AP BIOLOGY

THE MOLECULAR BASIS OF INHERITANCE

DNA MAKES RNA MAKES PROTEIN

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Proteins are
A
built in the nucleus by DNA and transported to the ribosomes.
B
converted from nucleic acids to amino acids in the nucleolus.
C
produced in the lysosomes and transported out of the cell by vacuoles
D
transported to other parts of the cell by the endoplasmic reticulum from ribosomes.
Explanation: 

Detailed explanation-1: -A protein called coat protein II (COPII; green) forms vesicles that transport from the endoplasmic reticulum (ER) to the Golgi. A different protein called coat protein I (COPI; red) forms vesicles for transport in the other direction, from the Golgi to the ER. COPI also forms vesicles for intra-Golgi transport.

Detailed explanation-2: -Proteins can be translocated into the ER either during their synthesis on membrane-bound ribosomes (cotranslational translocation) or after their translation has been completed on free ribosomes in the cytosol (posttranslational translocation).

Detailed explanation-3: -From the endoplasmic reticulum, proteins are transported in vesicles to the Golgi apparatus, where they are further processed and sorted for transport to lysosomes, the plasma membrane, or secretion from the cell.

Detailed explanation-4: -A common pool of ribosomes is used to synthesize the proteins that stay in the cytosol and those that are transported into the ER.

Detailed explanation-5: -There are two types of endoplasmic reticulum, rough endoplasmic reticulum (RER) and smooth endoplasmic reticulum (SER). Rough endoplasmic reticulum is studded with ribosomes, which gives it a “rough” appearance. These ribosomes make proteins that are then transported from the ER in small sacs called transport vesicles.

There is 1 question to complete.