What is true about genetic material of a prokaryotic cell ? (A) Lacks histones (B) Not enceloped by nuclear membrane (C) Composed of a single circular DNA molecule (D) All of these
Answer
Answer: D In prokaryotes, the genetic material consists ofd single circular DNA molecule lying entanglend in nucleoid. It is not bounded by a definite nuclear membrane. Histones are water-solble proteins rich in arginine and lysine that help in DNA packaging in chromosomes. Prokaryotic cells lack histone proteins.
Plastids differ from mitochondria on the basis of which of the following features ? (A) Presence of two layers of membrane (B) Presence of ribosome (C) Presence of thylakodis (D) Presence of DNA
Select the correct pair out of the following (A) Hypostomatic leaf-dicots (B) epistomatic leaf-monocots (C) amphistomatic leaf-free-floating hydrophytes (D) presence of sunken stomata in leaf-submerged hydrophytes
Carrier ions like \({N}{a}^{{+}}\) faciltate the absorption of substance like (A) amino acids, and glucose (B) glucose and fatty acids (C) fatty acids and glycerol (D) fructose and some amino acids.
Persistet nucellus is called as______________and is found in __________. (A) perispern, black pepper (B) perisperm, groundnut (C) endosperm, black pepper (D) endosperm,groundnut
The type of muscle present in our (A) heart is involuntary and unstirated smooth (B) intestine is striated and involuntary (C) thigh is striated and voluntary (D) upper arm is smooth muscle and fusiform in
Which one of the following microorganisms forms symbiotic assocation with plants and helps them in their nutrition? (A) Glomus (B) Azotobacter (C) Klebsiella (D) Azospirillum