B1.1 Carbohydrates & Lipids Flashcards by Unknown Unknown | Brainscape

Q

Outline the number and type of bonds carbon can form with other atoms

A

carbon can form 4 single covalent bonds with other atoms

The covalent bond is considered to be a stable bond and therefore, its presence gives stability to molecules
the fact that carbon can bind to four different atoms allows for formation of an array of diverse molecules in which carbon plays an important part

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Q

Outline the cause and consequence of covalent bonds between atoms

A

Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell
It often happens that covalent bond formation does not lead to an equal sharing of a pair of electrons between two atoms

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Q

what are the common functional groups?

A

common functional groups:
- hydroxyl
- carbonyl
- carboxyl
- amine
- phosphate

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Q

what common functional group is this?

A

hydroxyl

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Q

what common functional group is this?

A

carbonyl

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Q

what common functional group is this?

A

carboxyl

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Q

what common functional group is this?

A

amine

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Q

what common functional group is this?

A

phosphate

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Q

List the four major classes of carbon compounds used by living organisms

A

carbohydrates
lipids
proteins
nucleic acids

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Q

List example molecules with branched chains

A

Amylopectin
Glycogen

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Q

Examples of molecules with unbranched chains

A

Amylose
Cellulose

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Q

Examples of molecules with a single ring

A

Alpha glucose
Beta glucose
Ribose
Deoxyribose

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Q

Examples of molecules with multiple rings

A

Maltose
Sucrose
Lactose

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Q

Define monomer and polymer

A

Monomer = a simple unit that makes up larger molecules + which can be bonded with similar molecules to form a polymer
Polymer = a substance with a chemical structure formed of many repeating units of monomers

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Q

describe condensation reactions

A

a condensation reaction removes a water molecule to join two monomers

it is used to make polymers
in polymerization, each monomer is joined using a condensation reaction and forms a glycosidic bond
basically, in condensation reactions, monomers join together by taking out an OH and an H, resulting in a loss of a water molecule (H2O)

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Q

what is needed to produce macromolecules by condensation reactions?

A

you need energy from ATP in order to produce macromolecules by condensation reactions

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Q

Outline the condensation reactions that form
- polysaccharides
- polypeptides
- nucleic acids

A

Monosaccharide units are joined by a carbon-oxygen linkage known as a glycosidic bond to form a chain called a polysaccharide
When amino acids bond, water is lost and the nitrogen and carbon bond to form a peptide bond, and creates a polypeptide

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Q

what are monosaccharides?

A

Monosaccharides are the monomers that make up carbohydrates
it is a single sugar molecule
it has a backbone of 3-7 carbon atoms
it has a ring structure
it is hydrophilic and soluble in water
examples: glucose, galactose, fructose

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Q

Describe hydrolysis reactions

A

it is a chemical reaction in which a polymer breaks apart into monomers
the addition of water is used to break the bonds
the reaction releases energy

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Q

a single macromolecule is called __?
a long chain of monomers is __?

A

a single macromolecule is referred to as a monomer
a long chain of monomers is a polymer

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Q

Outline the hydrolysis reactions that digest
- polysaccharides
- polypeptides
- nucleic acids

A

A polysaccharide releases energy when digested via a hydrolysis reaction, broken down into monosaccharides
The hydrolysis reaction of polypeptides breaks them down into monomers that are amino acids

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Q

identify pentose and hexose carbohydrates from molecular diagrams

A

know how to do this!

pentose = five member ring
hexose = six member ring

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Q

which one is pentose and which one is hexose?

