The terminal cisternae releases calcium ion
The terminal cisternae act as calcium storage sites. The calcium ions stored in the terminal cisternae are essential in muscle contraction. The calcium release unit of muscle consists of terminal cisternae of the sarcoplasmic reticulum and it is adjacent transverse or T- tubule that is the invaginated part of the surface membrane.
B, burrowing action of earthworm
Answer:
Addition of a(n) methyl group to certain lysine residues of a histone protein makes the region of chromatin transcriptionally silent; addition of a(n) acetyl group to certain lysine residues makes the region of chromatin transcriptionally active.
Explanation:
The changes suffered in the expression and activity of the genes are studied by the Epigenetics.
Answer:
The odd is zero.
Explanation:
Assuming the Huntington disease allele is represent by b. Nomal allele will be B which is the alternate form.
The genotype of the 25 years old woman will be Bb, since she heterozygote.
The genotype of the husband will be BB, since he's free from the trait.
Crossing both genotypes:
Bb x BB = BB, BB, Bb and Bb.
The genotypes of the offspring will be either BB or Bb. They either free from the trait or heterozygote.
<em>Hence, the odds that the couple will have a child with the disorder is 0. They can only produce heterozygotes or totally normal children.</em>
