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Flashcards in Exam 2 Deck (80)
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1

Rigor mortis is due to

Lack of ATP in post mortem muscle
Formation of actin myosin cross bridges

2

Protein denaturation

Occurs when ph declines rapidly while muscle is still warm
Causes change in protein conformation and or function

3

Resolution of rigor occurs due to

Proteolytic dissolution of the z disks

4

Dissolution of the myostatin gene

Causes extreme or double muscled cattle

5

The callipyge gene

Causes higher muscle calpstatin levels

6

Rendement Napole (RN)

Leads to altered AMPK

7

Halothane (Hal) gene

encodes for mutated SR calcium change proteins

8

The calpain enzyme system is

most active at neutral ph
primarily responsible for improvements in tenderness during aging
requires calcium for activity

9

Feed withdrawal prior to slaughter is important to

reduce transport weight
reduce excreta during transport
reduce risk of gastral intestinal track lacerations
decrease cost of handling digesta

10

Which of the following affect stress when moving animals

loading ramp design
moving objects
shadow/ lighting
alley way flooring design

11

Rigor mortis is stiffening of death

true

12

Myoglobin is the pigment responsible to 80-90% of the color of meat

true

13

Rigor mortis onset is typically faster in pork than in lamb or beef muscle

true

14

shorter sarcomeres are correlated with tougher meat

true

15

The enzyme m-calpain requires millimolar calcium for activity

true

16

Pyruvate contains 4 carbon atoms

false

17

Three USDA approved methods of stunning include: physical (captive bolt), CO2, and electrical

true

18

According to the text, Halal and Kosher ritual slaughters do not allow stunning prior to exsanguination

true

19

The two largest contributors to postmortem changes are deviation in tissue temp and ph

true

20

Lactic acid is frequently used as carcass antimicrobial

true

21

DFD

dark, firm, dry

22

PSE

pale, soft, exudative

23

pH

=-log[H+]

24

ATP

Adenosine triphosphate

25

ADP

Adenosine diphosphate

26

PSS

Porcine Stress syndrome

27

rigor mortis

stiffness of death

28

glycogen assimilation

glycigenisis

29

glycogen breakdown

glycogenolysis

30

glucose storage form in muscle (muscle starch)

glycogen