ALAT ALAT Species-Specific Care and Experimental Models Questions and Answers 3

Question 1

Which of the following best describes a transgenic mouse?

Accepted Answer

A mouse whose genome has been altered to contain foreign DNA or modified genes

Answer

Transgenic mice carry artificially introduced or modified genetic material, enabling researchers to study gene function and model human diseases.

Question 2

What is the primary purpose of ear notching or ear tagging in laboratory rodents?

Accepted Answer

To provide permanent individual identification for research tracking

Answer

Ear notching and ear tags provide permanent, individual identification necessary for accurate data tracking in research studies.

Question 3

Which condition is commonly seen in aged female rats and is characterized by mammary tissue growths?

Accepted Answer

Mammary fibroadenoma

Answer

Mammary fibroadenomas are common benign tumors in aged female rats, frequently observed as palpable subcutaneous masses.

Question 4

In a Xenopus laevis (African clawed frog) colony, what is the recommended approach to prevent chytridiomycosis spread?

Accepted Answer

Quarantine new animals and practice strict biosecurity to prevent Batrachochytrium dendrobatidis introduction

Answer

Strict quarantine and biosecurity measures are the primary strategy to prevent introduction of Batrachochytrium dendrobatidis, which causes the fatal chytridiomycosis in amphibians.

Question 5

What is 'ringtail' in laboratory rats and what environmental condition causes it?

Accepted Answer

Annular constrictions of the tail caused by low humidity

Answer

Ringtail is a condition in young rats characterized by annular constrictions and necrosis of the tail, caused by low relative humidity in the housing environment.

ALAT - Assistant Laboratory Animal Technician Practice Test

ALAT - Assistant Laboratory Animal Technician Practice Test

ALAT ALAT Species-Specific Care and Experimental Models Questions and Answers 3