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1. What features of rats make them good experimental models to learn about factors that affect humans?2. What external features of rats are common to all mammals?3. Give 2 examples of how mammals are diverse external characteristics.4. Why do feet, pals, ears of rats not have hair?5. What is the function of the pelage other than insulation?6. Can you suggest a function for vibrissae?7. How lon are the vibrissae in relation to the head and width of the body?8. How to upper incisors mesh with the lower incisors?9. Are any teeth other than incisors present?10. Why is the mouth of a rat referred to as subterminal?11. How does the position of the eyes of a rats head differ from that on a humans head?12. What is the function of the large pinna in rats?13. Are teats exclusively mammalian structures? Why do you think so?14. What term similar to quadruped describes animals such as humans with two leg?15. What digitigrade animals do you racall?16. Are humans plantigrade or digitigrade?17. How does contraction of muscles passing under the zygomatic arch move the manduble in rats?18. What are the relative sizes of the braincases in humans and rats(measure circumference)?19. What does the similarity between the skeletal system of rats and humans suggest about the ancestry of these two mammals?
Estimate the value of the turnover number of the enzyme invertase, given that Rmax (Vmax) for invertase = 15.8 mmol·L-1·min-1 and [E]t = 4.8 ?
Scalloped (sd) wing is an X-linked recessive and ebony (e) body color is an autosomal recessive mutation in Drosophila. What proportion of scalloped, normal body colored males is expected in the F2 starting with a true breeding scalloped female wh..
Of the following, which kingdom contains the most diversity in terms of DNA sequences?
Analysis of preserved leaves shows that the density of stomata per unit area has decreased over the past 200 years. Suggest (and support) a hypothesis that explains this phenomenon.
Do a bit of research on gene splicing, a DNA technology that bioengineers can use to create organisms with traits that never before seen in nature
Why is it more important to use fresh cultures in the coagulase test than in a test medium such as milk agar?
Illustrate the texture and arrangement of the lungs of the cat. If you were asked to create a karyotype from the chromosome spreads you made from HeLa cells, list materials you could use and describe how you would create the karyotype.
Using the two-hybrid system to detect interactions between proteins, you obtain the following results: A clone encoding gene A gave positive results with clones B and C.
You come home to find your Dad and little sister at the kitchen table. You ask them if they would like to go to the movies with you. Neither of them answers you, and you realize that neither of them heard your question.
What offspring phenotypes would you expect from mating between a 15-cm and 30-cm pig. How many pairs of genes are regulating the tail length character? (Hint: count the phentotypic classes, or find out the sum of the ratios of the classes)
Explain why it is very important to have a pure culture and not a mixed culture when performing biochemical tests.
Calculate the number of ATPs generated from one saturated 10-carbon fatty acid. For this question, assume that each NADH molecule generates 2.5 ATPs and that each FADH2 molecule generates 1.5 ATPs.
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