoxyribose in opposite strands
Are held together by hydrogen bonds and Van der Waals forces
Are attached through a phosphate that holds the strands together
Contain "U" but not "T"

Correct Answer

A. Are held together by hydrogen bonds and Van der Waals forces

Explanation

The correct answer is that the two strands making up DNA are held together by hydrogen bonds and Van der Waals forces. These forces are responsible for the stability and structure of the DNA molecule. Hydrogen bonds form between complementary base pairs (adenine with thymine, and guanine with cytosine), while Van der Waals forces help to stabilize the overall structure of the double helix. These forces are relatively weak individually, but when combined, they provide the necessary strength to hold the two strands of DNA together.

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8.

The structural feature that allows DNA to replicate itself is

Sugar phosphate backbone
Complementary base pairing
Phosphodiester bonding between each side of the helix
Twisting of the molecule to form an alpha helix
Three part structure of nucleotides

Correct Answer

A. Complementary base pairing

Explanation

Complementary base pairing is the structural feature that allows DNA to replicate itself. This refers to the specific pairing of nucleotide bases, where adenine (A) always pairs with thymine (T), and cytosine (C) always pairs with guanine (G). This base pairing allows for the accurate replication of DNA during cell division, as each strand serves as a template for the synthesis of a new complementary strand. This ensures that the genetic information is faithfully passed on to the next generation.

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9.

To turn a "nucleoside" into a "nucleotide" it would be necessary to

Combine two nucleosides in dehydration synthesis
Remove the pentose from the nucleoside
Replace purine with pyrimidine
Add phosphate to the nucleoside
Replace ribose with deoxyribose

Correct Answer

A. Add phosphate to the nucleoside

Explanation

To turn a "nucleoside" into a "nucleotide", it would be necessary to add a phosphate group to the nucleoside. This is because a nucleotide is composed of a nucleoside (which consists of a nitrogenous base and a sugar) and one or more phosphate groups. The addition of the phosphate group forms the phosphodiester bond, which links the nucleoside to the phosphate group and converts it into a nucleotide.

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10.

Which of the following illustrates hydrolysis?

Two monosaccharides form a disaccharide and release water
Two amino acids form a dipeptide using water
Fat forming glycerol and fatty acids releasing water
Fat forming glycerol and fatty acids using water
Making a nucleotide using water

Correct Answer

A. Fat forming glycerol and fatty acids using water

Explanation

The correct answer is "fat forming glycerol and fatty acids using water". Hydrolysis is a chemical reaction in which a compound is broken down into its components by the addition of water. In this case, the fat molecule is broken down into its components, glycerol and fatty acids, with the help of water.

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Chapter 5 Macromolecules Part 2

All of the following are carbohydrates except

Quiz Preview

Dehydration reactions are used in the forming of

Nucleotides are to _, as _ are to proteins.

If one strand of a DNA molecule has the sequence ATTGCA, the complementary strand is

All of the following molecules are proteins except

Polysaccharides, lipids and proteins are similar in that they

The two strands making up DNA

The structural feature that allows DNA to replicate itself is

To turn a "nucleoside" into a "nucleotide" it would be necessary to

Which of the following illustrates hydrolysis?

Chapter 5 Macromolecules Part 2

All of the following are carbohydrates except

Quiz Preview

Dehydration reactions are used in the forming of

Nucleotides are to _________________, as _________________ are to proteins.

If one strand of a DNA molecule has the sequence ATTGCA, the complementary strand is

All of the following molecules are proteins except

Polysaccharides, lipids and proteins are similar in that they

The two strands making up DNA

The structural feature that allows DNA to replicate itself is

To turn a "nucleoside" into a "nucleotide" it would be necessary to

Which of the following illustrates hydrolysis?

Nucleotides are to _, as _ are to proteins.