Which of the following statements best describes gene expression in humans? A. A

Question

Which of the following statements best describes gene expression in humans? A. All human eels have the same genes. B. All human cells express the same genes. C. Human cells have the same genes, but only a subset is expressed in a specific tissue. D. Once genes are turned on in human cells, they cannot be turned off. The following terms are all involved in the same process except for: A. Promoter B. Enhancer C. Terminator D. Start codon E. RNA polymerase Gene expression is regulated in both prokaryotic and eukaryotic cells. One mechanism of regulation is through the half-life of messenger RNA. Based on what we have learned about gene expression, an mRNA molecule that has a long life (lasting for a long time) will lead to A. More polypeptide and higher level of gene expression. B. More polypeptide and lower level of gene expression. C. Less polypeptide and lower level of gene expression. D. Less polypeptide and higher level of gene expression. E. No effect on gene expression. The following figure shows the DNA-RNA duplex of a gene. The solid line is ONA and the dashed line is RNA. Which of the following correctly describes this gene? A. This is a prokaryotic gene. B. This is a prokaryotic or eukaryotic gene. C. This is a eukaryotic gene with three exons. D. This is a eukaryotic gene with three introns. The DNA strand that forms duplex with its mRNA is the template strand. Which of the following correctly describes the relationship between a template strand and its primary mRNA product? A. Having the same sequences and anti-parallel. B. Having the same sequences and parallel. C. Complementary and anti-parallel. D. Complementary and parallel.

Explanation / Answer

Answer:

1). C. Human cells have the same genes, but only a subset is expressed in a specific tissue

2). C. Terminator

Exept the terminator, all options helps in progression of transcription.

3. D. More polypeptide and higher level of gene expression

4. D. This is a eukaryotic gene with three introns

Introns are spliced out, the

5. C. Complementay and anti-parallele

Template DNA runs from 3’---5’ whereas mRNA runs from 5’—3’, so anti-parallele.

Template DNA consists of base, Adenine, the complementary base of the mRNA is Uracil, so it is complementary.

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