Which of the following models best depicts how the genetic information in a retrovirus is eventually translated into proteins? A) DNA in the retrovirus → RNA in the host cell → Proteins B) RNA in the retrovirus → DNA in the host cell → RNA in the host cell →

Identify the single most correct answer: a) Ribosome is an organelle found in both prokaryotes and eukaryotes. Ob) During conjugation a naked DNA molecule found in the surroundings gets into bacteria. c) Spontaneous mutation cannot result in the production of an altered protein. Od) Gene transfer from one species of bacteria to another (donor to recipient) represents horizontal gene transfer.

Chemical mutagens often cause oxidation or deamination of DNA bases. This can lead to cancer by causing: A) Activation of replication. B) Activation of transcription. C) Non Watson-Crick base pairing. OD) Changes to cytochrome P450 enzymes. OE) Activation of translation.

If a scientist wanted to introduce a transgene into a plant, which of these techniques would they be likely to use? A.) Inject a P element vector into a pollen grain. B.) Inject a genetically modified nucleus into an enucleated plant cell. C.) Inject a transgene into a seed. D.) Infect plant cells with bacteria containing T-DNA.

Which of the following self-replicating biological agents carries only one polynucleotide chain as its genetic material, does not code for any proteins, and does not have any nucleocapsid? the RNA virusoid known as hepatitis delta virusoid the single-stranded RNA virus known as human immunodeficiency virus the double-stranded RNA virus known as rotavirus the double-stranded DNA virus known as pandoravirus the RNA viroid known as citrus exocortis viroid       The human precancerous disorder known as xeroderma pigmentosum is caused by which of the following mutagenic conditions? thymine dimers demethylation deacetylation depurination deamination      7. Who discovered that DNA synthesis in the intact chromosomes of rapidly-growing bacterial cells is continuous on the leading strand, but discontinuous on the lagging strand? Rosalind Franklin and Maurice Wilkins Matthew Meselson and Franklin Stahl Erwin Chargaff and Arthur Kornberg Reiji Okazaki and Tuneko Okazaki James Watson and…

An antimicrobial drug binds to the HIV reverse transcriptase enzyme, preventing it from working. Which of the following is true of this drug?     It would inhibit early replication steps of some viruses, but not affect normal eukaryotic cell activity.     It would directly interfere with translation of some viral proteins and some eukaryotic proteins.     It would block assembly/maturation steps of some viruses, and interfere with translation in eukaryotic cells.     It would interfere with release of newly formed viruses from a host cell, but not affect eukaryotic cells.     It would interfere with protein synthesis in bacteria, but not affect eukaryotic ribosomes.     It would interfere with mRNA transcription in bacteria and viruses, but not affect eukaryotic transcription.

The complete coronavirus genome sequence from the first known patient infected with SARS-CoV-2 was published on January 10th 2020, just a short time after the patient had been hospitalized in China with respiratory symptoms. They did this so quickly using nanopore sequencing. Scientists compared the genome sequence from the new coronavirus (SARS-CoV-2) with the genome sequences from several other coronaviruses and they did identify a sequence unique to the SARS-CoV-2 strain. This unique sequence was in the N gene of the viral genome. What protein is made from the N gene of the virus?

Epidemiologists at the CDC in Atlanta, GA, have called you in to investigate an increased incidence of leukemia in a remote region of Africa. Shortly after you arrive, an RNA virus was isolated from patients and found to induce leukemia in mice. At this point, you don't know the viral gene product or the mechanism that causes development of leukemia. One of your lab assistants has isolated a variant of the virus that is missing 20% of the genome of the original virus and does not induce leukemia in mice. a) How would you determine which portion of the genome is associated with the development of leukemia? b) How would you determine the viral product or mechanism associated with the development of leukemia?

A patient is admitted to the hospital with a viral infection and is immediately treated with broad-spectrum antibiotics. How will the course of the infection be affected by this treatment? The infection's length will remain the same because viruses do not have DNA or RNA, and so antibiotics do not affect them. The infection's length will be shorter because antibiotics can prevent viral entry into the cell by binding to host-receptor proteins. The infection's length will remain the same because antibiotics have no effect on eukaryotic cells or viruses. The infection's length will be shorter because antibiotics activate the immune system, and this decreases the severity of the infection.

Viruses are made up of the same biomolecules as cellular organisms (DNA, RNA, proteins, lipids, etc.), which are synthesized through enzymatic dehydration reactions from building blocks and disassembled by enzymatic hydrolysis. They infect cells and replicate themselves using resources from the host cells. Scientists discovered a previously unknown strain of virus in the tropical Pacific Ocean and it can infect higher-order eukaryotes. Initial analysis revealed that the virus is mainly composed of nucleic acids, proteins, and lipids. Chemical analysis after complete hydrolysis revealed the following building blocks (by weight): Chemical components Nucleosides Amino acids Lipids, phosphates, and carbohydrates Percentage by weight 20 30 50 Analysis of percentages of nucleosides yielded the following results (by molar ratio): Nucleosides A G T C U Percentage by mole 19 29 19 29 4 Which of the following events mostly involves hydrolysis reaction after the virus infects…