Answer:
The correct answer is b.
Explanation:
The signal peptide acts as an initiator of the transfer. Proteins whose first destination is the endoplasmic reticulum have a signal peptide at their amino terminal end that includes a sequence composed of 5 to 10 hydrophobic amino acids, which is recognized by a receptor of this organelle that opens a channel in its membrane allowing such proteins to can get through it. Most of these proteins will then continue their course towards the Golgi apparatus, but those that also have a certain sequence of four amino acids (-Lys-Asp-Glu-Leu-COOH) at their other end (carboxyl terminal) are retained in the endoplasmic reticulum as proteins of this organelle. The transfer stop peptide anchors the protein on the membrane after the ER signal peptide (transfer initiator) is released from the translocator and removed.
Answer:
The similarities and differences between DNA and RNA are given as follows:
Explanation:
Similarities:
Both are made up of nucleotides
Nucleotides are made up of nitrogenous bases, a pentose sugar, and the phosphate backbone.
Both DNA and RNA have four nitrogenous bases each - two purines two pyrimidines
Purine binds with pyrimidines
Differences
DNA uses the nitrogenous bases adenine, cytosine, thymine, and guanine whereas RNA uses adenine, cytosine, uracil, and guanine. Uracil lacks a methyl group on its ring
RNA contains the sugar ribose that has an extra -OH while DNA contains the deoxyribose sugar that has H at the 2 carbon.
DNA is double-stranded while RNA is a single-stranded
Under alkaline conditions, DNA is stable while RNA is not stable.
plays the role in skeletal muscle movement