Explanation

Bacteria, specifically Escherichia coli (E. coli),

They are commonly used in genetic engineering to produce large quantities of human insulin

. The insulin gene is inserted into the bacteria's DNA, allowing them to produce the insulin protein when replicated

Explanation

The hypothalamus is the primary control center for body temperature regulation,

And it works in conjunction with blood vessels near the skin surface (which can adjust blood flow to control heat loss)

And skeletal muscles (which can generate heat through shivering). 

Explanation

One parent (at least) must be heterozygous.

Blood group genetics:

Blood type is determined by three genes, A, B, and O. A and B are dominant over O, meaning if someone inherits even one A or B gene, they will have blood type A or B, respectively.

If they inherit two O genes, they will have blood type O. 

Scenario:

If one brother has blood type A (could be AA or AO genotype) and the other has blood type O (OO genotype), they must have inherited an O gene from each parent.

This means that at least one parent must be heterozygous (AO) for the A gene to produce an A blood type child and an O blood type child. 

Explanation

Light intensity refers to the amount of light energy reaching a plant surface per unit time.

This is a crucial factor for photosynthesis as it directly determines how much energy is available to drive the process

Higher light intensity leads to a higher rate of photosynthesis until the plant reaches its maximum capacity. 

Explanation

The organelle that is not present in animal cells is the Plastid. 

Plastids, including chloroplasts, are organelles specific to plant cells and are not found in animal cells. 

Endoplasmic Reticulum:

Present in both animal and plant cells. 

Ribosome:

Present in all cells, as they are the site of protein synthesis. 

Mitochondria:

Present in most animal cells, responsible for generating energy. 

Explanation

Stoichiometry calculations can only be carried out when all of the above are true:

Irreversible reactions:

Stoichiometry calculations are based on the assumption that the reaction proceeds to completion, meaning all reactants are used up to form products. 

No side reactions:

Side reactions would introduce additional products and complicate the calculations. 

At least one reactant consumed completely:

Stoichiometry calculations determine the amount of products formed based on the amount of a limiting reactant. 

Explanation

All gases will start effusing at the same time, but the rate of effusion depends on their molar mass (Graham’s Law).  

Lighter gases like H₂ effuse faster than heavier ones like Cl₂.

Explanation

 Energy = Power × Time = 40 W × 3600 s = 144000 J

Explanation

Explanation

The magnitude of a unit vector is always 1.

If this question refers to a general vector,

The magnitude is calculated based on its components,

But if it's asking conceptually or generally, then 1 is the correct choice.