Which of the following statements about signal deactivation is false?A. Hormone response systems respond to very small changes in hormone concentration.

B. Second messengers are short-lived because cytoplasmic enzymes convert them to their inactive forms.

C. When G proteins hydrolyze GTP to GDP, they become inactive and halt production of second messengers

D. Phosphatases terminate phosphorylation cascades by adding phosphate groups to proteins in the phosphorylation cascade.

Answers

Answer 1

Answer:

The statement- "Phosphatases terminate phosphorylation cascades by adding phosphate groups to proteins in the phosphorylation cascade." is false. option D is correct.

In a phosphorylation cascade, protein kinases, the phosphorylate proteins and protein phosphatases dephosphorylate them.

For a phosphorylation cascade, the source of phosphate is ATP (adenosine triphosphate). In a phosphorylation cascade, a phosphate group is transferred from ATP to a protein, which activates or deactivates the protein, depending on the specific cascade.

This process in which phosphate group is transferred from ATP to protein is carried out by enzymes which are known as protein kinases.

Thus, option D is correct.

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Answer 2

Answer:

Answer:Phosphates terminate phosphorylation cascades by adding phosphate groups to proteins in the phosphorylation cascade.

Explanation:

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At some point in their lives, all chordates have a flexible supporting rod in their backs called a

Answers

The right answer is notochord.

La chorde (ou notochorde), issue du mésoderme axial, est une structure embryologique cartilagineuse, spécifique de l'embranchement des Chordés (Chordata), auquel appartiennent notamment les Vertébrés (Vertebrata).

Elle constitue une sorte de baguette rigide mais flexible, formée de grandes cellules et située dorsalement entre le tube neural et le tube digestif. Elle est également un important centre de signalisation, produisant notamment la protéine Shh qui permet la formation du sclérotome à partir des somites ou « mésoblaste dorsal » (et donc les vertèbres) et la mise en place de l'axe dorso-ventral du tube neural.

La chorde est entourée de somites qui sont pleins et métamérisés.

The notochord is a flexible rod made out of a material similar to cartilage. If a species has a notochord, it is, by definition, a chordate.

Is there DNA in your food? how do you know?

Answers

there isn't until u eat it because ur saliva gets into ur food as u put ur fork or spoon in it so until u put a fork that u put into ur mouth then there would be DNA.

yes, of course there is. If you are eating meat, its right in the cells. Just because the cells are dead, doesnt mean the DNA disappeared. It would take a while for it to disappear. If you are eating vegetables its there. Its in bread too because this is made from wheat, a plant. However, if you are eating rocks you would not find DNA.

The remora attaches itself to sharks by means of its mouth. It gets free transportation and protection and also the remnants of food material that escapes the shark's mouth. The shark does not benefit and is not harmed in any way by the remora. What kind of interaction do the remora and the shark demonstrate?A. Commensalism

B. Parasitism

C. Mutualism

Answers

B im not sure................................................

The diagram illustrates the process of creating genetically modified corn.What occurs at step 4 in the diagram?
The foreign DNA is placed in a mechanical vector for cloning.
The foreign DNA is placed in a biological vector for cloning.
The foreign DNA is inserted into the host cell genome.
The foreign DNA is isolated by restriction enzymes.

Answers

The answer is The foreign DNA is placed in a biological vector for cloning.

After target genes are identified and isolated, they are usually inserted into a transfer factor. In the process of creating genetically modified crops, the transfer factor is plasmid (a circular DNA molecule) from a soil bacterium Agrobacterium tumefaciens. Therefore, the transfer vector in which the foreign DNA is placed is a biological vector. It is not artificially produced but isolated from the living bacterium.

the answer to this question is B

Extra points for answers Compare the ways in which iron-magnesium minerals and feldspars crystallize from magma

Answers

The comparison of the ways in which iron-magnesium minerals and feldspars crystallize from magma is;

Feldspars continually react with magma and change composition but stay as feldspar whereas iron - magnesium react with magma and change into other minerals.

In Bowen's reaction series, feldspar minerals tend to continually change composition, whereas iron - magnesium minerals tend to have an abrupt change of their mineral types.

Now, the feldspars that are formed from cooling of magnma are usually very rich in calcium. Thus, as cooling continues, the feldspars will start reacting with the magma and as such the feldspar composition will undergo some changes. This reaction will lead to zoned crystals that have outer layers very rich in sodium while the core is very rich in calcium.

For the iron - magnesium minerals, when magma starts to cool, a mineral will now start to crystallize but the more the magma cools the more the temperature drops and a whole new mineral will be formed.

Finally, the minerals formed initially reacts with the magma which makes it to be converted into the new mineral.

Read more at;brainly.com/question/2478481

the magma melts then hardens for a long time then iron magnesium pretty much sugar coats it and crystallizes it.

What would influence a species' physical appearance

Answers

The genes contained in the species' chromosomes would influence a species' physical appearance, would it not?
The alleles that species gains from both parents helps determine what that species physical appearance (also known as the phenotype) would look like.
Hope this explanation helped you. :)

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