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kirill115 [55]
3 years ago
8

A host cell infected by a virus will activate the adaptive immune response through _______. (Select all that apply) Dendritic ce

ll Macrophages MHC I molecules Cytotoxic T cell MHC II molecules Helper T cell
Biology
1 answer:
Inga [223]3 years ago
4 0

Answer:

Cytotoxic T cell

Helper T cell

Explanation:

Adaptive immune system is a part of the immune system initiated only when there is an attack by a pathogen or foreign substance. The adaptive immune system is beckoned on when the infection is insurmountable for the body's first line of immunity, which is the innate immune system.

The adaptive immune response is triggered by the white blood cells called LYMPHOCYTES. Lymphocytes consists of T cells and B cells. T cells are either cytotoxic or helper T cells. The cytotoxic T cells kills the cells infected with the virus while the Helper T cells activate every other cell involved in the immune process.

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Mammals in Australia are called marsupials, and diverged from the placental mammals very early in mammalian evolution. Australia
mamaluj [8]

Answer:

The correct answer is homologous.

Explanation:

A structure that is derived from a common ancestor is called homologous structure. So homologous structure is the characteristic of divergent evolution that means divergent evolution give rise to homologous structures.

So as the marsupials are mammals that were diverged from placental mammals very early in mammalian evolution, the membranes of skin that allow Australian sugar gliders and North American flying squirrels to glide are homologous because divergent evolution gives rise to homologous structures.

The function of these homologous structures can be the same or can be different. Therefore the correct answer is their membrane are homologous.

7 0
3 years ago
What are some signs of weathering?
larisa86 [58]
Cracks in rocks or mountians

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The amount of life that can be supported in a particular ecosystem is limited by which of the following?
Elina [12.6K]

Answer:

the answer is all of them

Explanation:

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3 years ago
The rigid layer that is present in the cell walls of bacteria that is primarily responsible for the strength of the wall is know
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The substance that helps keep the integrity of the bacterial cell wall intact is known as the peptidoglycan. Others also refer to is it as murein or mucopeptide. The bacterial cell wall is necessary for survival because of the high internal pressure present inside of bacteria. Under normal conditions, if the cell wall is removed the bacterial cell will burst.

The peptidoglycan is a layer that can be used to distinguish gram positive bacteria from gram negative ones. G(+) bacteria have a thick layer of this while G(-) have a thinner ones.
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An increase in organ size and function caused by increased workload is termed a. atrophy. b. hypertrophy. c. metaplasia d. infla
V125BC [204]

Answer:

hypertrophy

Explanation:

Hypertrophy is the excess enlargement of a tissue. When a tissue or organ overgrow without any cell division, it is called hypertrophy. For example, muscular hypertrophy occurs when there is a very forceful and repetitive muscular activity as it occurs during strength training. It triggers enlargement of muscle fibers as myofibrils, mitochondria, and other organelles are produced more in number to support the excess workload of the muscles.

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