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Ruminant Nutrition > Nutrition Exam 1 > Flashcards

Nutrition Exam 1 Flashcards

1
Q

If you were giving a presentation to third grade students on nutrition, how would you define nutrition?

A

Nutrition is the way food is broken down in a chemical and physical sense to get the necessary things, like nutrients from the food eaten, to help with growth, health and maintenance.

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2
Q

What are the four major processes involved in nutrition?

A

Ingestion
Digestion
Absorption
Metabolism

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3
Q

What are the major classes of nutrients?

A 
Carbohydrates
Protein
Lipids
Vitamins
Minerals
Water
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4
Q

True or False. Energy is a nutrient.

A

False - energy is a property of it

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5
Q

Nutrients are any substance(s) in food that a living organism uses to obtain ___________, synthesize ____________, or regulate ____________ processes.

A

Obtain Energy
Synthesize Tissue
Regulate Metabolic Processes

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6
Q

List two examples of nutrients that cannot be replaced by other nutrients.

A

Minerals

Vitamins

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7
Q

What makes a nutrient an essential nutrient?

A

a nutrient that has to be from the diet and can’t be synthesized by body or in proper amounts

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8
Q

What makes a nutrient a nonessential nutrient?

A

a nutrient not needed in the diet and can be synthesized by body in proper amoutns

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9
Q

List four macro-nutrients.

A

Carbohydrates
Proteins
Lipids
Water

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10
Q

List two micro-nutrients.

A

Vitamins

Minerals

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11
Q

Define Herbivores

A

plant eaters

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12
Q

Define Carnivores

A

meat eaters

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13
Q

Define Omnivores

A

plant and meat eaters

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14
Q

List two examples of autoenzymatic digesters

A

Pandas
Pigs
Cats

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15
Q

List two examples of alloenzymatic digesters each.

A

Cattle
Deer
Sheep

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16
Q

Name three of the digestive tract accessory organs?

A

Pancreas
Liver
Salivary Glands

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17
Q

The stomach, small intestine, and large intestine all have these layers of tissue, including: epithelium, lamina propria, and muscularis mucosa. Collectively these three tissues are known as the __________.

A

Mucosa

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18
Q

Pancreatic _____ cells produce ____________ and pancreatic __________ cells make _____________.

A

duct cells produce bicarbonate and pancreatic acinar cells produce enzymes

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19
Q

What transports absorbed nutrients to the liver?

A

Liver Lobules

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20
Q

Illustrate or describe the difference between the apical brush boarder and basolateral brush boarder membranes of the epithelial cell.

A

Apical Brush Border is the surface of the villi covered in microvilli that contains tight junctions that connect cells to one another. The Basolateral Brush Border is the bottom part that has Intracellulor Spaces that are wider with the Sodium pump located there.

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21
Q

Name the accessory digestive tract organ that has the ability to make its own glucose when necessary.

A

Liver

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22
Q

The pancreas has endocrine and exocrine function. What are the main products of the endocrine pancreas and exocrine pancreas?

A 
Endocrine = cells that make hormones that enter blood
Exocrine = pancreatic asinar cells that produce enzymes
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23
Q

The absorptive cells for the small and large intestines are different. What are those cells called?

A 
SI = Enterocyte 
LI = Colonocyte
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24
Q

Both the small and large intestines have cells that produce mucus, what is this cell called?

A

Goblet Cell

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25
Q

List the stomach cell type that produces hydrochloric acid.

A

Parietal Cell

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26
Q

Differentiate between a holoenzyme and apoenzyme.

A

Apoenzyme: catalytically inactive protein part without the cofactors
Holoenzyme: catalytically active

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27
Q

What are enzyme cofactors?

A

inorganic ions

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28
Q

Give a specific example of a cofactor.

A

metals = Magnesium

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29
Q

Give a specific example of a coenzyme.

A

organic molecules = NAD/NADH

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30
Q

here are six classes of enzymes. Name and describe the action of each enzyme class.

A 
Oxidoreductases = oxidation reduction reaction
Transferases = transfer of functional groups
Hydrolases = hydrolysis reaction
Lyases = group elimination to form double bonds or addition to double bonds
Isomerases = isomerization of substrate
Ligases = bond formation coupled with ATP hydrolysis to provide energy
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31
Q

What is an active site?

A

where biochemical reactions are catalyzed

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32
Q

In general, how does an enzyme influence the substrate and the rate of the reaction and product formation? (Why are enzymes catalyst for reactions?)

A

The enzyme brings the substrate and catalytic sites together and holds it in a specific way that allows the two to be catalyzed where the energy barrier is lowered

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33
Q

Compare and contrast absolute and relative enzyme specificity.

