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Amanda [17]
4 years ago
5

Activated CD8 cells will mount a direct attack on target cells through the action of ____________ , which punch holes in membran

es, and ____________ , which then enter through these passageways.
Biology
1 answer:
lyudmila [28]4 years ago
8 0

Answer:

1. Perforins

2. Granzymes

Explanation:

The activated CD8 cells (the cytotoxic T cells) mount their immune response with the help of two proteins: perforins and granzymes.

Perforins are the proteins that stimulate the cytolysis of the infected cell by inserting itself into the plasma membrane of the infected cell to form channels. The channels in the plasma membrane of infected cells allow the surrounding fluid to enter the cell followed by its bursting.

Granzymes are the proteins that enter the infected cells through the channels formed by perforins and stimulate apoptosis.

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Segments of DNA transferred from parent to offspring are called <br> .
Rzqust [24]

Answer:

Segments of DNA transferred from parent to offspring are called genes

Explanation:

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7 0
3 years ago
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What is a non living part of the ecosystem
dusya [7]

Answer:

an Abiotic Factor

Explanation:

The non-living components of the environment are known as abiotic factors. Abiotic factors include things such as rocks,water,soil,light,rocks etc...

7 0
3 years ago
Bone formation begins when ____________ secrete the initial semisolid organic form of bone matrix called ____________ .
butalik [34]

Answer:

a. osteoblasts

b. osteoid

Explanation:

Osteoblasts are the fundamental cell of bone tissue. They are the cells that synthesize the bone matrix called osteoid from which it is made from the skeleton of bone fish, to the skeleton of humans. Since the bone skeleton is an evolutionary paraphiletic characteristic (it is present in several taxonomic groups that have evolved from the same ancestor).

Osteoblasts are responsible for the development and growth of bones during the juvenile stage of individuals and are also responsible for maintaining adult bone and regenerating bone when it breaks.

Osteogenesis is the process of differentiation of osteoblasts. The cells from which osteoblasts differ are called osteoprogenitors. The differentiation of osteoprogenitor cells, which come from the mesoderm, periosteum or bone marrow, is induced by growth factors called bone morphogenetic proteins (BMPs), capable of inducing the growth of bone, cartilage or connective tissue. When an osteoprogenitor cell receives a BMP signal, it quickly begins to express the genes to generate collagen, osteonectin and alkaline phosphatase, among other compounds necessary for bone growth. When the bone grows, it ends up wrapping some of the osteoblasts and they lose their ability to replicate, at that time they are dedicated to bone maintenance and not to their synthesis and are called osteocytes.

6 0
3 years ago
Sort the items based on whether they have gravitational potential energy or chemical potential energy. liquid petroleum gasoline
poizon [28]

Explanation:

Gravitational potential energy is the energy of body due to its position in the gravitational field.

Whereas chemical potential energy is the energy within the chemical bonds of a substance.

For example, when we eat an apple then we get energy in our body so, it is the chemical potential energy stored in the apple.

Items sorted on the bases of gravitational potential energy and chemical potential energy are as follows.

Gravitational potential energy:

  • a ball thrown up in the air.
  • a stone rolling downhill.
  • water stored in an overhead tank.

Chemical potential energy:

  • liquid petroleum gasoline used in cars.
  • apples that people eat.
  • firecrackers that people set off.
4 0
4 years ago
This variable could also be called the potential effect?
larisa [96]

False.

It can either be called Dependent or Independent variable.

Hope this is correct :)

Have a great day

8 0
4 years ago
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