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bija089 [108]
2 years ago
10

How many chromosomes do birds have.

Biology
2 answers:
evablogger [386]2 years ago
8 0
Answer:

80 chromosomes
Andrews [41]2 years ago
4 0

Answer:

80 Chromosomes

Explanation:

In general, bird karyotypes have a high diploid number (2n) of typically around 80 chromosomes that are divided into macro- and microchromosomes.

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If you treated embryos with a Notch inhibitor how would this affect the specification of venous and arterial endothelial cells?
Alisiya [41]

Answer:

d. all endothelial cells would be venous

Explanation:

The Notch signaling pathway is a cell signaling system which consist basically of 4 NOTCH genes ( NOTCH1, NOTCH2, NOTCH3, and NOTCH4) each of them having the information to build a particular cell membrane receptor protein.

It has been demonstrated in zebrafish embryos that Notch signaling are highly determinant factors during vascular development, and a key function of these genes was specifically to regulate the differentiation of arterial fate in endothelial cells.

Notch signaling-deficient embryos showed a loss of expression of arterial markers such as ephrinB2 from arterial vessels with an accompanying expansion of venous markers into normally arterial domains. In contrast, embryos in which Notch signaling had been ectopically activated, meaning an activation out of "proper" place (where not expected, e.g. venous endothelial), exhibited the contrary phenotype, this is a suppression of vein-specific markers with ectopic expression of arterial markers in venous vessels.

To summarize, when Notch is supressed (in this case inhibited with a specific Notch inhibitor) arterial fate of endothelium is not followed, and venous fate is stablished. Thus, endothelial cells (those expected to form venous tissues but also arterial ones) would specified as venous.  

4 0
2 years ago
Someone help me with this
nadya68 [22]
A horseshoe crab has been around for almost 500 million years. They are classified as arthropods and not actual crabs. However, There are many reasons that have helped them survive this long including, they can eat almost any organic matter. There blood is different from normal, in fact it’s blue. This blood helps them heal any wounds right away. They can also live in areas with very low levels of oxygen, meaning habitat is not a big issue for them. Evolution has also helped them grow and adapt seeing as they’ve survived this long.

Hope that helps:)
5 0
3 years ago
An infectious disease researcher isolates the pathogen responsible for an emerging disease. The microbe is grown in the lab. A p
malfutka [58]

An infectious disease researcher isolates the pathogen responsible for an emerging disease. The microbe is grown in the lab. Preparation of the laboratory-grown microbe is treated with a lethal dose of ionizing radiation and then tested for its potential as a vaccine and this is  Inactivated type of Vaccine.

<h3>What exactly are pathogens?</h3>

Pathogens include viruses, bacteria, fungi, and parasites that can enter the body and harm the immune system. Among many additional viruses that can lead to serious illnesses are anthrax, HIV, the Epstein-Barr virus, and the Zika virus.

<h3>What is vaccination?</h3>

An easy, secure, and reliable method of preventing hazardous infections before you are exposed to them is vaccination. It boosts your immune system and builds up your body's natural defenses against particular infections.

<h3>Inactivated vaccine:</h3>

In inactivated immunizations, the disease-causing microorganism is eliminated.

Inactivated vaccines typically don't provide as strong of immunity (protection) as live vaccines. Therefore, it can take several doses (booster injections) throughout time to keep up your resistance to diseases.

Using inactivated vaccinations, you can guard against

  • Flu
  • Hepatitis A
  • Polio
  • Rabies

Learn more about Vaccines here:-

brainly.com/question/27189850

#SPJ4

3 0
1 year ago
Do buffalo compete for food with other herbivores? If so, for what food and when?
irakobra [83]

Answer:

Sure grass.  And there is a lot of grass. Compete with wild horses, wild pigs, wild goats, wild "golfer's who are way off the fairway. Wild deer are in the forests, wild goats in the hills so buffalo and horses manage the plains and the back nine.  So much grass there was no competition...with the wild rabbits.  Grass continues to grow.  The buffalo move to greener pastures once they mowed down the other fields.  When there were Millions of them, they were not starving.

Explanation: Got this from somewhere hoping it helps!

5 0
3 years ago
Read 2 more answers
Which is not a compound?<br> 8H 2<br> 5HCI<br> 6Cao<br> он 20
Nikolay [14]

Answer:

8H 2 because a compound consists of two or more elements

4 0
3 years ago
Read 2 more answers
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