Question

Hans Ris Coined the term genophore for :
A) Genetic material of virus
B) Genetic material of fungus
C) Bacterial chromosome
D) Stalk supporting spores

Answer 1

Genophore refers to the chromosome that functions as inherited material. It is made up of , either DNA or RNA, nucleic acids; and has no histone protein.

Complete answer:
Option A : Genetic material of virus - Most viruses have either RNA or DNA as their genetic material. The nucleic acid may be single or double-stranded. The entire infectious virus particle is known as a “virion”.
This option is incorrect.

Option B: Genetic material of fungus - Fungi contain membrane-bound nuclei with chromosomes that contain DNA with noncoding regions. They have sterol-containing membranes, ribosomes of the 80S type and membrane-bound cytoplasmic organelles such as mitochondria.This option is incorrect.

Option C: Bacteria are basically prokaryotes. They are unicellular organisms and are devoid of the internal membrane-bound organelles. They have a primitive (incipient) nucleus called “nucleoid” or “genophore”, instead of a true nucleus.
The term “Genophore” was coined by Hans Ris, to differentiate bacterial chromosomes from the eukaryotic chromosomes.Thus, this is the correct option.

Option D: Stalk supporting spores - A sporophyte develops from an egg. In the majority of species the embryonic sporophyte elongates and one part becomes a foot. The opposite end develops into the spore-bearing capsule - and also the supporting stalk, or seta, in the species in which the mature capsule is stalked. This option is incorrect.

Thus, the correct option is (C) Bacterial chromosome.

Note: Ris had insisted to use the word "genophore" meaning "gene-holder", instead of "chromosome" to refer to the bacteria’s genetic behavior and correlated DNA. He gave significant differences between the genophoric DNA fibers in the prokaryotic nucleoids and the proteinaceous chromatin of eukaryotes (chromosomes).