Question

70S type of ribosomes are present in all of the following, except
OPTIONS
A) Mitochondria of nerve cell
B) Cytoplasm of Anabaena
C) Chloroplast of leaf cell
D) Nucleus of human cheek cell​

Answer 1

70S type of ribosomes are present in all (D) Nucleus of human cheek cell​

Explanation:

Mitochondria of nerve cell:

• Mitochondria are highly dynamic organelles that divide, fuse, and migrate about in axons and dendrites for a variety of reasons.
• The regulation of $Ca2+$ and redox signalling, developmental and synaptic plasticity, and cell survival and death are all important activities of mitochondria in neurons.

Cytoplasm of Anabaena:

• Anabaena is a nitrogen-fixing blue-green algae genus with beadlike or barrel-like cells with intermittent larger spores (heterocysts) that can be found as plankton in shallow water and on moist soil.
• Solitary and colonial forms exist, with the latter resembling Nostoc, a closely related genus.

Chloroplast of leaf cell:

• Chloroplasts are found in the cells of all green plant and algal tissues. Chloroplasts are concentrated in the parenchyma cells of the leaf mesophyll in plants.

Nucleus of human cheek cell​:

• The organelles of the cheek cell are membranous, and the nucleus is surrounded by membrane. The nucleus of animal cheek cells is placed in the cytoplasm's centre, is denser and granular, and takes up more area.
• In human cheek cells, these structures, also known as cell organelles, are plainly visible.