Cell Biology Answers

Within the cell, isocitrate dehydrogenase, an enzyme of the citric acid cycle, is located in the

A colorimeter is an instrument used for chemical analysis by comparing a liquid’s color with standard colors. In an experiment, a scientist used two colorimeters and noted the readings. The first colorimeter showed consistent readings that were five points lower than the actual reading. The second colorimeter provided readings that were the same as the actual reading. Which two statements are implications of these readings?

define all the cell organelles with their discovery.

The Ras protein functions as a molecular switch that is set to its “on” state by other proteins that cause it to release its bound GDP and bind GTP. A GTPase-activating protein helps reset the switch to the “off” state by inducing Ras to hydrolyze its bound GTP to GDP much more rapidly than it would without this encouragement. Thus, Ras Works like a light switch that one person turns on and another turns off. You are studying a mutant cell that lacks the GTPase-activating protein. What abnormalities would you expect to find in the way in which Ras activity responds to extracellular signals?

Testosterone in humans shapes the formation of the external genitalia and influences brain development in the fetus; at puberty, the hormone triggers the development of male secondary sexual characteristics.

Assume that you are a genetic counsellor and you have a case who is genetically male but developed as a female. What could be the defect in this case? How would you explain the situation to the case?

Please explain the refulation of dynamic structure of microtubules?

The events which occur in both mitosis and meiosis are similar except during

• The first interphase

• chromosomal duplications

•none of these choices

•anaphase

A skin cell of a mouse has 22 chromosomes. How many chromosomes would you expect to find in

a) an unfertilized egg cell of a mouse

b) A zygote of a mouse

Embryonic stem cells are cells derived from an embryo. These cells can be used to create new tissues for patients suffering from certain illnesses and disorders. Which statement best summarizes why the use of embryonic stem cells could be seen as unethical?

Name two similarities and two differences between the cellular processes of importing protein into the ER and importing protein to the nucleus.