BIOL 3110 Lecture Notes - Interphase, Cell Nucleus, Reading Frame

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maroonskunk776

7 Oct 2012

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Exon duplication and shuffling; the presence of exons has always been a part of the genes early on in life. The existence of introns allow for the exons to be shuffled and reorganized. Immunoglobulin proteins are made of 2 protein chains, the light and heavy chains . The variable region is used for attaching onto the antigen and the constant is used for binding onto the pathways to remove it. There are certain proteins or receptors that share exons with out genes, such as the ldl receptor and egf precursor. As proteins increases in length the genes have a greater number of exons to code for them, not larger exons. Site in protein (represented by the intron/exon boundaries of the gene) is located at the surface of the protein. All genetic information from bacteria or eukaryotes is highly condensed to fit all the information of the genome into the nucleus; the dna is also usually complexed with rna and proteins.

Related Questions

While comparing two different protein-sequencing methods requiring minute amounts of protein, you established the amino acid sequence of the entire light chain of a purified immunoglobulin. From this sequence you will be able to determine [complete the sentence and assess the resulting statements (1-6) as either factually correct (= true) or incorrect (= false)]:

1. the isotype of the immunoglobulin.

2. whether the B cell that produced this antibody received T-cell help.

3. the specific variable gene fragment used to produce this chain.

4. the antigen specificity of the immunoglobulin.

5. the approximated strength of the immunoglobulinâs binding to different Fc receptors.

6. the molecular weight of the post-translationally unmodified light chain.

fuchsiaelk366

Exotoxins are ______.

Select one:

a. antiphagocytic factors

b. lipopolysaccharides

c. proteins secreted by living bacterial cells

d. secretions that always target nervous tissue

e. only released after a cell is damaged or lysed

B cell receptors differ from T cell receptors in that

Select one:

a. B cell receptors are comprised of four polypeptides, whereas T cell receptors have only two polypeptides in their quaternary structure.

b. B cell receptors have two antigen binding sites, whereas T cell receptors have only one antigen binding site.

c. B cell receptors are immunoglobulin in nature, whereas T cell receptors are not immunoglobulin molecules.

d. B cell receptor immunoglobulins can be secreted as antibodies, whereas T cell receptors are never secreted.

e. All of the choices represent differences between B cell and T cell receptors.

Since the 1970s, approximately 40 new infectious disease agents have been discovered, including SARS, chikungunya and zika. The ability of these agents to spread rapidly and cause global concern is due to all of the following except

Select one:

a. communities are becoming more densely populated.

b. communities are becoming more sparsely populated.

c. individuals are traveling more frequently and farther distances than in the previous half-century.

d. communities are spreading into rural areas/wildlife habitats.

Q.1

A gene has two introns and three exons. The length of exons 1, 2 and 3 is 600, 1200 and 300 bp, respectively, which are separated by 400 bp intron-1 and 800 bp intron-2. Suppose, a mixture of the dsDNA completely covering this gene and the processed mRNA it codes for is heated at 95C for 10 minutes, gradually cooled to room temperature and then viewed under electron microscope (EM). Draw the diagram of the DNA-RNA hybrid that you expect to see under the EM and answer the following questions. You should use different color for DNA and RNA strands , and label the regions that represent dsDNA, ssDNA and RNA-DNA hybrid. The diagram must take into account the length of introns and exons.

Q.2

What is the function of SR and silencer proteins that activates and represses splicing, respectively? Name the domains that are found in these proteins and explain their function. Explain how the splicing silencer proteins inhibit the function of the SR proteins.

greyfrog275

BIOL 3110 Lecture Notes - Interphase, Cell Nucleus, Reading Frame

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