How do enzymes speed up chemical reactions?

They raise the activation energies of reactions.
They lower the activation energies of reactions.
They react with products to form new compounds.
They react with substrates to form new compounds.

How do manufacturers make trans fats?

They add hydrogen to unsaturated fats.
They remove hydrogen from saturated fats.
They add hydrogen to saturated fats.
They remove hydrogen from polyunsaturated fats.

How do manufacturers make trans fats?

They add hydrogen to unsaturated fats.
They remove hydrogen from saturated fats.
They add hydrogen to saturated fats.
They remove hydrogen from polyunsaturated fats.

What happens to monomers when they undergo dehydration synthesis?

They combine with water molecules.
They become dry and powder-like.
They break up into smaller molecules.
They form long chain-like molecules.

What makes one DNA molecule different from another?

the number of phosphates it has
the type of sugar it has in each strand
the number of strands that make it up
the sequence of bases along the strands

Which class of organic compounds stores energy as fat?

lipids
nucleic acids
carbohydrates
proteins

Which class of macromolecules is not organized in repeating units of monomers?

nucleic acids
carbohydrates
lipids
proteins

Starch and _____ are common polysaccharide carbohydrates found in plants.

cellulose
glycogen
fructose
sucrose

Which macromolecule gives the body the energy it needs to carry out cell functions?

carbohydrates
dietary fibers
membranes
nucleic acids

What is one role that lipids play in the body?

They make up the contracting structures of muscles.
They make up structural parts of cell membranes.
They store coded information about heredity.
They provide a quick source of energy for cells

The activation energy of a reaction is the specific amount of energy which is needed to start the reaction.
Enzymes catalyze the reaction by lowering the activation energy of the reaction.
If the reaction does not use an enzyme, then a huge amount of energy will be needed to start the reaction and the reaction rate will be low.
But with an enzyme, less amount of energy is needed to start the reaction, which speeds up the reaction.

The correct answer is option B which is they remove hydrogen from saturated fats.

Explanation:

Saturated fats means fats with single bonds.
While trans fats means unsaturated fats which have double bonds.
So for the manufacturing of trans fats, hydrogen from saturated fats are removed.
Which cause to form carbon carbon double bonds to form a stable structure.

The correct option is D which is they form long chain like molecules.

Explanation:

Dehydration is the process of removing or release of water.
Polymerization is a reaction when two or more monomers joined together with the removal of water forming polymers.
Polymers are long chain compounds.
So from above given statements when when monomers react to each other and undergo dehydration.
That means they undergo polymerization.

The correct option is option D which is DNA molecules are different from each other due the sequence of nucleotide bases.

Explanation:

A DNA molecule contains:

There are total 4 type of base in a DNA molecule.

So there are total four monomers of DNA molecule.

But every one has a different DNA.

This is because these different four nucleotides are joined in a strand with different sequence.

The correct option is A which is lipids.

Explanation:

Fats is the name of stored energy in form of lipids.
Generally body store energy in form of glycogen.
But when there is extra energy in body , it is saved in form of lipids in adipose tissues.
Lipids are polymers of fatty acids and glycerol.
So lipids are commonly known as fats.

The correct option is A which is nucleic acids.

Explanation:

Macro-molecules are usually polymers which are formed from the polymerization of repeating units in a distinct pattern.
Lipids, proteins and sugars all follow the above rule.
But in case of nucleic acid which is made up of four different nucleotides but the pattern or sequence of these nucleotide is not specific for all.
Every person has a distinct sequence of nucleotides in its nucleic acid.

The correct option is option A which is cellulose.

Explanation:

In plants common polysaccharides are starch and cellulose.
Glycogen is a polysaccharide preset only in animals.
While fructose is a monosaccharide.
Sucrose is a disaccharide.
So from question statement a polysaccharide of plant is cellulose. It is not present in animals.

The correct option is the option A (carbohydrates).

Explanation:

Body needs energy to carry out different functions.
The energy in the body is produced from the respiration in cell.
Respiration is the process of energy production in form of ATP by the breakdown of carbohydrate.
So any other macromolecule is first converted to glucose (carbohydrate) and then the break down of that carbohydrate gives energy.

The correct option is B which is lipids make up the structural parts of cell membranes.

Explanation:

Cell membrane is a lipid bilayer.
Lipids are used in the formation of membranes because of its hydrophobic property.
Lipids are non polar molecules and they don't dissolves in water molecules. Instead they repel water molecules, It is known as hydrophobic property of lipids.
Due to this hydrophobic property they make the distinct wall in watery cytoplasm.