Which of the following statements is not correct about epigenetics or epigenetic
ID: 227151 • Letter: W
Question
Which of the following statements is not correct about epigenetics or epigenetic mechanisms? A. Epigenetic mechanisms are heritable changes in gene expression and function that include changes in DNA sequence B. Epigenetic changes are most prominent during early development C. Epigenetic changes could pass from one generation to the next D. Epigenetic changes include DNA methylation, histone modifications and non-coding RNAs A nucleosome consists of A. an RNA molecule. B. a stretch of DNA and histones C. two or more closely related genes. D. a stretch of DNA. Sexual reproduction is important to the survival of a species in a changing environment because A. sexual reproduction produces genetically identical individuals B. sexual reproduction produces genetically variable individuals C. sexual reproduction requires only one individual to survive and produce germ cells D. sexual reproduction requires less overall energy expenditure than asexual reproduction If a mutation causes the "T" base in the base sequence 5'-AGTCCG-3' to be read as a "G" base, DNA replication of the mutated sequence will read: A. 3'-TCCGGC-5' B. 3'-AGGCCG-5' C, 3'-UCCGGC-5' D. 3'-AGTCCG-5' The human chromosomes that DO NOT determine whether an individual is male or female are A. Called sex chromosomes B. X and Y chromosomes C. Autosomes D. None of the above is correct which of the following statements is correct about epigenetic mechanisms? A. They occur early in life and could occur during adulthood B. Methylation is an epigenetic mechanism that is associated with methylation of cytosine that is situated next to a guanine C. Modifications of histones can turn ON or OFF gene expression depending on the type of modifications that occur along the histone tail D. All of the above are correctExplanation / Answer
15. B) epigenetic changes are most prominent during early development.
Epigenetics refer to changes in a chromosome that affect gene activity and expression, produced by changes like DNA methylation and histone modification. These are any heritable phenotypic changes that isn't derived from a modification of the genome. Being heritable , they can be passed on .
16. B) A set of DNA and histones
Nucleoside is the basic unit of DNA packaging, in eukaryotes, that includes a segment of DNA that is wrapped or wound in sequence around 8 histone proteins.
17. B) Genetically variable individuals
With the exchange of chromosomes, there is exchange of genetic material between the two germ cells, thus increasing genetic variability.
18. A) 3' TCCGGC 5'
A---> T and G ----> C
19. C) Autosomes
The chromosomes that determine sex of an individual are X and Y and are called sex chromosomes and the other are called autosomes.
20. D) all of the above
Epigenetics refer to changes in a chromosome that affect gene activity and expression, produced by changes like DNA methylation and histone modification. These are any heritable phenotypic changes that isn't derived from a modification of the genome. Being heritable , they can be passed on .
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