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15. 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 16. 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. 17. 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 18. 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' 19. 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 20. 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 correct

15. 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
16. 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.
17. 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
18. 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'
19. 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
20. 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 correct

Added by Lorenzo C.

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