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12 Aug 2018

Simple retroviruses only require the gag, pol, and env genes, whileother complex
retroviruses encode additional proteins. Describe the function ofone of the additional
proteins produced by HIV-1.

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Jarrod Robel
Jarrod RobelLv2
13 Aug 2018

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Related questions

1. Which of the following statements about antibiotic resistancein bacteria is NOT true?

Select one:

a. Antibiotic resistance often originates from the microbes thatproduce antibiotics for their own survival.

b. The antibiotic resistance gene can be transmitted to bacteriavia transformation or transduction.

c. Antibiotic resistance cannot be conferred by conjugation asconjugation only affects the fertility of bacteria.

d. Environments where antibiotics are frequently used such ashospitals are under the higher risk of developing antibioticresistance.

e. The plasmid containing the antibiotic resistance gene canpass the genes to genetically unrelated bacteria.

2. You perform interrupted-mating experiments on three Hfrstrains (A, B, and C). Genes are transferred (from last to first)in the following order from each strain: strain A,thi-his-gal-lac-pro; strain B, azi-leu-thr-thi-his; strain C,lac-gal-his-thi-thr. How are the F factors in these strainsoriented?

Select one:

a. A and B are oriented in the same direction.

b. B and C are oriented in the same direction.

c. All of them are oriented in the same direction.

d. A and C are oriented in the same direction.

e. It cannot be determined from the information given.

3.Which of the following statements about retroviruses isfalse?

Select one:

a. All retroviruses contain gag genes whose product forms theviral protein coat.

b. Not all RNA viruses are retroviruses.

c. All retroviruses contain oncogenes, which can induce theformation of tumors.

d. All retroviruses require pol genes, which are critical forretrotranscription.

e. All retroviral genomes have gag, pol, and env genes.

4. Which of the following facts would NOT be considered as anadvantage for using bacteria and viruses for genetic studies?

Select one:

a. Low cost to maintain and little storage space required

b. Rapid reproduction and high progeny number

c. Genomes being small and readily subjected to geneticmanipulation

d. Complete absence of recombination, which maintains theintegrity of genome

e. Haploid genome for expressing mutations

1.)

Chromosomal changes:

Only cause cancer
Only result from cancer
have nothing to do with cancer
can both cause and result from cancer

2.)

How do retroviruses contribute to the development of cancer cells?

They activate all types of cell regulation simultaneously
They shut off all types of cell regulation simultaneously
If they insert themselves into regualtory genes and disrupt their function cancer can result

retroviruses play no role in cancer formation

Recombinant DNA I: Core Question 1a (1 point possible)

Why is biochemical purification of one gene away from the othergenes in a cell more challenging than biochemical purification ofone protein away from the other proteins in a cell? -unanswered

a)A cell has many more genes that it has proteins.

b) DNA is very unstable and is likely to be broken down duringthe purification process.

c) Proteins are larger molecules than genes.

d)The chemical nature of all genes is very similar; the chemicalnature of various proteins can be very different.

DNA I: Core Question 1b (1 point possible)

Which of the following are true of a vector, as described in thelecture? Check all that apply. -

- A vector is made of DNA

-A vector can be replicated by the host cell

-A vector can be put into a host cell by transformation

-A single copy of the vector can be found in each transformedcell

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