Explanation

Increasing substrate concentration increases the reaction rate until all active sites are saturated, then the rate of reaction levels off. 

As more substrate molecules are added to a system with a fixed amount of enzyme,

The chance of an enzyme molecule colliding with a substrate molecule increases,

Leading to a higher reaction rate.

However, at a certain point,

All enzyme active sites are occupied by substrate molecules, meaning there are no more available sites for additional substrate molecules to bind.

This saturation point results in a leveling off of the reaction rate, where further increases in substrate concentration won't significantly impact the reaction speed. 

Explanation

An oligosaccharide is made up of three to ten saccharide units

. These chains are larger than disaccharides (two units) and smaller than polysaccharides (ten or more units). 

Examples:

Trisaccharides have three units (e.g., raffinose).

Tetrasaccharides have four units.

Pentasaccharides have five units.

Decasaccharides have ten units. 

Explanation

The statement that best explains the difference between humoral and cell-mediated immune response is: "Humoral immunity involves B-lymphocytes and cell-mediated immunity involves T-lymphocytes". 

Humoral immunity primarily relies on B cells, which produce antibodies to target extracellular pathogens, while cell-mediated immunity involves T cells, which directly attack infected cells or intracellular pathogens. 

Explanation

Organisms encode their genes in long strands of DNA.

It contains the instructions for the development, growth, and function of an organism.

DNA is made up of nucleotides, each consisting of a sugar molecule, a phosphate group, and a nitrogenous base.

Explanation

Oxygen cannot be detected directly in an organic compound using common detection methods, unlike chlorine, nitrogen, and phosphorus.

Explanation

The ostrich has eyes that are larger than its brain.

This adaptation helps the bird have excellent vision.

It especially for detecting predators in its environment.

Explanation

Viruses cannot replicate on their own.

They require a host cell to reproduce, making this statement NOT true.

Explanation

 The addition of salt to water decreases the water potential, but osmotic potential will increase.

Explanation

A trait refers to an organism's physical characteristic, such as hair color or height.

Explanation

Smooth muscles do not line the wall of the heart; this is a characteristic of cardiac muscle. Hence, this statement is NOT true.