Explanation

According to the Lock and Key model, the active site is regarded as rigid and specific. 

The Lock and Key model portrays the active site of an enzyme as a fixed, precisely shaped structure that only matches a specific substrate molecule, like a key fitting into a lock

Explanation

Motor neurons stimulate muscles to contract in a reflex arc. 

Motor neurons:

These neurons carry signals from the central nervous system (CNS) directly to muscles, causing them to contract. 

Sensory neurons:

These neurons detect sensory information like pain or pressure and transmit it to the CNS. 

Interneurons:

These neurons connect sensory neurons to motor neurons within the spinal cord, facilitating the transmission of signals in a reflex arc. 

Afferent neurons:

This term is often used interchangeably with sensory neurons, as they both carry sensory information towards the central nervous system. 

Explanation

Eukaryotes divide by mitosis; prokaryotes by binary fission. 

Mitosis: This is the process of cell division in eukaryotic cells, where the nucleus divides into two separate nuclei, followed by the division of the cytoplasm.

Binary fission: This is a simpler process of cell division in prokaryotes, where the cell replicates its DNA and then divides into two identical daughter cells. 

Explanation

Glycogen is a highly branched polysaccharide, a large polymer made up of many repeating glucose units (monomers), which functions as a form of energy storage in animals

Explanation

Chemoreceptors detect chemical stimuli, and olfactory receptors are responsible for detecting smells, which are essentially chemicals in the air. 

Explanation

Uric acid is a less soluble form of nitrogenous waste that is excreted by organisms like birds, reptiles, and insects to conserve water.

This is particularly advantageous in arid environments where water is scarce. 

Explanation

Nerve cells (neurons) are the only cells among the options provided that possess Nissl's granules. 

Nissl's granules, also known as Nissl bodies, are large granular bodies found within the cell body (soma) and dendrites of neurons.

They are composed of rough endoplasmic reticulum (RER) and free ribosomes,

Their primary function is protein synthesis, which is vital for the growth, maintenance, and function of the neuron. 

Explanation

The joint present in the pubis is a cartilaginous joint. 

The pubic symphysis, the joint between the pubic bones, is classified as a cartilaginous joint because it is connected by fibrocartilage, allowing for a small degree of movement. 

Explanation

Arthritis is the inflammation of joints

It is a general term for conditions that cause pain and stiffness in the joints. 

Explanation

The part of the human brain responsible for maintaining posture and balance is the cerebellum. 

The cerebellum, often called the "little brain," is located at the back of the brain

It is primarily responsible for coordinating muscle movements, maintaining balance, and posture.