Macrophages are a type of the White Blood Cells that is a part of the immune system of the body. Macrophages are the first line of defence. They engulf the foreign bodies, foreign particles, cancerous cells and infected cells. They do it by searching for a protein marker on the surface of these foreign bodies. When the marker is absent they attack these bodies by performing phagocytosis.
Langerhans cells present on the skin are specialised macrophages that form the first line of defence.
Answer:
B
(The result of DNA replication is two DNA molecules consisting of one new and one old chain of nucleotides. This is why DNA replication is described as semi-conservative, half of the chain is part of the original DNA molecule, half is brand new.)
Answer:
Genotype is the potential, it is the set of genes.
Phenotype is the expression of those genes, showing the dominant/ activated gene.
For example, my mother and members of her family are short with hazel eyes and dark hair.
My dad and his family are tall, with brown eyes and dark hair.
I will have genes for height that vary- short or tall. I will have genes for eyes hazel or brown.
I will have genes for hair- dark.
You don’t know, based on what i’ve told you, what my height or eye colour is. That’s my genotype.
I am tall, with hazel eyes and dark hair. That’s my phenotype.
This is really over simplified, but it should help you understand.
Genotype is the blueprint/ building plans. Phenotype is the building.