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

• In protein synthesis, the initiation of a polypeptide chain is typically started by an amino acid called methionine (Met).
• This is because methionine has a special tRNA (transfer RNA) that recognizes the start codon (AUG) on the mRNA (messenger RNA) and initiates protein synthesis.

Explanation

• Endotoxin is a component of the outer membrane of Gram-negative bacteria, and it is specifically associated with the presence of Lipopolysaccharides (LPS).
• LPS is a complex molecule composed of a lipid A anchor, a core oligosaccharide, and a repeating O-antigen polysaccharide chain. 
• The lipid A portion of LPS is responsible for its endotoxic activity, which can trigger a strong immune response and cause septic shock.

Explanation

The major component of the troposphere is nitrogen, which makes up about 78% of the air in this layer

The troposphere also contains a significant amount of oxygen (around 21%)

Smaller amounts of other gases like argon, water vapor, and carbon dioxide. 

Explanation

Endocardium lines the inner chambers of the heart.

Myocardium is the thick, muscular middle layer responsible for contraction.

Epicardium is the outermost protective layer.

Together, these three layers make up the complete structure of the heart wall.

Explanation

Day-neutral plants like tomato flower regardless of day length (photoperiod).

They are not dependent on specific light or dark durations for flowering.

Explanation

During prophase, the cytoplasm becomes more viscous to help stabilize the cell as chromosomes condense and the spindle apparatus begins to form.

This change supports the reorganization of cellular components needed for mitosis.

Explanation

Explanation

Viruses cannot perform life processes like excretion, as they lack cellular structures and metabolism.

Explanation

Another name for the knee-chest position is genupectoral position.

It is used in medical situations such as gynecological exams, lumbar spine surgery, and labor to address issues like a prolapsed cord.