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
Vesna [10]
3 years ago
12

Which region would be the warmest during daytime? A. B. C. Or D.?

Biology
2 answers:
marissa [1.9K]3 years ago
5 0
Region A, Hope this helps.
vredina [299]3 years ago
3 0

region A because it is not shaded off by buildings or trees.

You might be interested in
As seen in the venn diagram, meiosis is responsible for the production of haploid gametes. somatic or body cells are 2n cells. t
Simora [160]
This change in chromosome number is the result of B. Fertilization. Both of the individual gametes from the male and female combine together to produce a zygote or developing offspring that is diploid in most cases, and possess both sets of genetic content or chromosomal information, one from each parent.
8 0
3 years ago
Read 2 more answers
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
Explain what would happen if a mistake is made during meiosis
Varvara68 [4.7K]

Errors can occur when the chromosomes segregate into the gametes during meiosis resulting in egg or sperm with too many or too few chromosomes. As a result, fertilised eggs and the ensuing embryos may have trisomy (an extra chromosome of a particular pair) in each cell or monosomy (one chromosome fewer in each cell).

3 0
3 years ago
Read 2 more answers
Explain how carbon based rings and chains can form very large molecules
saul85 [17]

Answer:

Carbon based rings & chains form very large molecules because carbon can form up to 4 covalent bonds to form these rings and chains, and these bond with other rings and chains over and over. ... Lipids, proteins, carbohydrates, and nucleic acids are the 4 main types of carbon-based molecules in organisms.

Explanation:

3 0
3 years ago
Which is true about reaction rates? A. High reaction rates occur only in spontaneous reactions. B. Low reaction rates occur only
kirill115 [55]
The correct answer is D) <span>Reaction rates are not related to spontaneity</span>
8 0
3 years ago
Read 2 more answers
Other questions:
  • most matter in the natural world is a mixture of substances. Consider seawater, dirt, and plants. Explain why each of these exam
    6·2 answers
  • The signals for voluntary muscle movements originate in a band of tissue called the _____, which is located on the _____ lobe.
    10·2 answers
  • Plz help!!! lots of points!!!
    5·2 answers
  • Which is part of the spindle apparatus?
    14·1 answer
  • A theory of evolution that states that a species evolves in spurts of rapid change and then goes through periods of no change is
    7·2 answers
  • At which stage of the scientific process would a scientist look at experimental data from other scientists to set up an experime
    6·1 answer
  • 20 points
    7·1 answer
  • Simplify.jkkjjjjnndnsnxnxmxmmxmmzmmxnebnddnnxmortysjxh bdmxmxkxjx
    11·1 answer
  • Where does the heat that warms your body come from? Explain your answer.
    9·1 answer
  • Attitudes are _____ that guide behavior .
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!