Question

Put the following four steps of eukaryotic gene expression in order, from beginning to end.

(1) Pre-mRNA is processed to make mRNA
(2) DNA is used as a template to make pre-mRNA
(3) Ribosomes translate the mRNA message to make proteins
(4) mRNA is transported to the cytoplasm

a. 1; 4; 3; 2
b. 4; 3; 1; 2
c. 4; 1; 3; 2
d. 2; 1; 4; 3
e. 1; 2; 4; 3

Answer 1

The correct order of eukaryotic gene expression steps is transcription (DNA to pre-mRNA), processing of pre-mRNA to mature mRNA, mRNA transport to the cytoplasm, and translation by ribosomes to make proteins. Hence, the answer is d. 2; 1; 4; 3.

Step-by-step explanation:

The Correct Order of Eukaryotic Gene Expression Steps

The process of eukaryotic gene expression involves multiple intricate steps to ensure that the genetic information encoded in DNA is accurately expressed as proteins. The correct order of the steps provided starts with transcription, where DNA is used as a template to make pre-mRNA (step 2). The next step is the processing of the pre-mRNA to make mature mRNA (step 1), which includes capping, polyadenylation, and splicing. Once processed, the mRNA is transported out of the nucleus to the cytoplasm (step 4). Finally, ribosomes translate the mRNA sequence into a polypeptide chain, which will fold to become a functional protein (step 3). Thus, the correct sequence is:

DNA is used as a template to make pre-mRNA (transcription)

Pre-mRNA is processed to make mRNA

mRNA is transported to the cytoplasm

Ribosomes translate the mRNA message to make proteins (translation)

Therefore, the correct answer to the student's question is option d. 2; 1; 4; 3.

Answer 2

The correct answer is option d.

Step-by-step explanation:

The process of gene expression in eukaryotes is more complex in comparison to prokaryotes. Unlike prokaryotes, in eukaryotes, the regulation of gene expression is done at various different levels. The gene expression in eukaryotes begins with the control of access to the DNA, which is also known as epigenetic regulation that takes place prior to the initiation of the transcription process.

The process of gene expression takes place in two main stages, that is transcription and translation. Transcription refers to the process of the synthesis of RNA, which is monitored by the association of promoters and enhancers. On the other hand, in translation, the mature RNA molecule is utilized as a template to align the series of amino acids to generate a polypeptide with a particular sequence of amino acids. The process takes place in the cytoplasm with the assistance of a complex known as the ribosome.

The following are the steps of eukaryotic gene expression from beginning to the end:

1. DNA is used as a template to give rise to a pre-mRNA.

2. pre-mRNA further gets processed to give rise to mRNA.

3. The transportation of mRNA takes place in the cytoplasm.

4. The translation of the mRNA sequence is done with the help of ribosomes to produce proteins.