I. Adrenocortical secretion is controlled primarily by ACTH, from the anterior pituitary, but mineralocorticoid secretion is also subject to independent control by circulating factors.

II. Adrenal medullary hormones work mostly to prepare the body for emergencies, the so-called “fight-or-flight” responses.

III. All three cortical zones secrete corticosterone, but the active enzymatic mechanism for aldosterone biosynthesis is not limited to the zona glomerulosa.

IV. An important function of the zona glomerulosa, in addition to aldosterone synthesis, is the formation of new cortical cells.

#Question id: 26569

#Unit 3. Fundamental Processes

#Question id: 26570

#Unit 3. Fundamental Processes

#Question id: 26571

#Unit 3. Fundamental Processes

Which of the following is required to initiate modifications of histone H3 (deacetylation of K9 and K14, followed by methylation of K9) in human

#Question id: 26572

#Unit 3. Fundamental Processes

Choose the following is incorrect statement about Polycomb or Pc-G proteins

a. Pc-G proteins do not initiate repression

b. Pc-G proteins initiate repression

c. They are responsible for maintainingrepression 

d. There are Polycomb repressive complexes: PRC1 and PRC2

e. PRC2 complexes contain histone deacetylases that inhibit transcription

f. PRC1 complex binds the methylated nucleosomes 

g. The PRC1 complex contains a ubiquitin ligase 

#Question id: 26573

#Unit 3. Fundamental Processes

#Question id: 26574

#Unit 3. Fundamental Processes

Which of the following is incorrect about De novo methylase & Perpetuation methylase

a. De novo methylase recognises unmethylated strand and methylated at single strand 

b. De novo methylase recognises unmethylated strand and methylated at single strand 

c. Perpetuation methylase recognises hemimethylated strand and methylated at both strand 

d. Perpetuation methylase recognises unmethylated strand and methylated at one strand