When temperature inversion occurs, cold air underlies warmer air at higher altitudes.
Answer:
D
Explanation:
Nucleus contains all the genetic material that codes for different proteins that control the cell's actions. It's surrounded by a nuclear membrane.
However,
- Mitochondria is used for energy production and isn't surrounded by a nuclear membrane. It's in fact surrounded by 2 membranes.
- Pinocytic vesicles usually contain endocytosed material from outside that has nothing to do with the cell's control.
- Nucleolus is inside the nucleus and is used to make rRNA needed for ribosomes production. A nucleolus is not surrounded by any membrane.
Microbes cause tissue damage to their host cell or body in different ways.
1. Microbes can release toxins that can damage the cells and tissues of the host.
2. Microbes can release enzymes that can breakdown the cells and tissues of the host.
3. Microbes can activate certain responses in the host that can make the latter destroy its own tissues. Usually, the immune response of the host cell is disturbed, making the immune system attack the cells of the host itself.
Only eukaryotic cells have a nucleus so its dna is in the nucleus but in prokaryotic cells the dna is in the cytoplasm
Answer:
The correct answer is: RNA dependent RNA polymerase, also called, RNA replicase.
Explanation:
- RNA dependent RNA polymerase or RNA replicase is an enzyme that is capable of replicating RNA. This means the enzyme is capable of utilising RNA (Ribonucleic Acid) as a template strand to synthesise a new RNA molecule as the daughter strand.
- This enzyme is encoded only in the genome of those viruses that use RNA as their genetic material and such viruses are called RNA viruses.
- This enzyme is absent in the host cells that the virus infect.
- These viruses hijack the host cell machinery to translate their RNA genome and synthesise the RNA replicase protein, which further helps in replicating their RNA genome.