Lect. 3 Carbohydrates Flashcards

1
Q

Glucose

A

Used in polymer synthesis

(monosaccharide)

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2
Q

Fructose

A

Component of table sugar

(monosaccharide)

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3
Q

Galactose

A

Component of milk sugar

(monosaccharide)

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4
Q

Ribose (Type)

A

Used in RNA nucleotides

Component of RNA

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5
Q

Deoxyribose (Type)

A

Used in DNA nucleotides

Component of DNA

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6
Q

Sucrose

A

In plants, table sugar

di-saccharide

glu + fru

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7
Q

Lactose

A

Milk sugar

di-saccharide

glu + gal

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8
Q

Maltose

A

Brewing sugar

di-saccharide

glu + glu

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9
Q

Starch

A

Storage in plants

polysaccharide

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10
Q

Glycogen

A

Storage in animals

polysaccharide

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11
Q

Cellulose

A

Structural in plants

polysaccharide

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12
Q

Chitin

A

Structural in animals in fungi

polysaccharide

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13
Q

Peptidoglycan

A

Structural in bateria

polysaccharide

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14
Q

2 types of sugar

A

aldoses and ketoses

difference lies in the location of the carbonyl gr. (-C=O)

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15
Q

Monosaccharide molecular formulas

A

multiple of CH2O

(1:2:1 ratio)

[CH2O]n where n is a nber between 3 and 7

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16
Q

3 most common sugars

A
  • Trioses (smallest sugars)
  • Pentoses (in DNA)
  • Hexoses (common sugars)
17
Q

3 common monosaccharides

(all hexoses)

A
  • glucose
  • galactose
  • fructose

all 3 have chemical formula: C6H12O6

they are structural isomers of one another

18
Q

most common monosaccharide

A

glucose

its open chain forms of glucose form ring structures in solutions

ring form is the most common form in living organisms

19
Q

How does glucose form rings?

What is the ring called?

A

C1 aldehyde reacts with C5 hydroxyl gr. to form a ring called a pyranose ring

20
Q

2 isomers of glucose ring structure

A
  • α-glucose, OH gr. at C1 is on the opp. side of CH2OH
  • β-glucose, OH gr. at C1 is on the same side as CH2OH

these isomeric forms differ in the orientation of the OH gr. at C1

21
Q

Glucose in Biology

Glucose is the end product of what process? What is it used for?

A
  • Photosynthesis in plants
  • Glucose is used as an energy source in most organisms

During cellular respiration, cells oxidize glucose molecules converting the stored energy to a form that can be readily used for cell work.

22
Q

Homeostasis of Blood Glucose

What regulates the concentration of glucose in the blood?

Where is it produced?

A

Hormones insulin and glucagon which are produced by the pancreas

transported thoughout the body via blood vessels

23
Q

Almost all mechanism to maintain homeostasis:

A

negative feedback mechanisms

return a variable to its set point

loop: set point, stimulus -> detected by a sensor -> triggers response to return to the set point (effector)

24
Q

What does insulin do?

A

Insulin decreases blood glucose.
Insulin can bind to receptors on surface of fat, muscle, and liver cells and promote the transport of glucose inside cells.

Glucose Transporter 4 triggered by insulin

25
Insulin decreases blood glucose levels by:
* Stimulating uptake of glucose in muscle * Preventing breakdownof glycogen to glucose in the liver * Stimulates adipose cells to store glucose as fat
26
What does glucagon do?
Glucagon increases blood glucose levels. | the pancreas is stimulated to secrete glucagon
27
Glucagon increases blood glucose levels by:
* Stimulating conversion of glycogen to glucose in the liver * Breakdown of proteins into amino acids in muscle cells * Breakdown of fats in adipose tissue and release of fatty acids
28
# Sugars in food Glucose is rarely found in its monosaccharide form in food. It's often found as part of:
a disaccharide or starch
29
# Sugars in Food What is more commonly found in foods as it's the primary sugar in foods such as fruits, vegetables, and honey?
Fructose
30
# Disaccharides How is a dissacharide formed?
A dissacharide is formed when a dehydration reaction joins 2 monosaccharides. ## Footnote water is a product from the reaction
31
# Lactose Intolerance How is the digestion of disacharides and other carbs mediated?
It is mediated by enzymes synthesized by cells lining the small intestine.
32
# Lactose Intolerance What is Lactose Intolerance the result of?
A drop in *lactase* production | often following childhood