Biology Mixed Test - 1

This option is correct, DNA was first identified by Friedrich Meischer in 1869. He named it nuclein.

This option is correct, DNA is wrapped around the histone octamer to form a nucleosome. A typical nucleosome contains 200 bp of DNA helix.

This option is correct, in eukaryotes the organisation is much more complex, there is a set of positively charged, basic proteins called histones.

This option is correct, guanine is a purine, not a pyrimidine.

This option is correct, transcription is the process of making RNA from DNA.

This option is correct, translation is the process in which the messenger RNA is decoded by the ribosome to produce a specific amino acid chain, or polypeptide.

Prokaryotes have circular DNA, but lack in proteins called histones.

Convergent evolution occurs in unrelated lineages. So, analogous structures are traits arising from this kind of evolution.

Exon is the protein coding region of gene and thus, responsible for protein synthesis.

DNA replication occurs several times without cell division, thereby increasing cell volume in case of polytene chromosomes.

Dionaea is a carnivorous plant.

Lead is not an essential mineral element for plants. 

Nickel is a micronutrient. Plants need micronutrients in concentrations of less than 100 milligrams per kilogram of their dry matter.

Snapdragons and four-o-clock plants produce F1heterozygotes in which blending of dominant and recessive traits take place and this is termed as incomplete dominance.The dominant allele does not mask the phenotypic expression of recessive allele completely.

'Khaira' disease of rice is caused due to zinc deficiency.

This option is correct, DNA as an acidic substance present in nucleus was first identifeid by Friedrich Meischer in 1869.

Dodder is a parasitic plant. 

This option is correct. Lysine is an amino acid.