Explanation

 Cysteine is the only amino acid with a sulfhydryl group (-SH), which allows it to form disulfide bonds with another cysteine residue, creating a linkage between two polypeptide chains.

In insulin, disulfide bonds are crucial for maintaining its proper structure and function. 

Explanation

White phosphorus is highly toxic and reactive.

It can ignite spontaneously in air and is harmful to the liver and kidneys.

It’s the most dangerous form of phosphorus.

Explanation

In Simple Harmonic Motion (S.H.M.), frequency is a constant and does not depend on the particle's position (mean or extreme).

• At the mean position, the velocity is maximum, and the acceleration is zero, but the frequency remains constant throughout the motion.

Explanation

N2 (Nitrogen) has the highest critical temperature among the options (Helium - He and Hydrogen - H). 

Nitrogen (N2): While still lower than many other substances

It has a higher critical temperature than Helium because of stronger intermolecular forces. 

Explanation

A molecule is formed when two or more atoms chemically bond together.

While "H" represents the element hydrogen, it is a single atom and not a molecule.

A molecule of hydrogen is represented as H2, where two hydrogen atoms are bonded together. 

Explanation

As a rocket moves upward, its acceleration increases continuously. 

This is because as the rocket burns fuel and expels exhaust gases, its mass decreases.

According to Newton's second law of motion (F = ma), with a constant force (the engine's thrust), a decreasing mass results in an increasing acceleration. 

Explanation

The retention factor (Rf) in chromatography is a unitless value

Because it is calculated as a ratio of two distances (distance traveled by the solute and distance traveled by the solvent), the units of length cancel out. 

Explanation

The ion primarily involved in initiating and regulating muscle contraction is calcium (Ca²⁺).

While magnesium (Mg²⁺) also plays a role in muscle relaxation and overall function,

Calcium is the key player in triggering the contraction process. 

Explanation

Cinnabar is the most common ore of mercury, and its chemical formula is HgS (mercury sulfide).

It has a bright red color and is used to extract mercury.

Explanation

Three types of bus are used.

Address bus: carries memory addresses from the processor to other components such as primary storage and input/output devices. 

Data bus : carries the data between the processor and other components.

Control bus: carries control signals from the processor to other components.