Rain is expected in Billings is the correct answer
1. The correct answer is: The viral envelope proteins interact with CD4 and a co-receptor on the cell membrane.
Binding and entering the host cell are the first steps of the HIV virus infection. So, these steps play a major role in determining the ability of HIV to degrade the human immune system. Binding of HIV to CD4+ T lymphocytes (express chemokine receptors CCR5 and CXCR4 called co-receptors) triggers the fusion of the viral and host cell membranes, initiating infection (viral core gets into the cytoplasm).
Attachment of the virion can be:
• Nonspecific-envelop protein of the virus (Env) binds to cell-surface heparan sulfate proteoglycans
• Specific-Env binds to integrin.
2. The correct answer is: Activation of the host cell by cytokines, growth factors, or antigens.
After the viral capsid enters the cell, single-stranded RNA genome is released from the attached viral proteins and copied it into a complementary DNA (cDNA) molecule thanks to an enzyme called reverse transcriptase. Next step is the integration of the viral DNA into the host cell's genome. This process is done by another viral enzyme called integrase. The integrated DNA is transcribed into RNA and then translated into proteins that will help the package of new viruse particles.
3. The answer is: false
Reverse transcriptase is an enzyme that catalyzes the formation of DNA from an RNA template. Since the genome of the virus (HIV) is single stranded RNA, reverse transcriptase copies it into a complementary DNA (cDNA) molecule. Thanks to this enzyme, formed cDNA can be integrated into host’s genome. Because of this proprety, antiretroviral drugs used to treat HIV infection work as reverse-transcriptase inhibitors.
Well think about it during that time it is freezing cold the water cycle comes up from a sea and makes clouds that will be no effect to it but what happens when you put water in a freezer its cold so the result is its gonna hail
Answer:
The foundation for biological evolution or descent through modification is all living things are made of one or more cells
Explanation:
In biology, every living organisms possess one or two cells because that is the basic unit of life. some organisms are unicellular (single-cell organism) and multi-cellular organisms such as man. The fundamental of every living organism is based on cell which later forms tissue then organ before it eventually forms a system that function together as an entity.
Explanation:
The common cold, also called viral rhinitis, is one of the most common infectious diseases in humans.
