Flag this Question Question 12 1 pts Polytene chromosomes ar

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Question 12 1 pts

Polytene chromosomes arise from multiple rounds of DNA replication without cell division.

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Question 13 1 pts

Epigenetic changes involve

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Question 14 1 pts

Unusual loop-shaped structures of DNA sometimes from at the ends of chromosomes.

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Question 15 1 pts

Long interspersed elements (LINES) are rare in the human genome.

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Question 16 1 pts

The DNA of bacterial genomes is dispersed nearly evenly throughout the cytoplasm.

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Question 17 1 pts

The combination of eukaryotic DNA and proteins is termed:

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Question 18 1 pts

Centromeres and telomeres are virtually always found in heterochromatic regions of chromosomes (parts of chromosomes organized in heterochromatin).

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Question 19 1 pts

Changes in the sensitivity of DNA at specific loci (positions along chromosomes) to digestion by DNAse I can be used to monitor the relative state of chromatin condensation.

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Question 20 1 pts

Sensitivity of a particular DNA sequence to digestion by DNase I often changes with changing patterns of gene expression.

Solution

Q12. True

Cells undergo repeated rounds of DNA replication without cell division, to increase cell volume, forming a giant polytene chromosome

Q13.changes in chromatin structure

Epigenetic changes do not change DNA sequences, they cause acetylation/deacetylation of histone proteins and cause change in chromatin structure.

Q14. True

Telomeres form large loop structures called telomere loops

Q15. False

They make up around 20% of the human genome