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What is the average weight of a typical newborn rat?
A. 5-6 grams
B. 8-12 grams
C. 3-4 grams
D. 1-2 grams ✔✔A. 5-6 grams
What of these anatomical characteristics distinguishes rats from mice?
A. A shorter esophagus
B. Two upper and lower incisors
C. The lack of a gallbladder
D. The presence of premolar teeth ✔✔C. 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