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.
The answer is hypnotic do u have answer choices?
Answer:
Yes.
Explanation:
Cell division & differentiation also happens in animals and plants, and is not limited to just human beings.
Answer: Option A and B.
Archaea and bacteria are prokaryote and reproduce by binary fission.
Explanation:
Archaea are grouped of single celled organisms that have no cell nuclei. They are prokaryotes and reproduce by binary fission. They were formally grouped as bacteria with the name archaeabacteria but the classification is outmolded. They are now renamed as archaea bacteria as they are closely related to eukaryotes.
Bacteria also are single celled, microscopic organisms. They are prokaryotes and they reproduce by binary fission. They have are number of shapes ranging from spheres to rods.
a) volume in cm³ = 20 × 42 × 42 = 35280 cm³
b) volume in m³ = 0.2 × 0.42 × 0.42 = 0.03528 m³
c) volume in ml³ = 200 × 420 × 420 = 35280000 ml³
d) volume in litres = 0.02 × 0.042 × 0.042 = 0.00003528 l³
e) Density = Mass / Volume
Mass = Volume × density
= 0.00003528 × 1
= 0.00003528 × 1000
= 0.03528 grams
f) Mass in kilo gram = 0.00003528 kg