A

Absolute Specificity = action on only one substrate

Relative Specificity = action on a group of substrates

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34
Q

Describe the two active site models.

A

Lock and Key model = for absolute specificity

Induced Fit model = flexible active site that molds to substrate shape

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35
Q

True or False. If a substrate has chirality, an enzyme can use both chiral isomers for the reaction.

A

False : only one

36
Q

How are enzymes activity controlled and regulated?

A

Substrate Concentration
Allosteric Control
Covalent Modification
Environmental factors

37
Q

You purchased in July, 2019 a sack of β-glucanase enzyme to feed to pigs that are being fed corn. Due to a shipping mishap the order was delivered to you in Las Cruces on a Saturday and you were gone for the weekend. The purchase sat on your unshaded doorstep for the weekend. Do you have any reason to suspect the activity of the enzyme and why?

A

Yes, because enzyme catabollyc rate are affected by the temperature of the environment which would have lead to being out in the sun and heat constantly.

38
Q

Describe allosteric effects and how they influence enzyme activity.

A

there are allosteric activators and inhibitors that can affect the binding of a molecule at one site while also affecting the binding of a molecule at another

39
Q

Explain enzyme inhibition and the different types of inhibitors.

A 
Competitive = one that resembles the substrates and binds instead preventing bonding
Non-competitive = reduces activity by bonding enzyme even if already bound
Uncomptetitve = (RARE) binds after enzyme and stops the reaction
40
Q

There are three types of inhibitors. Two of the inhibitors have an inhibitor site on the enzyme. What are those two inhibitors called?

A

Non-competitive and Uncompetitive

41
Q

How does covalent modification regulate enzymes? Include at least two examples of covalent modification in your answer.

A

when covalent bonds are broken on a protein or when a functional group is added/removed
ex; methylation and phosphorylation

42
Q

Why is it important that enzymes are produced in an inactive form and which organ would be in immediate danger if enzymes were produced in an active form?

A

must be inactive form so that they do not digest the pancreas

43
Q

What stimulates the digestive glands to secrete gastrointestinal juice and enzymes?

A

nerves and hormones

44
Q

Define hormone.

A

biological messenger that is transported into tissue fluids to stimulate specific cells/tissue

45
Q

How do hormones work?

A

alter function of cells by binding to specific receptor proteins in target cells

46
Q

List three gastrointestinal hormones that are crucial to digestion.

A

Gastrin
Cholecystokinin
Secretin

47
Q

Gastrin is secreted from the __-______ in the gastric pits of the stomach.

A

G - Cells

48
Q

Briefly diagram or describe what causes gastrin secretion. What stimulates gastrin release?

A

when food is put in the mouth and to the stomach then neurological and chemical signals cause release of gastrin

49
Q

Where is somatostatin produced (hint: there is more than one)?

A

D-Cells in gastric pits of pyloris

Secreted by Pancreas and Central Nervous System

50
Q

Somatostatin inhibits other hormones. Name the hormones somatostatin inhibits.

A

Inhibits gastrin, insulin and glucagon

51
Q

Where is secretin produced?

A

S-cells in crypts of Lieberkuhn

52
Q

What stimulates cholecystokinin release?

A

chyme rich in AA, triglycerides and fatty acids enter the small inestine

53
Q

Compare and contrast the regulatory phases of gastrointestinal secretions.

A

Gastric Inhibitory Peptide = from K-cells when rich chyme enters SI it inhibits gastric acid secretion, releases insulin by pancreatic beta cells and lipogenesis by adipose tissue
Vasoactive Intestinal Peptide = from Enteroendocrine cells in SI crypts of lieberkuhn when chyme enters SI and stimulates secretion of electrolytes, water and bicarbonate

54
Q

Classify the following sugars as either an aldopentose, aldohexose, or ketohexose
accordingly. D-Xylose, D-glucose, D-fructose, and L-Arabinose. Then circle the sugar(s) that
are structural carbohydrates.

A 
D-Xylose = Aldopentose
D-glucose = Aldohexose 
D-fructose = Ketohexose
L-Arabinose = Aldopentose
55
Q

What are the products in the digestion of maltose, sucrose, lactose, starch, and
raffinose?

A 
Maltose = alpha 1.4 glucose-glucose
Sucrose = alpha 1,2 beta glucose-fructose
Lactose = beta 1,4 galactose-glucose
Raffinose = galactose-glucose fructose
56
Q

Name three volatile fatty acids in the order from most carbon to least carbon.

A

Pollysaccharides
Oligosaccharides
Monosaccharides

57
Q

List two homoglycans and two heteroglycans.

A 
Homoglycans = Arabinan and Xylan
Heteroglycans = Hemicellulose and Pectin
58
Q

Discuss the advantages and disadvantages to non-ruminants consuming fiber.