A

left = hexose
right = pentose

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Q

Outline the properties of glucose referring to
- solubility
- transportability
- stability
- energy yield from oxidation

A

They are:
- Soluble in water
- Easily transported through cell membranes
- Needed to make ATP during cellular respiration

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Q

define polysaccharide

A

they are polymers of monosaccharides linked by glycosidic bonds to form a chain

(it is the proper term for a starch)

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Q

Compare the structure and function of amylose, amylopectin, and glycogen

A

AMYLOSE:

Amylose is an unbranched structure (it has a spiral structure instead)
has 1,4 glycosidic bonds
A polymer of alpha-glucose
Amylose is harder to digest and less soluble, BUT, as it takes up less space, is the preferred storage form in plants

AMPLYOPECTIN:

Amylopectin is a branched structure
1,4 and some 1,6 glycosidic bonds
A polymer of alpha-glucose
function = to store energy in plants and make up the structure of the plant starch granule as a storage unit

GLYCOGEN:

A polymer of alpha-glucose
it is branched more frequently, has a branched structure
it is an energy store of glucose
it does not affect the water potential of the cells

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Q

what is the benefit of polysaccharide coiling and branching during polymerization?

A

Becoming tightly compacted through coiling helps keep energy stored for a later time.
In cellulose, it also provides strength in its structure

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Q

Explain how condensation or hydrolysis of alpha-glucose monomers build or mobilize energy stores

A

Amylose, Amylopectin, Glycogen, and Cellulose (polymers of alpha-glucose) are formed by condensation reactions
Polysaccharides release energy via a hydrolysis reaction

SO, the condensation or hydrolysis of alpha-glucose monomers can build/mobilize energy stores

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Q

compare the structure of alpha-glucose and beta-glucose

A

Alpha glucose has the H above and the OH below the carbon 1, the bond is pointing down
Beta glucose has the OH above and the H below the carbon 1, the bond is pointing up

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Q

Describe the structure of cellulose microfibrils

A

Cellulose microfibrils consist of bundles of around 36 cellulose chains that are embedded in a matrix of hemicelluloses and lignin
Forms chains which run parallel with hydrogen bonds between the chains to form microfibrils
Microfibrils are strong

The hydrogen bonds formed between the individual chains in cellulose are relatively weak in comparison to the glycosidic bonds which have formed between the individual glucose monomers

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Q

what is cellulose?

A

Main structural sugar in plants
Fibrous, and therefore an important structural component of plant cell walls
Very strong
Permeable to numerous substances
About 33% of plant matter
Most common organic compound on Earth

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Q

what are the consequences of the strength of cellulose in the plant cell wall?

A

the strength of cellulose in the plant cell wall help maintain the rigidity strength and shape of cell walls

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Q

what is the function of glycoproteins in the cell membrane?

A

Glycoproteins play a role in cell-cell recognition as they act as markers on the surface of cells. (ex. immune cells recognise and attack foreign cells that display different glycoproteins)
Glycoproteins can act as receptors on the surface of cells
Other glycoproteins can act as ligands
Glycoproteins also contribute to the structural integrity of cells and tissues

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Q

what are glycoproteins?

A

Glycoproteins = proteins that have one or more carbohydrates attached to them. These carbohydrates can be attached to specific amino acid residues within the protein.

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Q

compare the structure of the A, B, and O glycoproteins on the red blood cell membrane

A

A, B, and O glycoproteins all have the same structure

HOWEVER:

The “A” glycoprotein has an extra glycosidic bond to a N acetyl-galactosamine
(type A glycoproteins)
while “B” glycoprotein has an extra glycosidic bond to another galactose
(type B glycoproteins))
The “O” glycoprotein, on the other hand, has one less monosaccharide than A and B
(Blood type O individuals have neither type A or type B glycoproteins. Type 0 individuals have a glycoprotein with one less sugar in the oligosaccharide)
Red blood cells have glycoproteins on their their plasma membranes that distinguish ABO blood type

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Q

what are the consequences of the presence of A, B, and O glycoproteins during blood transfusion?

A

If blood containing glycoprotein A is transfused into a person who does not produce it themself, the blood will be rejected
Similarly, blood containing glycoprotein B is rejected if a person does not produce it themself
However, glycoprotein O does not cause rejection problems, because it has the same structure as A and B with one monosaccharide less, so it will not be recognized as foreign

BAISICALLY:

The compatibility of blood types is based on recognition and interaction of specific glycoproteins on the surface of red blood cells

When incompatible blood types are mixed, the immune system can recognise the other glycoproteins as foreign molecules and attack

Q

The ABO blood group system is based on ____?

