1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Solnce55 [7]
3 years ago
9

The genetic condition of an organism that has two identical alleles for a given trait.

Biology
1 answer:
NikAS [45]3 years ago
5 0

"An organism in which the two copies of the gene are identical — that is, have the same allele — is called homozygous for that gene. An organism which has two different alleles of the gene is called heterozygous."

You might be interested in
Which statement best illustrates the function of RNA in relation to DNA and proteins? A. Proteins make DNA, which then creates R
forsale [732]
<span>Proteins make DNA which then creates RNA.</span>
6 0
3 years ago
Following antigenic stimulation, phosphorylation of _________ relieves inhibition of the transcription factor
Maru [420]

Answer: zap70, ITAM.

Explanation:

An antigen is any substance that is capable of stimulating an immune response by activating lymphocytes, which are the body’s infection-fighting white blood cells. Examples of antigens could be proteins that are part of bacteria or viruses or components of serum and red blood cells from other individuals, all of them are foreign antigens originated outside the body. However, there can also be autoantigens (which are self-antigens), originated within the body. In normal conditions, the body is able to distinguish self from nonself. <u>And the antigens that represent a danger induces an immune response by stimulating the lymphocytes to produce antibody or to attack the antigen directly</u>. This is called an antigenic stimulation of the immune system.

ZAP-70 (Zeta-chain-associated protein kinase 70) is a protein that is part of the T cell receptor, thereby it plays a critical role in T-cell signaling. When the TCR (receptor of T cells) is activated by the presentation of the specific antigen through the MHC, a protein called Lck acts to phosphorylate the intracellular CD3 chains and the ζ chains of the TCR complex, allowing the binding of the cytoplasmic tyrosine kinase, ZAP-70. Lck then phosphorylates and activates ZAP-70, which in turn phosphorylates another molecule in the signaling cascade called LAT (short for Linker of Activated T cells), a transmembrane protein that serves as an anchor site for several other proteins. The tyrosine phosphorylation cascade initiated by the Lck culminates in the intracellular mobilization of calcium ion (Ca2+) <u>and the activation of important signaling cascades within the lymphocytes.</u> These include the Ras-MEK-ERK pathway, which is based on activating certain transcription factors such as NFAT, NFκB and AP-1. These transcription factors regulate the production of of certain gene products, most notably cytokines such as interleukin-2 that promote the long-term proliferation and differentiation of activated lymphocytes.

The ITAM motifs (immunoreceptor tyrosine-based activation motif) are sequences of four amino acids present in the intracellular tails of certain proteins that serve as receptors within the immune system. Thus, <u>some receptors such as the TCR have ITAM sequences that, when activated, trigger an intracellular reaction based on consecutive phosphorylations</u>.  Kinases are recruited for this purpose.

So, ZAP-70 is a protein tyrosine kinase with a role in T-cell receptor signal transduction. During T-cell activation, ZAP-70 binds to ITAM and becomes tyrosine phosphorylated. The binding of ZAP-70 to the phosphorylated ITAM is able to activate its kinase activity, <u>and relieves the inhibition of the transcription factor which regulates genes that are involved in the immune reaction</u>.

6 0
3 years ago
In a recent experiment, anti-bacterial hand sanitizer was compared to hand soap. Students washed their hands using the sanitizer
Rainbow [258]

Answer:

B

Explanation:

The soap brands cultivated less bacteria culture than the warm water and hand sanitizer.

7 0
3 years ago
Brainly.com
zubka84 [21]
C. Ball and socket joints

Just took the test hope this helps :)
8 0
3 years ago
Read 2 more answers
Benefits of animal research
m_a_m_a [10]

Answer:

because it helps the humans to understand more resharch

Explanation:

4 0
2 years ago
Other questions:
  • What might be one way of slowing down global warming?
    11·2 answers
  • Based on the passage, which of the following is correct?
    6·1 answer
  • Cellular respiration and fermentation both?
    5·2 answers
  • What molecule synthesized by plants is a major source of energy for cellular processes in both plants and animals
    9·1 answer
  • DNA is double stranded helix, connected by what could be described as "ladder rungs". These rungs are actually nucleotides, the
    6·2 answers
  • Plants with a large number of stomata on their leaves tend to live in <br> environments.
    15·2 answers
  • Which phyla move by using pseudopodia?
    9·1 answer
  • PLIZZZZZ CAN SOMEONE CAN HARLP ME
    5·1 answer
  • in a tropical forest the trees often grow very closely together, which reduces the amount of light reaching the forest floor. th
    12·1 answer
  • What are the characteristic of a quib?
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!