Question

39) Most of the enzymes for the TCA cycle are located ________ while most of the electron transport chain complexes are located________.

a. in the mitochondrial matrix; in the inner mitochondrial membrane

b. in the inner mitochondrial membrane; in the cytosol

c. in the cytosol; in the mitochondrial matrix

d. in the cytosol; in the inner mitochondrial membrane

e. in the mitochondria matrix, in the outer mitochondrial membrane

41) Which of the following statements about cancer is true?

a. cancer cells have number of mutations contributing to abnormal growth

b. different cancer types arise from different cell types

c. different cancer patients have different genetic changes contributing to their cancer, even if they have the same type of cancer

d. most patients who die from cancer, die from metastatic cancer

e. all of the above answers are true

Answer 1

39.Krebs/TCA cycle occurs in mitochondrial matrix, hence the enzymes required for the cycle are also present here.ETC(electron transport chain) complex is located in the inner mitochondrial membrane.Therefore the right answer is option a.

Option b is wrong because TCA enzymes are not present in inner mitochondrial membrane.

Options c and d are wrong because TCA enzymes are not present in in cytosol.

Option e is wrong because ETC complexes are not present in outer mitochondrial membrane.

40. Option a is true because studies show that between one and ten mutations are required for a healthy cell to turn cancerous.

Option b is true.Pancreatic cancer arise from pancreatic cells while skin cancer arises from skin.

Option c is true because same cancer can arise from mutations in different set of genes.

Option d is true because metastatic cancer has very less survival rate.

Options a, b, c and d are true.Therefore option e is the right answer.