A

it is based on the presence of specific glycoproteins on the surface of red blood cells

Q

why are lipids hydrophobic?

A

Lipids are hydrophobic because they do not contain a lot of -OH bonds. Instead, they contain a lot of -CH bonds
This causes them to be nonpolar, and not very readily available to form hydrogen bonds with water

Q

Outline the structure and function of

fats and oils

A

there are 3 fatty acids + glycerol
they are used for long-term energy storage

Q

Outline the structure and function of

waxes

A

they are composed of long hydrocarbon chains
waxes have a protective and coating function in live organisms as they are insoluble in water and form a waterproof protective coating

Q

Outline the structure and function of

steroids

A

they have a backbone of four carbon rings
steroids reduce the fluidity of the cell membrane

Q

Explain the condensation reaction connecting fatty acids and glycerol to form a triglyceride

A

The hydroxyl groups of glycerol combine with the carboxyl groups of the fatty acids to form an ester linkage

Q

Explain the condensation reaction connecting fatty acids, glycerol and a phosphate group to form a phospholipid

A

The hydroxyl groups of glycerol combine with the carboxyl groups of the fatty acids to form an ester linkage
The third oxygen on glycerol is bonded to a phosphoric acid through a phosphate ester bond

Q

how are phospholipids formed?

A

by connecting fatty acids, glycerol and a phosphate group via a condensation reaction

Q

how are triglycerides formed?

A

by connecting fatty acids and glycerol via a condensation reaction

Q

Describe + draw the structure of a generalized fatty acid

A

it is a long chain of mostly carbon and hydrogen atoms with a COOH carboxyl group at the end

Q

Compare and contrast the structures and properties of saturated and unsaturated fatty acids

A

Saturated fatty acids have single bonds satisfied and are solid at room temperature
Unsaturated fatty acids have double bonds and not all bonds satisfied, typically liquid at room temperature

Q

Distinguish between the structure and properties of cis- and trans-unsaturated fatty acids

A

Cis has hydrogen atoms on the same side of the C double bond and causes a kink in the chain, naturally occurring.
Trans has hydrogen atoms on opposite sides of the C double bond, causing a straighter chain, not found in nature

Q

Unsaturated fatty acids can be further subclassified into ___ or ____?

A

Unsaturated fatty acids can be further subclassified into either Cis or Trans fatty acids,

Q

unsaturated fatty acids can be ___-unsaturated or ___-unsaturated

A

Q

what are triglycerides suitable for?

A

they are suitable for long-term energy storage

Q

what properties of triglycerides make them suitable for long-term energy storage?

A

Triglycerides are excellent long-term energy storage molecules because they will not mix with water and break down

Q

what is the function of adipose tissue?

A

The main function of adipose tissue is to store energy in the form of lipids

Q

what is the adaptation of a thick adipose tissue layer?

A

the adaption of a thick adipose tissue layer works as a thermal insulator
the layer does not transfer heat as well as other tissues and materials (such as muscle or skin), so it is good at insulating and trapping heat

Q

draw a simplified diagram of the structure of the phospholipid (including a phosphate-glycerol head and two fatty acid tails)

A

Q

Define

hydrophilic
hydrophobic
amphipathic

A

Hydrophilic = “water loving,”
Hydrophobic = “water fearing,”
Amphipathic = having both hydrophilic and hydrophobic properties

Q

Outline the amphipathic properties of a phospholipid

A

A phospholipid has a hydrophilic head and a hydrophobic tail

Q

Explain why phospholipids form bilayers in water

(with reference to hydrophilic phosphate heads and two hydrophobic hydrocarbon tails)

A

They form bilayers because of their amphiphilic characteristics

The hydrophilic phosphate heads can bond with water and position themselves on the outside
the hydrophobic hydrocarbon tails do not bond with water so they face away from the water

Q

When exposed to water, phospholipids form one of two structures:

____ or _____

A

a micelle or a bilayer

In each structure, the hydrophilic heads face the water, and the hydrophobic tails point inwards away from the water

Q

why are phospholipid bilayers ideally suited in membranes?

