ALAT practice exam unit 5 Questions with Correct Answers
Which of the following statements regarding outbred mice is FALSE?
A. Outbred mice have been bred for maximum heterozygosity
B. Outbred mice have a stable overa
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ALAT practice exam unit 5 Questions with Correct Answers
Which of the following statements regarding outbred mice is FALSE?
A. Outbred mice have been bred for maximum heterozygosity
B. Outbred mice have a stable overall genetic makeup
C. Outbred mice all share the same genes as every other mouse in the population
D. Outbred mice are created by mating a closed population (animals of at least 4
generations) of unrelated animals ✔✔ C. Outbred mice all share the same genes as
every other mouse in the population
T/F: Mice less than 10 days of age may be caught by cupping the hands around the
whole body or by picking up a group of pups together with a small amount of nesting
material ✔✔ True
T/F: Both respiration and heart rate in the mouse are easily measured by observing or
feeling the chest ✔✔ False
T/F: An acceptable management technique that may reduce or prevent fighting among
male mice housed together is to house young males together from weaning ✔✔ True
T/F: The F1 on the end of a hybrid designation indicates that this is the second
generation ✔✔ False
T/F: Inbred strains usually have larger litters than outbred stocks ✔✔ False
T/F: By 7 days of age, mouse pups are fully furred and their eyes are open ✔✔ False
What are hybrid mice? ✔✔ The offspring of two different strains of mice
Male neonate mice can be distinguished from females by their: ✔✔ Larger anogenital
distance
List 5 signs of pain, distress, or illness in mice: ✔✔ Ruffled coat, hunched, not moving,
weight loss, dehydration, staining near the eyes
Weight of an adult male mouse in grams: ✔✔ 20-40 grams
Average lifespan of a mouse: ✔✔ 12-36 months
Gestation length of a mouse: ✔✔ 19-21 days
List 3 forms of environmental enrichment commonly given to mice: ✔✔ group housed,
wooden blocks, and treats
Skin tenting and sunken eyes are signs of what health problem? ✔✔ DehydrationWhat is the scientific name of the common house mouse? ✔✔ Mus Musculus
Newborne mice are born _________ meaning that they are born hairless with eyes and
ear canals closed ✔✔ Altricial
List 3 examples of permanent methods of identifying mice: ✔✔ Tattoos, chips, and
ear/toe clippings
What is the term for coming into heat 24 hours after giving birth? ✔✔ Post partum
estrus
What is the approximate normal body weight for male and female rats? ✔✔ Males 300-
500 grams and Females 250-300 grams
What anatomical feature distinguishes rats from mice? ✔✔ The lack of a gallbladder
Which rat is albino, has a wide head, long ears, and a tail that is half its body length?
A. Sprague- Dawley
B. Wistar
C. Long- Evans
D. Fischer ✔✔ B. Wistar
T/F: Male rats cannot be pair housed or they will fight ✔✔ False
T/F: Molar teeth of rats grow constantly ✔✔ False
T/F: Rats are nocturnal and are never active during the day ✔✔ False
T/F: Red staining around the eyes and nose is due to porphyrin, a secretion that can be
normal ✔✔ True
T/F: Toe clipping is the recommended identification method for adult rats ✔✔ False
Rats can be tickled by caretakers, reducing stress during handling and restraint ✔✔
True
What are two common types of inbred strains of rats? ✔✔ Fischer 344 and Lewis
Which rat stock is also known as the hooded rat? ✔✔ Long evans
What problem can occur if you pick rats up by the tip of the tail? ✔✔ Degloving
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