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Solution of Q 40: D is the correct answer.
Heterochromatin is a major contributor to varation in gene density in eukaryotes. It is darkly stained, densely packed and scattered throughout the nucleus. It has two types i.e constitutive and facultative. Facultative heterochromatin contains repetitive sequence called as satellite DNA.
Transposons are genetic elements or jumping genes that contribute to cell size and are used in biotechnology to introduce foreign dna into genome. It also creates mutations in the dna.
Restriction sites are recognition sites on a dna molecules containing specific base pairs in length. Restriction enzymes bind to it.
40) Which of the following is a major contributor to variation in gene density in eukaryotes?...
Q1)Which of the following is not involved in control of gene expression in eukaryotes? A. Change to DNA sequence. B. Alternative splicing. C. Export of mRNA from the nucleus. D. Transcriptional repression. E. Destruction of mRNA Q2) Trans-acting regulators of gene expression include? A. promoters. B. histone deacetylases C. introns D. silencers E. the TATA box. Q3) Gene regulation in eukaryotes often involves which of the following, which are not also used by prokaryotes? A.RNA polymerase B.Transcription factors C.Histone modification...
Which of the following is a major difference between prokaryotes and eukaryotes? a. Eukaryotes have linear chromosomal DNA, prokaryotes do not b. Eukaryotes live in extreme environments, prokaryotes do not c. Prokaryotes live in extreme environments, eukaryotes do not d. Only prokaryotes have histones, eukaryotes do no
QUESTION 52 Which of the following has/have repetitive DNA sequences in heterochromatin state? (Select all that apply.) A. mitochondria B. telomere C. centromere D. chloroplast
Which of the following is not true regarding regulation of gene expression in eukaryotes? In eukaryotic cells, transcriptional activators often work by recruiting the transcriptional macinery to gene promoters DNA methylation is an example of an epigenetic mark that can be inherited Acetylation of histones can result in a more open chromatin structure to allow transcription to occur Different genes can be turned off or on between different organs or stages of development Transcription factor DNA sequences are bound by...
Which of the following is different between prokaryotes and eukaryotes? a Prokaryotes are polycistronic and eukaryotes are monocistronic b Prokaryotes have more complex controls over gene expression than eukaryotes c mRNA only exists in eukaryotes. d DNA does exist in prokaryotes. 2. Do humans contain an 80s ribosome? True or False?
Transcriptional control of gene regulation is common in both prokaryotes and eukaryotes. Which of the following is not true? Both prokaryotes and eukaryotes: A. exhibit both positive and negative control. B. have repressors that impact expression. C. often requires interactions with DNA that is not proximal to structural genes. D. have genes that are closely related in function located proximally on a chromosome
Which of the following is NOT a mechanism for gene regulation? a. Phase variation in DNA. b. Repressor binding to a promoter. c. Binding of a sRNA to a ribosome-binding site. d. None of the above.
step bt step please The genomic region for the wizarding gene has been identified and characterized using the EcoRI enzyme. Four variable sequences have been mapped, labeled A-D, with the sizes of the fragments given in kilobases (kb). RFLP analysis has been performed on 4 individuals and the gel is shown below. Which restriction site or sites are missing, leading to an RFLP in Ron's sequence? 3.3 1.1 i 2.6 Rupert Leona Ron Hermione a. site B b.site 6. sites...
Which of the following is NOT a major contributor to the US trade deficit over recent decades? A 1: Intellectual property imports A 2: Energy imports A 3: Outsourcing of commodity manufacturing A 4: International competition
which of the following describes a feature found in bacterial expression vectors but not in cloning vectors? A. origin of replication B. cleavage sites for restriction nucleases C. promoter DNA sequences D. a polyadenylation signal