Professional antigen-presenting cells, such as phagocytes, are the first cells to encounter a pathogen (apcs). This means they have the ability to activate cells of the adaptive immune system.
<h3>What is meant by Pathogen?</h3>
- A pathogen is an organism that infects its host with disease, and the severity of the disease symptoms is referred to as virulence.
- Pathogens include viruses, bacteria, unicellular and multicellular eukaryotes, and a wide range of other organisms.
- The bone marrow of an average healthy adult generates 100 billion new neutrophils per day. Because there are so many neutrophils in the body at any given time, they are often the first cells to reach the site of an infection.
- Long thought to be a component of the innate immune system, complement has recently emerged as an important regulator of the adaptive immune response.
Therefore the correct option is D) can activate cells of the adaptive immune system.
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Instead, according to a research team that looked at DNA samples from the two species and from black bears, the brown bear and polar bear ancestral lines have a common ancestor and split about 600,000 years ago.
Answer:
Density-dependent factors include disease, competition, and predation.
Explanation:
Answer:
For [a] .....Yes
For [b]......No
Explanation:
Meiosis is known to be a process of reducing the number of chromosomes in a diploid to half.
And it should be noted that , meiosis requires the pairing of two chromosomes sets.
Therefore in this case, before meiosis can occur in the haploid, it must involves two haploids. This means that two individual haploid will fuse together to form diploid meiocyte, which will allow meiosis to occur.
This is the reason why meiosis can only takes place on haploid species.
In summary, it should be noted that, meiosis can only takes place in a diploid and two individuals haploid [ haploid species] that can fuse together to form diploid, but not in a haploid individual.
<span>The genetic code is redundant, that means same genetic code is present in multiple times, in each cell. it acts as "nature's safety net" because if we happen to lose a part of our body or genetic material, it can be regenerated using the remaining part which contains the same genetic code.</span>
