C++ | MCQs

Explanation

The true statement about Acute Myeloid Leukemia (AML) among the options provided is More than 20% blasts for diagnosis.

AML is characterized by the proliferation of myeloid precursor cells (blasts) in the bone marrow, typically comprising more than 20% of the nucleated cells.

Explanation

Facial nerve paralysis typically cannot be directly detected on a CT (computed tomography) scan.

A CT scan can help identify potential causes of facial nerve paralysis, such as tumors 

Explanation

The familial cancer syndrome that exhibits autosomal recessive inheritance among the options listed is "Fanconi's anemia."

It is a rare genetic disorder characterized by bone marrow failure and physical abnormalities.

It is inherited in an autosomal recessive pattern, which means an individual must inherit two copies of the mutated gene (one from each parent) to develop the disorder.

The other syndromes listed—ataxia telangiectasia, Bloom's syndrome, Wilson's tumor, and xeroderma pigmentosa

typically exhibit autosomal recessive or autosomal dominant inheritance patterns

Explanation

The junction of the cornea and sclera is known as the "limbus."

This region marks the transition between the transparent cornea at the front of the eye and the opaque sclera that forms the white outer layer of the eyeball.

It is an important anatomical landmark

They play a role in various eye functions, including:

• the attachment of the iris 
• the drainage of aqueous humor from the eye.
  

Explanation

Completed family size (CFS) is a cohort measure of fertility.

It indicates the average number of children a woman aged 30 in that year is projected to have.

The total fertility rate (TFR) is a period measure of fertility.

Explanation

• The syncytial theory, also known as the "syncytial hypothesis," proposes that metazoa (multicellular animals) evolved from a single, giant cell or syncytium.
• According to this theory, the first metazoan was a large, multinucleate cell that eventually gave rise to multiple cells, leading to the development of multicellularity.

Explanation

• Coronaviruses get their name from the crown-like shape of the viral particles, which have a distinctive "corona" or halo of protein spikes on their surface.
• These spikes give the virus its characteristic appearance under an electron microscope, resembling a crown or a halo.
• This is why the name "coronavirus" was chosen, as it reflects the virus's unique morphology.

Explanation

• The mesoglea is a thin, gelatinous layer of tissue in Hydra that lies between the outer epidermis and the inner gastrodermis.
• It is a cell-free, acellular layer that provides structural support and flexibility to the body.
• The mesoglea is composed of a matrix of glycoproteins and proteoglycans, but it does not contain any cells.

Explanation

• Contractile vacuoles are specialized organelles found exclusively in protozoa, such as amoebae and paramecia.
• They are responsible for osmoregulation, removing excess water and ions from the cell to maintain proper cellular turgor pressure.
• Contractile vacuoles are able to contract and expand to expel water and waste from the cell.

Explanation

• Cytotoxic T cells are a type of T lymphocyte that plays a crucial role in eliminating infected cells or tumor cells from the body.
• They recognize and bind to specific antigens presented on the surface of infected cells or tumor cells, and then release cytotoxins, such as granzymes and perforin, which form pores in the plasma membrane of the target cell, leading to cell lysis and death.