Term
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Definition
| histone spools around which the DNA is coiled |
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Term
| In eukaryotic cells, histones |
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Definition
| serve as structures around which DNA is spooled for packaging. |
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Term
| The combined length of all of the DNA present in a single cell of your body is approximately |
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Definition
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Term
| Which of the following represents a type of housekeeping gene that would likely be expressed in a human pancreas cell? |
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Definition
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Term
| To control the translation of gene products in both prokaryotes and eukaryotes, regulatory proteins must interact with their appropriate regulatory DNA sequences to switch these genes on or off. |
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Definition
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Term
| Which of the following findings derived from recent analysis of the human genome does not illustrate our genetic relationships to more “primitive” organisms? |
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Definition
| Scientists have discovered that the use of DNA chips can help to identify genes expressed in cancerous cells. |
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Term
| From an evolutionary viewpoint, the information depicted in Figure 14.8 of your textbook about homeotic genes in mice and fruit flies suggests that |
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Definition
| homeotic genes are ancient and conserved among different organisms. |
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Term
| What is very abundant in human DNA? |
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Definition
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Term
Which of the following would you expect to find in a sample of DNA from one of your liver cells?
-transposens
-snear DNA
-DNA that codes for protiens
-DNA that codes RNA |
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Definition
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Term
| A sample of DNA from an unknown organism is analyzed and found to contain histone proteins, more than 2 billion base pairs, and large segments of noncoding DNA. From this information, one can conclude that the organism is |
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Definition
| some kind of eukaryotic organism. |
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Term
| What is the relationship between homeotic genes and gene cascades? |
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Definition
| Homeotic genes regulate gene cascades. |
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Term
The most common way gene expression is regulated in both prokaryotes and eukaryotes is through the
-control of mRNA translation
-Breakdown of protiens formed
-presentation of dna uvccilles
-Control of gene transcription |
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Definition
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Term
| The regulation of tryptophan synthesis in E. coli is an example of affecting gene expression through |
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Definition
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Term
| The homeotic genes of eukaryotes |
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Definition
| serve as “master switches” that help regulate organismal development. |
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Term
| Refer to Figure 14.4 in your textbook. The structure labeled “metaphase chromosome” at the top of this diagram would not be able to undergo successful gene transcription because |
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Definition
| the DNA is packed too tightly. |
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Term
| Which of the following does not play a role in the genetic regulation of tryptophan synthesis in the bacterium E. coli? |
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Definition
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Term
| Which of the following cell types found in your body would contain a different set of genes? |
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Definition
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Term
| A certain mutation in E. coli causes production of a faulty repressor protein used in the control of tryptophan synthesis. Refer to Figure 14.9 in your textbook and determine the most likely effect of this mutation. |
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Definition
| The cell will make new tryptophan regardless of tryptophan concentration. |
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Term
Consider the cyclopean organisms discussed at the beginning of this chapter. Which of the following is (are) plausible genetic explanations for the development of this condition?
-the org possessed a defective homeotic gene for eye development
-the orgs lacked the genes that cause eye formation. |
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Definition
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Term
| Which of the following statements regarding the control of gene expression and phenotype is false? |
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Definition
| Since homeotic genes are always expressed, they have little effect on phenotype. |
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