Explanation

The Balmer series of hydrogen spectra falls in the visible region. 

The Balmer series occurs when electrons transition from higher energy levels to the second energy level (n=2).

This series of transitions produces visible light. 

Explanation

The Paschen series of hydrogen lies in the infrared region. 

The Paschen series corresponds to transitions of electrons to the n=3 energy level in the hydrogen atom,
And all wavelengths in this series fall within the infrared portion of the electromagnetic spectrum. 

Lyman series: This series lies in the ultraviolet region. 

Balmer series: This series lies in the visible region. 

Brackett series: This series, along with the Paschen and Pfund series, lies in the infrared region. 

Explanation

 The Balmer series refers to a set of spectral lines in the visible region of the hydrogen spectrum.

Visible light ranges from approximately 380 nm to 780 nm, and the wavelengths of the Balmer series fall within this range. 

Explanation

Energy Level:

The final destination for the electron is the first principal energy level, known as the ground state (n=1). 

Source:

The electron must have been in a higher energy level, such as n=2, n=3, n=4, and so on, before making the transition to n=1. 

Spectrum Region:

The energy released during these transitions is high, resulting in spectral lines that fall within the ultraviolet (UV) region of the electromagnetic spectrum. 

Explanation

In RNA, the nitrogenous base uracil (U) replaces thymine (T)

This change means RNA contains the bases adenine (A), cytosine (C), guanine (G), and uracil (U),

DNA contains adenine (A), thymine (T), cytosine (C), and guanine (G). 

Explanation

RNA contains Uracil instead of Thymine, which is found in DNA.

The four bases in RNA are Adenine (A), Uracil (U), Guanine (G), and Cytosine (C).

Explanation

Thymine is the nitrogenous base which is not present in RNA

Thymine is one of the four nucleobases found in DNA (along with adenine, guanine, and cytosine)

Whereas RNA contains uracil (U) instead of thymine.

RNA uses uracil as a complementary base to adenine during transcription,

while DNA uses thymine as a complementary base to adenine during replication.

Explanation

Purines: Adenine and Guanine are classified as purine bases because they have a double-ring structure.

Pyrimidines: Cytosine and Thymine are classified as pyrimidines, which have a single-ring structure. 

In DNA, the base pairs are always formed between a purine and a pyrimidine. 

Adenine pairs with Thymine, and Guanine pairs with Cytosine. 

Explanation

The base pairing rules in DNA (that Adenine pairs with Thymine, and Guanine pairs with Cytosine)

They were discovered by the Austrian biochemist Erwin Chargaff.

These observations, known as Chargaff's rules, were critical to Watson and Crick in determining the structure of the DNA double helix. 

Explanation

Guanine (G) pairs with Cytosine (C) . 

Adenine (A) pairs with Thymine (T) .

This A-T and G-C pairing is called complementary base pairing. 

Three hydrogen bonds connect guanine and cytosine. 

Two hydrogen bonds connect adenine and thymine. 

The pairing of a purine (like G) with a pyrimidine (like C) results in a uniform diameter of the DNA double helix.