rats and mice ap

Question 1

rats and mice have tails that are longer than their body length (T/F)

Answer 1

true

Question 2

rats have a gallbladder (T/F)

Answer 2

false

Question 3

the inguinal canal in males remains open throughout life (T/F)

Answer 3

true

Question 4

mice and rats typically breed during daylight hours (T/F)

Answer 4

false

Question 5

secretions from the harderian gland in rats is commonly called _____

Answer 5

red tears

Question 6

brown fat, commonly called _____ is located around the ____, and ____. it provides roughly __ times the energy storage as other fats

Answer 6

hibernation tissue, neck, scapulae, 10

Question 7

gestation for mice is _____ days and ____ days for rats

Answer 7

19-21, 21-23

Question 8

mice reach puberty at __ weeks and rats at ____ weeks

Answer 8

5, 5-9

Question 9

the average lifespan of mice is ____ and ___ for rats

Answer 9

1-3, 2-3

Question 10

the normal TPR for mice

Answer 10

T - 98.6, P - 427 - 697, R - 91 - 146

Question 11

the normal TPR for rats

Answer 11

T - 98.6, P - 313 - 493, R - 71 - 146

Question 12

rats and mice have __ digits on the forelimbs, and ___ digits on the hindlimbs

Answer 12

4,5

Question 13

female rats have ___ pairs of mammary glands, they are found in the ____ and ___ areas

Answer 13

4-6, thoracic, inguinal

Question 14

female mice have ___ pairs of mammary glands, they extend to the ___ and ____

Answer 14

5, sides and back

Question 15

male mice also have mammary glands but their nipples are

Answer 15

insignificant

Question 16

the uterus of mice and rats is considered to be ____ and each uterine horn has a separate ______

Answer 16

bicornuate, cervical canal

Question 17

female mice and rats are ______ ovulators, and they are considered ______ with their estrous period lasting ____ days

Answer 17

spontaneous, continuously polyestrous, 4-5 days

Question 18

in mice and rats the postpartum estrus occurs roughly ___ hours after parturition

Answer 18

20-24

Question 19

the presence of a copulatory plug can be used to confirm _____

Answer 19

breeding

Question 20

mice and rats have ____ teeth

Answer 20

hypsodont

Question 21

___ animals are the direct result of mating between two different inbred strains

Answer 21

hybrid

Question 22

_____ strains develop as a result of genetic mutation in existing strains. the mutation is then carried on in future generations

Answer 22

coisogenic

Question 23

___ strains are those in which a mutation that arises in one strain is transferred to another strain through a series of backcross mating. nude animals were developed

Answer 23

congenic

Question 24

a ___ is a mouse whose DNA has been modified so that it does not express particular proteins

Answer 24

knockout mouse

Question 25

why cant rats vomit

Answer 25

the limiting ridge separates the 2 portions of the stomach, covers the opening from the esophagus

Question 26

unique structure of the rats lungs

Answer 26

divided unequally, left lobe is smaller and single, the right lobe is larger and divided into 4 sections

Question 27

what is a copulatory plug and how long does it remain in place

Answer 27

when dried semen mixes with secretions from the vagina, 12-24 hours after mating

Question 28

chromodacryorrhea is

Answer 28

normal red secretions of the eyes, commonly occurs when the animal is stressed

Question 29

purpose of tails

Answer 29

organ of balance and helps with heat loss

Question 30

rats pancreas

Answer 30

highly diffuse, located throughout the mesentery, many ducts that supple digestive enzymes to the small intestine

Question 31

what is an intensive breeding program for mice and rats

Answer 31

continuous housing of male and female animals

Question 32

what is a non intensive breeding program

Answer 32

separate housing for the males and females while pregnant

Question 33

what is the bruce effect

Answer 33

when a prego mouse is exposed to a new male (odor) within 4 days of breeding, the existing pregnancy will be aborted and female returns to estrus

Question 34

what is the whitten effect

Answer 34

when females are exposed to a male / odor, they will begin estrus within 3 days

Question 35

what is a stock bred animal

Answer 35

a mouse/rat that has been randomly bred

Question 36

when is an inbred animal considered a strain

Answer 36

when atleast 20 gens of parent offspring matings have occured

Question 37

5 ways to ensure genetic purity

Answer 37

protein electrophoresis, serologic testing, mandible measurements, backcross mating, tissue transplants

Question 38

what is a transgenic animal

Answer 38

an animal who has had some DNA removed from one strain and is inserted into an ovum after fertilization

Question 39

why do we use mice and rats in research

Answer 39

they have a well characterized genetic makeup, and can be bred to be specifically susceptible to certain diseases