Enzymes, vitamins and hormones can be classified into a single category of biological chemicals, because all of these

• enhance oxidative metabolism

• are conjugated proteins

• are exclusively synthesized in the body of a living organism as at present

• help in regulating metabolism

In DNA, which is absent

• Adenine

• Thymine

• Guanine

• Uracil

Which is called soluble RNA

• r-RNA

• t-RNA

• m-RNA

• hn-RNA

Micro-nutrients are

• less important in nutrition than macronutrients

• as important in nutrition as macro-nutrients

• may be omitted from culture media without any detrimental effect on the plant

• called micro because they play only minor role in nutrition

Carrier of fluorosis is

• CO₂

• chlorine

• nitrogen

• water

Non-genetic RNA is of

• two types

• three types

• only one type

• none of these

67.

A nucleotide is a molecule consisting of a

•  hexose sugar, phosphorus and albumen

• phosphorus, iron and calcium

• phosphate, 5-carbon sugar and nitrogen base

• RNA and glucose

Non-protein part of enzyme is known as

• holoenzyme

• apoenzyme

• prothetic group

• none of these

Carbohydrates, the most abundant biomolecules on earth, are produced by:

• all bacteria, fungi and algae

• fungi, algae and green plant cells

• some bacteria, algae and green plant cells

• viruses, fungi and bacteria

Which one is antioxidant vitamin?

• Vitamin- D

• Vitamin- E

• Vitamin- B

• Vitamin- K