What is RNA polymerase simple?

What is RNA polymerase simple?

A RNA polymerase (RNAP), or ribonucleic acid polymerase, is a multi subunit enzyme that catalyzes the process of transcription where an RNA polymer is synthesized from a DNA template.

What is the role of ribosomal RNA?

Ribosomal RNA (rRNA) associates with a set of proteins to form ribosomes. These complex structures, which physically move along an mRNA molecule, catalyze the assembly of amino acids into protein chains. They also bind tRNAs and various accessory molecules necessary for protein synthesis.

What are the 4 bases of RNA?

RNA consists of four nitrogenous bases: adenine, cytosine, uracil, and guanine. Uracil is a pyrimidine that is structurally similar to the thymine, another pyrimidine that is found in DNA. Like thymine, uracil can base-pair with adenine (Figure 2).

Are viruses filterable?

Bacteria reproduce by binary fission, and viruses reproduce by making new parts and assembling them. As a consequence of these observations, the word ‘filterable’ was dropped and these agents became simply ‘viruses’ as their distinction from bacteria and other infectious agents became clear.

Are viruses a theory?

The Virus World Theory is closely related to the RNA World Theory, which says life first evolved as small pieces of RNA that slowly developed into complex DNA-carrying organisms. The Virus World Theory agrees that life’s genetic material began as RNA.

Who proved filterable viruses?

Ivanoski

Can viruses pass through bacterial filters?

In the first instance, bacteria and viruses are trapped as they pass through the interlocking fibres of the filter material. They are further attracted to these fibres by the positive and negative electrostatic charges on the fibres.

Are viruses obligate parasites?

Viruses are small and relatively simple microbes that cannot grow outside of living cells, that is, they are obligate intracellular parasites (Figure 1).

What are filterable viruses?

Filters. A virus that is small enough to pass through a fine-pored filter, as of diatomite or porcelain. noun.

Why are viruses called filterable agents?

A filterable agent is essentially a germ, if you will, that is able to pass through a very small filter that would otherwise remove larger germs, including bacteria and parasites.In 1892, Russian biologist Dmitri Ivanovsky performed an experiment that led to the discovery of viruses.