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.

TLS Online TPP Program

#Question id: 33701

#Unit 2. Cellular Organization

Select all correct options 

A. Satellite DNA has a very short repeating sequence and no coding function.

B. Satellite DNA occurs in small blocks that can have distinct physical properties.

C. Satellite DNA is often the major constituent of facultative heterochromatin.

TLS Online TPP Program

#Question id: 33702

#Unit 2. Cellular Organization

Choose true and false

A. Repetitive DNA is characterized by its relatively slow rate of renaturation.

B. Satellite DNA consists of very large sequences repeated many times in tandem in large clusters.

C. In humans, the α satellite family, found in centromeric regions, has a repeat unit length of 171 bp.

D. In mammalian genomes satellite DNA is less than 10%, but in the fruit fly Drosophila virilis, it amounts to 50%.

TLS Online TPP Program

#Question id: 33703

#Unit 2. Cellular Organization

What will be the buoyant density of a duplex DNA having 60% GC sequences

TLS Online TPP Program

#Question id: 33704

#Unit 2. Cellular Organization

Find true and false statements

A. Tandemly repeated sequences are liable to undergo misalignments during chromosome pairing

B. The sizes of tandem clusters tend to be homozygous in population

C. The smaller clusters of tandemly repeated sequences can be used to characterize individual genomes

TLS Online TPP Program

#Question id: 33705

#Unit 2. Cellular Organization

Choose combination of correct statements 

           

A. The main band contains 92% of the genome

B. The main band contains 10% of the genome

C. Smaller peak represents 30% GC content of genome

D. Smaller peak represents 60% GC content of genome

TLS Online TPP Program

#Question id: 33706

#Unit 2. Cellular Organization

The satellite DNA of the mouse M. musculus is digested by the enzyme EcoRII into a series of bands, including a predominant monomeric fragment of