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
Artist 52 [7]
3 years ago
10

Exponential population growth happens when: Select all that apply.

Biology
1 answer:
Ann [662]3 years ago
7 0

Answer:

There are plenty of resources.

No predators are present.

Explanation:

There r plenty of resources + no predators

You might be interested in
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
2 years ago
What is happening when cells start to swell up with water?
marin [14]
When cells start to swell up with water, Osmosis takes place.
6 0
3 years ago
Read 2 more answers
What is the correct order of respiration?
AleksAgata [21]
Glycolysis, Krebs cycle, electron transport chain
4 0
3 years ago
Read 2 more answers
The brain's ability to restructure its neural networks to maximize functioning after an injury is known as
igor_vitrenko [27]
This capacity is known as Neuroplasticity. Neuroplasticity is the change in neural pathways and neurotransmitters that happens because of specific variables, similar to conduct, condition, or neural procedures. Amid such changes, the cerebrum participates in synaptic pruning, erasing the neural associations that are never again fundamental or helpful, and reinforcing the vital ones.
7 0
3 years ago
How are tissues , organs , and organ systems similar
jeka94
They are both the building blocks of life
6 0
3 years ago
Other questions:
  • At carrying capacity, the number of organisms being born equals the number of organisms _____.
    12·1 answer
  • The skeletal diagram below shows variations that were present in their common ancestor. Using the diagram determine what most li
    8·1 answer
  • The estimated daily basal metabolic rate for a man who weighs 150 lb is _____ kcal.
    6·2 answers
  • A student draws a fence with several gate as part of a model of cellular transport explain what defence indicates represent blam
    10·1 answer
  • Describe why the amount of light available to the Chlorella culture might affect the growth dynamics of the alga.
    12·1 answer
  • Different species of bumblebee compete for flower nectar in their ecosystem.
    8·2 answers
  • Help meeeee please :(
    11·1 answer
  • 1 point
    6·1 answer
  • Your body produces about 300 million cells every minute. Why is it important that mitosis is a
    5·1 answer
  • Every tRNA has an anticodon. What is the purpose of an anticodon?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!