Question

36. glucagon is secreted from pancreatic alpha cells into the blood stream. it can specifically bind to a cell surface receptor and modulate cellular activities of various cell types. glucagon stimulation in humans......
a. leads to activation of protein kinase C
b.is best classified as paracrine signal
c. leads to an increase in blood glucose level
d. results in an increase in glycogen synthesis

8. Which of the following features do not commonly shared among different cancers?
a. Aberrant chromosome numbers (aneuploidy)
b. Failure to elicit apoptosis
c. Abnormal expression of oncogenes
d. High metabolic requirements
e. Chromosomal stability

34.which stage of mitosis starts as sister chromatids split apart and begin to move toward opposite poles?
a. metaphase
b. telophase
c.anaphase
d. prophase
e. prometaphase

17. You have identified a new gene which you suspect is important for apoptosis. The gene is conserved in all systems you have analyzed including yeast, worms, flies, rats and humans. You would like to study the consequences of mutating this gene on the role of apoptosis during development. You only have a simple light microscope, but you are excited because you know that one of these models will allow you visualize changes in whether cells undergo apoptosis or not during development. Which system do you choose for performing your experiments?
a. yeast
b. worms
c. flies
d. rats
e. none of the above

Answer 1

1) Answer: c. leads to an increase in blood glucose level.

Explanation:

Glucagon elevates the glucose concentration by gluconeogenesis and glycogenolysis.

Glucagon increase blood glucose levels by giving signals the liver and releases glucose into the blood.


2) Answer: e. Chromosomal stability

Explanation:

Chromosomal instability defines mutations within the genome and these mutations leads to changes in sequences of nucleic acid, chromosomal rearrangements or aneuploidy.


3) Answer: anaphase

Explanation:

After metaphase, anaphase stage occurs. During this each sister chromatids of chromosome separate and move to opposite poles of the cell.


4) Answer: worm

Explanation:

Researchers use worm to study apoptosis. During apoptosis researchers study embryonic development of a small soil worm which is a nematode called as C. elegans.

Adult worm has only thousand cells and thus researchers work on entire ancestry of each cell.