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biology 1103 unit 2
Terms in this set (9)
Which of the following is the main difference between a primary and secondary source
Primary sources describe a single research study about a phenomenon or question, secondary sources present several research studies about that same phenomenon
Different cell types, for example a muscle or a blood cell in the same organism retain ___.
a complete set of their genes, and retain the ability to express those genes under certain circumstances into mRNA
Epigenetics describes the effect of on gene expression.
All of the following are true statements about gene expression
-In eukaryotic cells, gene expression can be controlled by numerous mechanisms beyond transcription factors or epigenetic tags.
-All of your cells contain the ADH2 gene, however, not all cells produce an ADH2 protein.
-Brain cells and liver cells in an individual are genetically identical.
-Portions of DNA that have few methyl tags will be loosely wound around histones and can be transcribed.
Studies examining epigenetic tags in twins have been useful in identifying variation in gene expression in humans. Which of the following patterns would you expect to be true based on epigenetics.
younger identical twins have more similar epigenetic tags on their DNA because they have a more common life experiences
If you were able to look very closely at a portion of DNA and find methylated histones (histones with methyl groups), you would:
be looking at a region of inactive DNA
The GR gene, which codes for a protein that results in anxious behavior in rats, can be inactivated by
Injecting a drug that results in tightly winding the section of DNA that contains the GR gene.
Queen bees are genetically identical to worker bees, however queen bees have a single gene silenced which impacts expression of numerous traits. The two bee types also differ in their diet as larvae, with individuals fed royal honey developing into queen bees. Based on your understanding of epigenetics, you might expect royal honey to be:
High in methyl compounds.
these following statements concerning the eukaryotic chromosome (found in animals, plants, fungi, and protists) are true
-Active transcription occurs in loosely wound chromatin.
-It is composed of DNA and protein.
-It consists of a single linear molecule of double-stranded DNA.
-the nucleosome is the most basic structural subunit.
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