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bogdanovich [222]
3 years ago
7

Help Please I'll give brainliest

Biology
1 answer:
SOVA2 [1]3 years ago
8 0

Answer:

A laboratory rat or lab rat is a brown rat of the subspecies Rattus norvegicus domestica which is bred and kept for scientific research. While less commonly used for research than mice, rats have served as an important animal model for research in psychology and biomedical science.

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CD4 and CD 8 are _______. A. proteins secreted by antigen-presenting cells B. receptors present on the surface of natural killer
kirill115 [55]

CD4 and CD 8 are molecules present on the surface of T cells where they interact with major histocompatibility (MHC) Molecules.

CD4 and CD8 improve T cell signalling by attaching to MHC class II (CD4) or MHC class I (CD8) molecules on APCs.

  • The association of CD4 with MHC class II significantly decreases the number of antigenic peptides necessary for T cell activation (5) and significantly boosts cytokine output by helper T cells.

The MHC molecules' wide polymorphism is their distinguishing trait.

  • This polymorphism is crucial for T cell antigen recognition.
  • A T cell detects antigen as a peptide bound by a specific allelic variation of an MHC molecule and will not identify the identical peptide bound by other MHC molecules.
  • This type of T cell activity is known as MHC limitation.

Hence, the correct answer is option C

Learn more about MHC here,

brainly.com/question/13259839

# SPJ4

5 0
2 years ago
1. What is hemoglobin?
Leno4ka [110]

Answer: "Hemoglobin is a protein in your red blood cells that carries oxygen to your body's organs and tissues and transports carbon dioxide from your organs and tissues back to your lungs."

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Read 2 more answers
Which of the following is TRUE of melanosomes?
fgiga [73]

Answer:

b

Explanation:

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What stores genetic information and passed it onto the next generation?
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The nucleus of our sex cells stores our genetic information
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Design an imaginary food web or describe a real one. Include at least 4 living organisms that interact in your ecosystem.
PtichkaEL [24]

The trophic web is the interaction between different organisms in which there is energy transference. In the attached example, we consider plants, beetle, rabbit, frog, eagle, fox, mountainlion, and fungi.

<h3>What is the trophic web?</h3>

The trophic web is the interaction between different organisms involving transference of energy when some of them feed on the other ones.

The ones placed at lower levels pass energy to the ones at the higher levels.

Organisms at each level feed on the preceding one and become food for the next one.

• The first link corresponds to a producer organism -autotroph-.

• The following links are the consumers -heterotrophs- ⇒ herbivores and carnivores.

• The last links are the decomposers that degrade organic matter from dead organisms.

Because it is a web, all organisms are in equilibrium until a change occurs. When a sudden change affects any of the involved links, there can be a cascade effect on the web.

Any change in a link population size (increasing or decreasing) will affect the superior links and the immediately anterior link.

Example.

To make the trophic web, first, we need to have at least four links.

So first, let us list the organisms we are working with, and then define the position of each of the organisms on the web.

  • plants,
  • beetle,
  • rabbit,
  • frog,
  • fox,
  • mountain lion,
  • eagle,
  • Fungi

<u>Producer</u> → this is the autotroph organism that takes energy from the sun or any other inorganic source → An example of this is any plant.

<u>Consumers</u> → heterotroph

⇒ Herbivores → These are the animals that feed on any part of the plants → These are the beetle and the rabbit

⇒ Carnivores → These are the animals that feed on herbivores → These are the frog, the fox, the eagle, and the mountain lion

<u>Decomposer</u> → detritivorous organisms that take energy from dead matter → Fungi

Trophic web,

  • Plants directly provide energy to the beetle and the rabbit

Plant >> Beetle and Rabbit

  • The eagle takes energy from the rabbit and the frog takes energy from the beetle.

Rabbit >> Eagle

Beetle >> Frog

  • The fox takes energy from the frog and from the rabbit

Frog and rabbit >> Fox

  • The Fox and the eagle transmit energy to the mountain lion.

Fox and Eagle >> Mountain lion

  • Fungi takes energy from dead organic matter

Plants, beetle, Rabbit, Fox, Eagle, Mountain lion >> Fungi

You will find an image in the attached files.

You can learn more about the trophic web at

brainly.com/question/8354950

#SPJ1

5 0
2 years ago
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