Cell Biology and Structure

Ripoptosome represents a death-inducing signalling platform that assembles in response to genotoxic stress.

Genes are segments of DNA located on chromosomes within the nucleus of eukaryotic cells. Chromosomes are thread-like structures made of DNA and proteins that carry genetic information in organized units called genes.

Amoeba ingests food through a process called phagocytosis, where it extends pseudopodia (temporary cytoplasmic projections or 'false feet') around food particles to engulf and trap them in a food vacuole.

Phagocytosis comes from Greek roots meaning 'cell eating.' It is the process by which a cell engulfs solid particles like food or bacteria. 'Cell feeding' accurately describes this process of taking in nutrients by surrounding them with the cell membrane.

Amoeba obtains food through phagocytosis, where it extends pseudopodia (false feet) to surround and engulf food particles. Photosynthesis is for plants, photolysis refers to breaking chemical bonds with light.

The food vacuole in amoeba functions as a temporary stomach because it contains enzymes that digest the engulfed food. It is an intracellular compartment where digestion occurs before nutrients are absorbed into the cytoplasm.

In bacteria, the respiratory organelle is mesosome.

All three kingdoms mentioned have cell walls. Monera (bacteria) have peptidoglycan cell walls, fungi have chitin cell walls, and plantae have cellulose cell walls. Therefore, all of them possess organisms with cell walls.

Bacterial DNA lacks histones, which are proteins that help package DNA in eukaryotes. Bacteria do contain nucleic acids (DNA/RNA) and polyamines, but histones are absent in their nuclear material.

Fungi store their food reserves as glycogen, similar to animals. Plants store starch, and oils are found in various organisms. Polyamines are not a food reserve but nitrogen compounds involved in cellular processes.

Prokaryotes possess cell walls, ribosomes, and cell membranes - all three structures listed are present in bacteria. The question likely refers to membrane-bound organelles like nucleus, mitochondria, or ER which are absent, but based on given options, 'None of the above' is correct.

All three options are eukaryotes. Plants have true nuclei and organelles. Kingdom Protista consists of eukaryotic organisms. Yeast is a fungus, which is eukaryotic. Therefore, all are eukaryotes.

Yeasts are eukaryotic microorganisms classified within the Kingdom Fungi. They reproduce asexually by budding or fission and obtain nutrients through absorption. Unlike bacteria which are prokaryotic, viruses which are non-living, and protists which are a separate kingdom of mostly unicellular eukaryotes, yeasts share all defining fungal characteristics including cell walls made of chitin and inability to perform photosynthesis.

The nucleoid is an irregularly shaped region within the cell of a prokaryote that contains all or most of the genetic material, called genophore.