Answer: All Viruses are obligate intracellular parasites that can only replicate inside a host cell.
Explanation:
Obligate intracellular parasites are parasite that cannot complete their life cycle or live outside a host cell . They become living and replicate in a host cell. Viruses are obligate intracellular parasites that reproduce and grow inside a host cell by using the intracellular resources in the host cell. Examples are human deficiency virus (HIV), AIDS virus, bacteriophage e.t.c.
Answer:
Gram-positive bacteria have a single cell wall anchored to the cell membrane by lipoteichoic acid.
Explanation:
According to Gram stain test, bacteria can be divided into two main groups which differs mostly in the structure of the cell wall"
- Gram-positive bacteria-thick cell wall which consist of peptidoglycan layer that is attached to cell membrane via teichoic acids (lipoteichoic acids). Because of their thick wall, after the staining, the violet dye retains, so Gram positive bacteria appear purple-coloured.
- Gram-negative bacteria-thin peptidoglycan layer with two cell membranes: inner and outer membrane (lipopolysaccharides). Usually, Gram negative bacteria contain porins. After the staining, the dye does not retain, so this type of bacteria appear red coloured.
Because it can analyze of what we are made of and who were our ancestors by studying our DNA
Microscopic organisms live at such extremes that, taking them into consideration, the thickness<span> of the </span>biosphere<span> is much greater. Culturable microbes have been found in the Earth's upper atmosphere as high as 41 km (25 mi).</span>