Question 1

Explain what diets that are high in saturated fats can cause in the circulatory system of a human.

Accepted Answer

The answer of Explain what diets that are high in...

Question 2

Denaturation of proteins is always a reversible process.

Accepted Answer

Denaturation of proteins can be reversible or irreversible, depending on the conditions such as temperature, pH, and the presence of denaturing agents.

Question 3

Nucleic acids are long polymers of repeating subunits called __________.

Accepted Answer

The answer of Nucleic acids are long polymers of repeating...

Question 4

A __________ bond links two amino acids together.

Accepted Answer

The answer of A __________ bond links two amino acids...

Question 5

Many mammals supply energy to their young in the form of __________.

Accepted Answer

The answer of Many mammals supply energy to their young...

Question 6

The sequence of nucleotides in DNA specifies the sequence of ________________ in a protein.

Accepted Answer

The answer of The sequence of nucleotides in DNA specifies...

Question 7

Choose the statement that is true about DNA:
A)It exhibits base pairing.
B)It forms a double helix.
C)It is a polymer of nucleotides.
D)All of these are correct.

Accepted Answer

All of the statements provided (base pairing, double helix structure, and polymer of nucleotides) are true about DNA.

Question 8

Fatty acids that contain the maximum number of hydrogen atoms possible are said to be:
A)polyunsaturated
B)monounsaturated
C)saturated
D)phospholipids

Accepted Answer

Fatty acids that contain the maximum number of hydrogen atoms possible are called saturated fatty acids. This means that all the carbon atoms in the fatty acid chain are bonded to as many hydrogen atoms as possible, leaving no double bonds between carbon atoms.

Question 9

Unsaturated fats are usually solid at room temperature.

Accepted Answer

Unsaturated fats are usually liquid at room temperature, while saturated fats are usually solid.

Question 10

Which is incorrect about proteins?
A)The main function of protein is energy storage.
B)Proteins can be enzymes.
C)Proteins are polymers of amino acids.
D)The sequence of amino acids determines the identity of the protein.
E)Some proteins have a transport function.

Accepted Answer

The main function of protein is not energy storage, but rather a wide range of functions such as structural support, enzymatic activity, and signaling. Carbohydrates and fats are the primary sources of energy storage.

Question 11

Animals store energy in a polymer composed of many glucose molecules called:
A)starch
B)glycogen
C)cellulose
D)chitin

Accepted Answer

Animals store energy in the form of glycogen, which is made up of many glucose molecules linked together in a branched chain. Starch is the storage form of glucose in plants, cellulose is a structural carbohydrate found in plant cell walls, and chitin is a structural carbohydrate found in the exoskeletons of arthropods and some fungi.

Question 12

List the four major types of macromolecules,their subunits (building blocks),and their functions.

Accepted Answer

The answer of List the four major types of macromolecules,their...

Question 13

Lipids are insoluble in water because they are nonpolar.

Accepted Answer

Lipids are made up of hydrophobic (water-fearing) compounds such as fatty acids, which have a long hydrocarbon chain that gives them a nonpolar nature. Water is a polar solvent and therefore cannot dissolve nonpolar substances like lipids. This causes lipids to separate from water and form distinct droplets or layers.

Question 14

All of the following are ways RNA differs from DNA except:
A)RNA is single-stranded
B)RNA is a nucleic acid
C)RNA contains ribose
D)RNA contains uracil

Accepted Answer

RNA and DNA are both nucleic acids, so B is incorrect. A, C, and D are all ways that RNA differs from DNA.

Question 15

Making and breaking molecules in the body require the aid of ____________ to help the reactions proceed.
A)heat
B)water
C)blood
D)enzymes

Accepted Answer

Enzymes are protein molecules that act as catalysts to speed up chemical reactions in the body. They are involved in the breakdown of complex molecules into simple ones (e.g. digestion) as well as building up complex molecules from simpler ones (e.g. protein synthesis). Enzymes are essential in the body, as they allow reactions to occur at a temperature compatible with life and at a rate that is compatible with the demands of the body.

Question 16

In RNA,thymine is replaced with __________.

Accepted Answer

The answer of In RNA,thymine is replaced with __________....

Question 17

The polysaccharide found in the cell walls of plants is __________.

Accepted Answer

The answer of The polysaccharide found in the cell walls...

Question 18

The final three-dimensional shape of a single polypeptide is called its _____________ structure.
A)primary
B)secondary
C)tertiary
D)quaternary

Accepted Answer

The tertiary structure is the final three-dimensional conformation of a single polypeptide chain that results from interactions between amino acid side chains and the environment. This structure determines the protein's overall function. The primary structure refers to the linear sequence of amino acids, while the secondary structure refers to local folding patterns such as alpha helices and beta sheets. The quaternary structure refers to how multiple polypeptide chains come together to form a larger protein complex.

Question 19

The building blocks of carbohydrates are:
A)amino acids
B)polypeptides
C)monosaccharides
D)nucleotides

Accepted Answer

Carbohydrates are made up of monosaccharides, which are simple sugars such as glucose, fructose, and galactose. Amino acids are the building blocks of proteins, polypeptides are longer chains of amino acids, and nucleotides are the building blocks of nucleic acids.

Question 20

Proteins are made up of ____________ strung together by _________ bonds.
A)amino acids;peptide
B)monosaccharides;covalent
C)monomers;ionic
D)polymers;hydrogen

Accepted Answer

Proteins are composed of amino acids that are linked together by peptide bonds to form a long chain or polypeptide. Therefore, option A is the correct answer. Option B is incorrect because monosaccharides are simple sugars that form polysaccharides, not proteins. Option C is also incorrect because ionic bonds are not strong enough to hold together the amino acids in proteins. Option D is incorrect because polymers are long chains of repeating units, but amino acids are not repeating units.

Quiz 3: Molecules of Life

Explain what diets that are high in saturated fats can cause in the circulatory system of a human.

Denaturation of proteins is always a reversible process.

Nucleic acids are long polymers of repeating subunits called __________.

A __________ bond links two amino acids together.

Many mammals supply energy to their young in the form of __________.

The sequence of nucleotides in DNA specifies the sequence of ________________ in a protein.

Choose the statement that is true about DNA:

Fatty acids that contain the maximum number of hydrogen atoms possible are said to be:

Unsaturated fats are usually solid at room temperature.

Which is incorrect about proteins?

Animals store energy in a polymer composed of many glucose molecules called:

List the four major types of macromolecules,their subunits (building blocks),and their functions.

Lipids are insoluble in water because they are nonpolar.

All of the following are ways RNA differs from DNA except:

Making and breaking molecules in the body require the aid of ____________ to help the reactions proceed.

In RNA,thymine is replaced with __________.

The polysaccharide found in the cell walls of plants is __________.

The final three-dimensional shape of a single polypeptide is called its _____________ structure.

The building blocks of carbohydrates are:

Proteins are made up of ____ strung together by _ bonds.