Answer:
D
Explanation:
Proton: positive charge
Electron: negative charge
Neutron: neutral charge
There are protons and neutrons in the nucleus, so there will always be a positive charge in the nucleus
When an antigen is bound to a class i mhc molecule, it can stimulate a cytotoxic T cell
A transmembrane chain, which is produced by a class I MHC gene, plus a tiny extracellular protein known as 2-microglobulin make up class I MHC proteins. The gene that encodes the 2-microglobulin does not belong to the MHC gene cluster, and it does not traverse the membrane.
The cytotoxic T cell interacts with a virally infected cell via its T cell receptor and the MHC class one protein on the virally infected cell, which is the interaction between the MHC class one protein and the cytotoxic T cell. The identification of targets for destruction by a cytotoxic T cell depends on this interaction between the T cell receptor and MHC class one.
Learn more about cytotoxic T cell here;
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Deltas are similar to alluvial fans in shape, but are deposited in a different environment. Sediments that form deltas are transported in continuous flowing water. Delta deposits are found at the mouths of streams or rivers as they empty into lakes and oceans.
The answer is A. organism, species, community.
Organizational hierarchy is the hierarchy of complex biological structures. From least complex to most complex the order is as following:
atom, molecule, organelle, cell, tissue, organ, organ system, organism, population, species, community, ecosystem, biome, biosphere.
So, A is the right choice:
Organism is the basic living system. The higher level is species - a group of organisms that are able to reproduce. The higher level is community - an interspecific<span> group that includes interacting populations.</span>
The first one. Mary asked how much the puppy cost.