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Shtirlitz [24]
3 years ago
14

Which is the pair of the enzyme activities most significantly affected by glucagon- and insulin-dependent phosphorylation and de

phosphorylation of 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase (PFKFB)?
a. hexokinas ::::: glucose-6-phosphatase
b. phosphofructokinase ::::: Fructose-1,6-bisphosphatase
c. pyruvate kinase :::::: pyruvate carboxylase
d. glycogen synthase ::::: glycogen phosphorylase
e. None of these
Biology
1 answer:
prisoha [69]3 years ago
3 0

Answer:

b. Phosphofructokinase;  Fructose-1,6-bisphosphatase

Explanation:

Glucagon is a hormone which functions to initiate gluconeogenesis whwreas insulin functions to initiate glycolysis.

Fructose-2,6-bisphosphate (F26BP) is an allosteric regulator of the <em>glycolytic and gluconeogenic enzymes phosphofructokinase-1 (PFK-1) and fructose-1,6-bisphosphatase (FBPase-1).</em>

It stimulates glycolysis and inhibits gluconeogenesis by binding to its allosteric site on phosphofructokinase-1 reducing its affinity for the allosteric inhibitors ATP and citrate .

It is formed by phosphorylation of fructose-6-phosphate catalyzed by  <em>phosphofructokinase-2</em> and is broken down by <em>fructose-2,6-bisphosphatase </em>which are two separate enzymatic activities of a single, bifunctional protein (PFK-2/FBPase-2).

Phosphorylation of PFK-2/FBPase-2 due to glucagon release enhances its FBPase-2 activity thereby stimulating gluconeogenesis and inhibiting glycolysis.

Dephosphsorylation of PFK-2/FBPase-2 due to insulin release enhances its PFK-2 activity, thereby stimulating glycolysis and inhibiting gluconeogenesis.

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The source of passive immunity that a mother gives to her infant through breast milk is known as __________.
maks197457 [2]

Answer:

The correct answer is- IgA

Explanation:

There are five types or class of antibodies found in the human body these are IgA, IgM, IgD, IgE, and IgG. Out of these five class IgA antibody is found in an abundant amount in the mother's milk or colostrum.

Infant take this antibody from the mother through breastfeeding which protects the infant from may pathogenic microbes. The immunity in which antibodies are taken from outside is called passive immunity.

Therefore the passive immunity source that is given by the mother to baby through breast milk is called IgA.

3 0
2 years ago
In beans the pod texture and growth form genes are located on different chromosomes. There are two varieties of beans in a farme
irina1246 [14]

Answer:

a. Genotype in F1 - TtBb

   Phenotype in F1 - tough pods, bush-type growth

b. Proportion of F2 that are heterozygous for bush-type growth form = 5/8

c. Proportion of the F2 with tender pods =  1/4

d. Proportion of F2 that are heterozygous for growth form and have tender     pods = 1/8

Explanation:

Since the two traits are located on different chromosomes, they will independently assort during gametes formation. T is dominant over t and B is dominant over b.

Two true-breeding varieties were crossed at the beginning of the program:

TTBB   x   ttbb

All F1 plants will have the genotype TtBb with tough pods and bush-type growth form.

Advancing the cross to F2:

TtBb   x   TtBb

Progeny

1 TTBB   -   tough pods, bush-type

2 TTBb     -  tough pods, bush-type

2 TtBB    -   tough pods, bush-type

4 TtBb     -   tough pods, bush-type

1 TTbb     -    tough pods, climbing-type

2 Ttbb     -    tough pods, climbing-type

1 ttBB       -    tender pods, bush-type

2 ttBb     -      tender pods, bush-type

1 ttbb      -      tender pods, climbing-type

<em>Proportion of F2 that are heterozygous for bush-type growth form = 10/16 = 5/8</em>

<em>Proportion of the F2 with tender pods = 4/16 = 1/4</em>

<em>Proportion of F2 that are heterozygous for growth form and have tender pods = 2/16 = 1/8</em>

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3 years ago
Which arthropods spread by using book lungs?
kenny6666 [7]

Answer:

scorpions and spiders

Explanation:

4 0
2 years ago
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During DNA replication, which nucleotide will bind to an A nucleotide in the original or parental DNA strand?
Volgvan

Answer: nucleotide A will bind to nucleotide T during DNA replication.

Explanation:

In DNA replication, Adenine(A) pairs up with its complementary base Thymine(T). The DNA polymerase which is an enzyme ensures that the nucleotide with base T binds to the base A of parental nucleotide.

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In the human heart the muscular structure of the ventricles enables them to
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They help pump blood at a greater distance than Atria can.
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