Nucleic acid structure is made up of monomer unit called nucleotide. Each nucleotide is composed of a five-carbon sugar, a phosphate group and five types of nitrogenous bases.

The nitrogenous bases are categorized in two forms the purines (adenine and guanine ) and the pyrimidines (cytosine, thymine and uracil). The "purines" contain double rings in their structure due to which they appear larger in size than pyrimidines which are made up of single rings.

Thus, Option-B is the correct answer.

8 0

3 years ago

What is the single greatest threat to biodiversity?

Anni [7]

Answer:

Habitat loss

Explanation:

Habitat loss is the single greatest threat to biodiversity on Earth today and in fact it is the second largest threat to our existence on this planet next to Climate Change.

5 0

2 years ago

The evolution of multicellular organisms most likely occurred due to

goblinko [34]

Answer:

cells connecting to each other in colonies and communicating.

Explanation:

5 0

3 years ago

Determine the nature of the expression of the lacZYA genes, represented by L, and label each genotype as constitutive, inducible

VladimirAG [237]

Answer:

Explanation:

Symbol Representation

I- laci mutant cannot bind to the operator

Is laci mutant always bind to the operator

OC Operator mutant that prevent repressors binding

F’ the wild type operator, O+, and laci gene on a plasmid

L lacZYA genes

I+ O+ L+ Inducible

I+ OC L+ Constitutive

I+ OC L+, F’ Constitutive

I- O+ L+, F’ Inducible

Is O+ L+ no transcription

Is O+ L+, F’ no transcription

3 0

3 years ago