Answer:
They are stimulated by an antigen.
Explanation:
Natural killer cells are cytotoxic cells that help our body in innate immune response. These are an critical and important component of the innate immune system of our body. These natural killer cells provide a rapid response towards the virus infected cells. These cells have capability to detect MHC that are present on the infected cells. Natural killer cells do not require activation for killing those cells which are missing MHC I. Due to this feature, they are named as the Natural killer cells. These cells can directly induce the death of tumor cells and play an important role in immunosurveillance.
O+ because it is a general donor to all the positive blood groups
Answer:
The correct answer is the first option which represent the structure of a nucleotide.
Explanation:
DNA double is formed by the attachment of deoxy ribonucleotides joined to one another by phosphodiester bond during the course of DNA replication.
DNA is a nucleic acid.As a result it is a macromolecule.The macromolecular structure of DNA consist of numerous deoxy ribonucleotides.
Answer: the white
Explanation: the white allele for flower color is recessive to the red flower-color allele. And, if it has a red allele and a white allele, its flowers will be red or pink rather than white.
