Answer:
Type Il cell.
Explanation:
Surfactant may be defined as the chemical that decreases the surface tension between the lungs. Pulmonary surfactant is the thin layer of fluid that increases the efficiency of gas exchange.
Type II alveolar cells of the lungs produces the surfactant. Lipida and proteins are the major constituent of the surfactant produced in the lungs. The surfactatnt is important for maintaining the integrity of alveoli.
Thus, the correct answer is option (e).
Answer:
Answer :- Step 1 Receptors (sense organs, muscles, glands, etc.) receive stimuli from the environment or from inside your body.
Step 2 The central nervous system processes information received from the peripheral nervous system.
Step 3 The central nervous system sends out the processed information to the peripheral nervous system.
Step 4 The peripheral nervous system sends a message to the body part that needs to respond so you can react appropriately to the stimulus.
Explanation:-
There are two different parts of the nervous sytem-the peripheral nervous system (PNS) and the central nervous sytem (CNS).
The CNS consists of the brain and the spinal cord .
The PNS consists of all the nerves that lie outside the CNS.
The main function of the PNS is to gather information from the sensory receptors located in our body and convey this information to the central nervous system.
The CNS collects this information from the PNS and then interprets it. The interpreted information is then relayed back to the body parts via the PNS to perform the appropriate action
Explanation:
Answer:
The stem cells are not specialized or differentiated; instead, differentiated and specialized cells are formed from the stem cells.
so its most likely false
hope this helps
The correct answers are:
- Methylation of histone tails in chromatin can promote condensation of the chromatin.
- DNA is not transcribed when chromatin is packaged tightly in a condensed form.
- Acetylation of histone tails is a reversible process.
- Some forms of chromatin modification can be passed on to future generations of cells.
- Acetylation of histone tails in chromatin allows access to DNA for transcription.
Histone modifications are post-translational modifications of histone protein that can affect gene expression by altering chromatin structure or recruiting histone modifiers.The most common modifications are methylation, phosphorylation, acetylation and ubiquitylation. All of them affect the binding affinity between histones and DNA and thus loosening (gene activation) or tightening (gene repression) the condensed DNA.
Histone methylation is a transfer of methyl group by histone methyltransferases to lysine or arginine amino acid of protein. Effect of methylation depends on the type of protein that is modified. Demethylation is the reverse process.
Histone acetylation is the process of adding of an acetyl group(by histone acetyltransferases) to histone proteins and it can also activate or inhibit the gene expression. Deacetilation is reverse process.