A

Phospholipid bilayers are therefore ideally suited in membranes as it allows the outer surfaces of the hydrophilic heads to interact with water

Q

understand how to label these diagrams

A

Q

what is this showing?

A

it is a molecular diagram showing steroid molecules

Q

why are steroid hormones able to pass directly through the phospholipid bilayer?

A

Because they are hydrophobic molecules,

they are capable of passing through the phospholipid bilayer of cells to reach their target receptor site usually inside the nucleus

they can also pass through the nuclear envelope (this allows these cells to have a faster response to the presence of these steroids allowing the signal to occur more efficiently)

Q

____ is able to pass directly through the phospholipid bilayer

A

steroid hormones are able to pass directly through the phospholipid bilayer

Q

what are steroids?

A

Steroids = a group of naturally occurring hormones that play a vital role in regulating a wide range of physiological functions in the body
steroids = hydrophobic molecules

Q

describe the composition of steroids

A

they are composed of four carbon-based rings as the basic structure

BUT the difference in functional groups is vast, allowing steroids to have a diverse array of functions

Q

Give two examples of monomers

A

Nucleic acids, monosaccharides, amino acids, fatty acids…

Q

Explain what happens in a condensation reaction between two monomers

A

Two monomers are joined together with the release of water.

Q

What type of reaction involves the breakage of a chemical bond between two monomers using water?

A

Hydrolysis

Q

what is maltose?

A

Maltose = a disaccharide formed from two alpha-glucose molecules, joined by a glycosidic bond

Q

Draw a flow diagram to show the breakage of maltose into two a-glucose monomers. (picture of maltose included)

A

(add water)

Q

what is sucrose?

A

Sucrose = a disaccharide formed from an alpha-glucose and a fructose molecule, joined by a glycosidic bond

Q

A

Q

How do we test for starch?

A

use iodine. it turns yellow/brown to purple/black

Q

Why is it important that there are free sugars at the end of glycogen chains?

A

They are easily hydrolysed to provide energy and glucose can easily be added for storage

Q

What force holds chains of cellulose together?

A

Hydrogen bonds

Q

Why is fibre (cellulose) important for our diet?

A

improves digestion, reduces constipation, makes us feel fuller, reduced risk of type 2 diabetes, etc

Q

Describe how a triglyceride is broken down into its component parts

A

Triglycerides are broken down by the process of hydrolysis. Water is added to break the 3 ester bonds. This produces one molecule of glycerol and 3 fatty acids.

Q

A

Q

Carbon atoms can form up to __?

A

four single bonds or a combination of single and double bonds with other carbon atoms or atoms of other non-metallic elements

Q

Macromolecules are produced by?

A

condensation reactions that link monomers to form a polymer

Polymers can be digested into monomers by hydrolysis reactions that split water molecules to provide the -H and -OH groups necessary to produce monomers

Q

Glucose is?

A

a stable polar monosaccharide (hexose) that is soluble in blood plasma and can be oxidised in cellular respiration

Q

Polysaccharides are?

A

energy storage compounds that are compact and insoluble due to their large molecular size and coiling and branching during polymerisation

(examples = starch and glycogen)

Q

Cellulose is?

A

a structural polysaccharide in plants with straight chains that can be grouped in bundles and cross-linked with hydrogen bonds

Q

Glycoproteins play a role in?

A

cell-cell recognition, such as ABO antigens

Q

Lipids are?

A

are substances in living organisms that dissolve in non-polar solvents and include fats, oils, waxes and steroids

Q

Triglycerides in adipose tissues are?

A

used for long-term energy storage and thermal insulation

Q

Phospholipid bilayers are formed as a consequence of?

A

the hydrophobic and hydrophilic regions of phospholipids, which allow hydrophobic steroids to pass through them, such as oestradiol and testosterone