Question

49.

Comparing the HIV virus to the phages discussed in class... 

Select one: 

a. Phages can infect eukaryotes broadly, while HIV infects humans alone 

b. Both HIV and phages are encapsulated viruses that have phospholipid membranes surrounding their protein capsids 

c. HIV uses glycosylated, host-derived proteins, while phages use protein spikes, to interact with their host cells facilitating infection 

d. In the extracellular space, both HIV and phages utilize DNA as their genetic material 

e. HIV and virulent phages are capable of integrating into their respective host's chromosomes

50.

The following pedigree corresponds to a family affected by a rare autosomal recessive condition. What is the probability for the unborn child marked with "?" to be a carrier? 

Provide your answer as a decimal fraction up to the second digit after the period and do not round up or down. (.e. if your result is 1/3 then write 0.33) ? 

Answer 1

49) HIV and virulent phage are not integrating into the host cell chromosomes as the HIV is a retrovirus and insert the RNA into the host cell. The DNA is formed from the RNA by the process of reverse transcription which result in the formation of DNA that binds with the hosts chromosomes for the formation of other copies of HIV viruses . Macrophages are also known as HIV factory. T lymphocyte count decreased from 1200 to 300 per ml.In case of Retroviruses , it is formed in the cytoplasm and there is no integration with the cytoplasm.

HIV is a retrovirus whereas phase can be double or single stranded DNA or single stranded RNA. Phage can infect the bacterias and is known as bacteriophage . HIV virus attaches to the cell membrane proteins and glycoproteins . The capsid molecule of the HIV virus is removed after the penetration of enzyme into the host cell. The formation of DNA takes place in the nucleus and the formation of RNA takes place in the cytoplasm in case of HIV virus . In case of phage , it takes place in the cytoplasm. The tail fibres of the phage attach to the cell wall of bacteria and enters into bacteria without removal of capsid. The capsules of HIV virus and phage is made up of proteins and there is no role of phospholipids in the protein coat.

Hence , option C is the correct answer .