Answer:
The correct answer is-Subunits of ribosomes are assembled in the nucleolus and pass through the nuclear membrane via the nuclear pores.
Explanation:
In the nucleus, the nucleolus is present which is made up of RNA and protein. Nucleolus is the site where ribosomal subunits are produced and assembled with the help of rRNA and proteins.
Both the ribosomal subunits small and large are produced in the nucleolus and then they are then pass through the nuclear membrane with the help of nuclear pore present in the nuclear membrane.
Then some of these ribosome attaches to endoplasmic reticulum and some become free moving in cytoplasm. There these ribosomal subunits join to perform protein synthesis.
Therefore the correct answer is-Subunits of ribosomes are assembled in the nucleolus and pass through the nuclear membrane via the nuclear pores.
Answer:
Scientists studying the effects of warming on boreal forests which change the biome.
Explanation:
The main effect of warming on boreal forests is to change the biome because the plants and animals will not tolerate the increased temperature which occcurs due to climate change so the plants and animals disappeared from the boreal forests and change its biome. The animals migrated to other suitable environment where they continue its growth and increase their population. If climate projections are correct, the biome of this forest go to those places where the environment is suitable.
Answer:
D
Explanation:
The cell wall of bacteria is mainly made up of peptidoglycans and lipid molecules while that of viruses is made up of a protein coat called a capsid. The genetic material of bacteria is mainly DNA while that of viruses varies between DNA and RNA (for retroviruses) depending on the type of virus. Bacteria can replicate outside of host while viruses cannot.
D. Mechanically and chemically breaks down food for nutrient absorbtion
Answer:
Such transport mechanism is called<u> Antiport.</u>
Explanation:
The production of hydrochloric acid (HCl) by the parietal cells requires the activity of the
enzyme, carbonic anhydrase.In the presence of carbonic anhydrase CO₂ and H₂O are converted to HCO⁻ and H⁻.
The newly generated proton (H+
)s transported into the lumen of the stomach via the e H
₊₋K
+ATPase (called the proton pump)Concurrently, HCO₃
⁻ exits from the basal surface (blood side) of the parietal cell via the HCO₃⁻
₋ Cl antiporter.
The chloride ionneeded to form HCl, enters the parietal cell from the blood via the HCO₃⁻₋Cl⁻ antiporter and exits at the luminal side by the Cl⁻ channel. Once within the lumen of the stomach, cl⁻ combines with H⁺to form HCl.
The luminal K⁺ that is needed to maintain the activity of the proton pump(H⁺₋K⁻ATPase)enters the parietal cells from the stomach lumen by the H⁺₋K⁺ + ATPase and is then recycled back into the lumen of the stomach by the K⁺ channel.
