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zzz [600]
3 years ago
8

Question 17

Biology
1 answer:
RideAnS [48]3 years ago
4 0
<h2>Answer:</h2>

Removal of the tarnish from the silver is a <u>physical change</u>.

<h2>Explanation:</h2>

The type of change which doesn't produce any new substance is called as physical change. Tarnish refers to the thin black layer that is formed on the silver. Formation of tarnish is chemical change as due to oxidation a black color layer is formed.  

On the other hand, removal of tarnish from silver is considered as physical change as no new product is formed and only we are obtaining the silver in its pure form.

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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
3 years ago
Why might food scientists improve your favorite breakfast food?
Makovka662 [10]
They might improve it because you eat it everyday. If you eat it everyday, it should be healthy and nutritious. They aren't going to want to make bad food that kids eat everyday, end up putting in something not good or healthy, then getting sued. They are going to make the best quality food.
~Silver
4 0
3 years ago
Identify the genotype for this pedigree chart
Zepler [3.9K]

Lets say that the genotypes are:


Male affected:XbY


Male unaffected: XaY


Female  affected: XbXb


Female carrier: XaXb


Female unaffected:XaXa


P: XbY  x  XaXa


F1: XaXb  XaXb  XaY  XaY The middle square is female carrier.


P:XbY  x  XaXb


F1: XaXb  XbXb  XaY  XbY The left square is affected female.


P:XaY  x  XbXb


F1: XaXb  XaXb  XbY  XbY The right square is affected male.



6 0
3 years ago
Read 2 more answers
Where is the first place you should start when diagnosing a hardware
zepelin [54]

Answer:

Check the power supply

Explanation:

verified just got it right

7 0
3 years ago
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Which instrument has an enclosed reed and produces a buzzing sound
Oliga [24]

Answer:

The tuba

Explanation:

The tuba produces sound by vibrating or buzzing the lips into a large cupped mouth piece. It produces different pitches by changing the mouthpiece.

4 0
2 years ago
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