A 
Dis = causes bloating, gas and decrease in nutrient digestion
Ad = increase mucus secretion, production of VFAs, hypocholesterolmeia, glucose tolerance effect, fecal bulking effect
59
Q

What is the function of salivary α-amylase?

A

cleaves alpha 1,4 glycosidic linkages
cleaves amylose to maltose
minor role in time food is in mouth
alpha 1,4-endoglycosidase

60
Q

Circle which species has salivary α-amylase: ruminants, horse, human, dog, cat, pig.

A

man

pig (weak)

61
Q

What is the difference between salivary and pancreatic α-amylase?

A

Salivary: secreted by parotid salivary glands
Pancreatic: secreted by pancreatic acinar cells and cleaves amylose to maltose AND maltotriose

62
Q

What is the enzyme called that can digest amylopectin’s alpha1,6 bonds?

A

isomaltase

63
Q

. Describe the role of brush border enzymes in the digestion of carbohydrates. Do all
species have the same brush border enzymes?

A

all have maltase, and isomaltase
ruminants don’t have sucrase: breaks glucose and fructose
poultry don’t have lactase: breaks lactose ad galactose

64
Q

How is carbohydrate digestion different in ruminant versus non-ruminant herbivores?
Which one utilizes nutrients better?

A

Nutrient supply depend on the sequence of mammalian versus microbial digestion
Ruminants are better because use microbial metabolism endproducts better

65
Q

What attributes make the rumen a good fermentation vat?

A

minimal oxygen
constant temp 37-42 C
pH regulated at 5.5-7.2

66
Q

How does the symbiotic relationship between host animal and anaerobic microbes
work?

A

Anaerobic enzymes provide enzymes capable of digesting structural carbohydrates
Nutrients for host: energy, protein, vitamins

67
Q

What happens to excess hydrogens that are a by-product of microbial fermentation?

A

Methanogenesis

68
Q

What types of ruminal microbes are involved in the digestion of carbohydrates?

A

Bacteria
Protozoa
Fungi

69
Q

Name a rumen bacterium (spelled correctly) that degrades plant fiber and the
fermentation end products that result

A

Ruminococcus flavefaciens

70
Q

Name a rumen bacterium that degrades starch and the fermentation end products that
result

A

Strepticoccus bovis

71
Q

Name a rumen bacterium that degrades starch and the fermentation end products that
result

A

Strepticoccus bovis

72
Q

How do the proportions of VFAs differ with diet?

A

Forage diet = greater acetate to propionate

Grain diet = lower acetate to propionate

73
Q

Describe absorption of VFAs in the ruminant.

A

Passive diffusion absorbs from rumen to portal blood

74
Q

How much energy is provided to a ruminant from VFAs?

A

70%

75
Q

What is the primary site of VFA absorption in ruminants?

A

small intestine

76
Q

Define passive transport.

A

facilitated diffusion going down the concentration gradient

77
Q

Discuss why the Na+K+ATPase pump is important to nutrient absorption. Include information on where the Na+K+ATPase pump is found and action. Be specific.

A

found in basolateral membrane of absoprtion cells found in intestinal epithelium and links energy to absorb/secretion process
Creates electro-chemical gradient and transports 3Na+ out and 2K- in causing the inside of the cell to be negative and have a low count of Na

78
Q

Define SGLUT1

A

sodium dependent glucose transport = active

79
Q

Define GLUT5.

A

glucose transport 5 transports fructose not glucose lumen into the cell

80
Q

Define GLUT2.

A

glucose transport 2 transmembrane carrier protein that allows protein facilitated glucose movement across cell membranes

81
Q

. GLUT2 is found in the basolateral membrane of the enterocyte and several other
tissues throughout the body. Name 2 other tissues where GLUT2 is found.

A

kidney cells
pancreatic
intestinal

82
Q 
Does VFA absorption, in the ruminant, remain unchanged? If not, how can VFA
absorption change (increase/decrease)?
A

If a ruminant on high plan of nutrition with abundant VFAs then they have a long papillae

83
Q

Why are butyrate concentration very low in the blood?

A

80% of the butyrate absorbed transfomrs into 5-hydroxybutyrate that goes into the blood

84
Q

Volatile fatty acids are produced in the rumen due to fermentation. Name the 3
predominant VFAs produced and how are they used in the body.

A

Acetate
Propionate
Butyrate

85
Q

Differentiate between glycolysis and gluconeogenesis

A

glycolysis: breaks down glucose into pyruvate, ATP and NADH
gluconeogenesis: breakdown of glycogen into glucose

86
Q

What is the major purpose of the pentose phosphate pathway?

A

produces ribose-5-phosphate to make RNA and DNA

produces NADPH to help build other molecules

Ruminant Nutrition (5 decks)

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