Given below are two statements:
Statement I: A unit formed by the attachment of a base to 1' position of sugar is known as nucleoside.Statement II: When nucleoside is linked to phosphorous acid at 5 -position of sugar moiety, we get neucleotide. In the light of the above statements, choose the correct answer from the options given below:
Given below are two statements:
Both Statement I and Statement II are false
Statement I 1s true but Statement II is false
Statement I is false but Statement II is true
Both Statement I and Statement II are true
The Correct Option is B
Solution and Explanation
Statement I: A unit formed by the attachment of a base to the 1' position of sugar is known as a nucleoside. This statement is true. A nucleoside is indeed formed by the attachment of a nitrogenous base (e.g., adenine, guanine, cytosine, thymine, or uracil) to the 1' carbon of a sugar molecule (ribose or deoxyribose).
Statement II: When a nucleoside is linked to phosphoric acid at the 5'-position of the sugar moiety, we get a nucleotide. This statement is false. A nucleotide is formed when a nucleoside (base attached to sugar) is linked to a phosphoric acid (phosphate) molecule at the 5' carbon of the sugar moiety. However, the statement erroneously mentions "phosphorous acid" instead of phosphoric acid, which is incorrect.
Therefore, The correct option is (B): Statement I 1s true but Statement II is false.
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Concepts Used:
Biomolecules - Hormones
Hormones are defined as important chemicals that act as messengers of the body. These are the chemicals that are secreted by special glands, known as endocrine glands and these distributed throughout the body. It helps in controlling of physiological functions. Moreover, they are important while maintaining homeostasis in the body. The entire endocrine system is a network of glands. Hormones are almost same as the nervous system. Functioning of various body functions it plays an important role. The only difference between the nervous system and hormones that nervous system uses nerve impulses and neurotransmitters for communication, while the endocrine system uses chemical messengers named hormones.
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- Peptide Hormones: Peptide hormones include amino acids that are soluble in water. Insulin is a vital peptide hormone that is produced by the pancreas.
- Steroid Hormones: Unlike peptide hormones, steroid hormones are fat-soluble and can easily pass through a cell membrane with ease. Sex hormones like testosterone, estrogen, etc. are some of the kinds of steroid hormones.