Explanation

In a DNA molecule, adenine (A) always pairs with thymine (T) through two hydrogen bonds.

This specific pairing maintains the structure and stability of the DNA double helix.

Explanation

Explanation

Explanation

According to the law of universal gravitation:

F ∝ (m1 × m2) / r^2

Initially, F0 ∝ (m × m) / r^2

After doubling the mass and halving the distance:

F_new ∝ (2m × 2m) / (r/2)^2

= 16 × F0

Explanation

• A, D, E, and K are fat-soluble vitamins.
• Fat-soluble vitamins are absorbed by the body along with dietary fats.
• They are present in foods that contain fats.
• The body stores these vitamins in the liver and fat tissue when they are not in use. 
• Megadoses of fat-soluble vitamins can be toxic.

Explanation

CNG and Sui Gas have the same composition, primarily methane (CH₄).

Both are used as fuel for heating and vehicles.

It is used as a cleaner alternative to petrol and diesel in vehicles.

Explanation

Polio, or poliomyelitis, is a disabling and life-threatening disease caused by the poliovirus.

The virus spreads from person to person

and can infect a person's spinal cord, causing paralysis (can't move parts of the body).

***

The Polio vaccine was invented by___?

 Jonas Salk

Which country launched a polio vaccine drive after 1988 in April 2022?

 Israel

Explanation

Herbivore: Cow

Herbivores are animals that primarily feed on plants and plant-based materials.

Carnivore: Cat

Carnivores are animals that primarily feed on meat and animal tissue.

Omnivore: Dog

Omnivores are animals that feed on both plant and animal matter.

Explanation

A contagious disease spreads through direct or indirect contact with an infected person.

communicable diseases spread

Direct contact: Touching, sexual intercourse, or contact with bodily fluids from an infected person. 

Indirect contact:

Airborne: Breathing in germ-containing air after an infected person coughs or sneezes. 

Contaminated objects: Touching surfaces that have been contaminated by the pathogen. 

Contaminated food and water: Consuming food or water that contains disease-causing microorganisms. 

Vectors: Transmission by insects like mosquitoes or ticks. 

Examples of communicable diseases 

Bacterial: Tuberculosis, Salmonella, E. coli

Viral: Dengue, HIV, Ebola virus

Fungal: Ringworm, tinea

Parasitic: Malaria

Explanation

The first product from the oxidation of a primary alcohol is an aldehyde.

1. Initial oxidation:

The primary alcohol is oxidized by the removal of two hydrogen atoms, resulting in the formation of an aldehyde functional group (-CHO). 

2. Further oxidation:

The resulting aldehyde can then be further oxidized to a carboxylic acid functional group (-COOH) by the addition of a second oxygen atom.