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Valentin [98]
3 years ago
12

Cleavage is chick is called discoidal type,why?

Biology
1 answer:
Svetach [21]3 years ago
3 0

Answer; Explanation:

In chicks, the pattern of cleavage is oftentimes referred to as the discoidal because it is entirely associated with the circular disc found in the blastodisc- the cytoplasm. So  when during cleavage process, the cells that arise are known as blastomeres which then collectively form the blastoderm.

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Scurvy is a disease that until the nineteenth century was common among sailors and others whose diets were deficient in vitamin
alina1380 [7]
<h2>Scurvy </h2>

Explanation:

(a) Collagen is the major structural component of cartilage,bones and tendons

  • The basic unit of collagen is tropocollagen and each tropocollagen consists of three coiled left handed polypeptide chains called α chains
  • Generally each α chain consists of a repeating tripeptide sequence called: G-X-Y
  • Here G represents glycine; X represents proline and Y represents hydroxyproline
  • Rigidity of collagen molecule is due to presence of proline and hydroxyproline
  • Hydroxylation of proline is catalysed by prolyl hydroxylase enzyme which use ascorbate,α ketoglutarate and oxygen
  • α ketoglutarate is oxidatively decarboxylated to form carbon dioxide and succinate
  • Sequence of events leading from a dietary vitamin C deficiency to symptoms such as bruising and breakdown of supporting tissues includes: tissue levels of ascorbic acid is low;  enzyme prolyl hydroxylase is inactive;  proline is not hydroxylated;  the triple helix is inadequately stabilized; collagen breaks down;  defects in tissues that depend on collagen ; tissues that depend on collagen are subject to breakdown and bruising

(b) Sailors are no longer susceptible to scurvy because fresh fruits which are the source of vitamin C source are available now

British sailors called "limeys" to this day,this term reflects the British navy's use of limes

5 0
3 years ago
A good model of the cell membrane would be
Elena-2011 [213]

Two pieces of cardboard one located at the bottom and one on top joint by card board with balls at the bottom and top all joint. hope you can picture that, it's rather confusing, sorry.


Hope this helps

4 0
3 years ago
What supplies energy for the water cycle?
VLD [36.1K]

Answer:

The sun!

Explanation:

Brainliest plss

7 0
3 years ago
Read 2 more answers
The x-ray film shows a fracture where one side of the cortex is intact and flexed and the other side has signs of interruption (
zalisa [80]

Answer:

The correct answer is - option B.

Explanation:

Greenstick fractures are the type of fractures where one side of the cortex is intact and flexed while the other side is fractured. This type of fracture known as the incomplete fracture,

If any fracture have two or more lines of fracture it is called as Comminuted fractures. Impacted fractures have one segment on other. Due to the performing same activity again and again stress fracture occures that is characterized by failure of one cortical bone.

Thus, the correct answer is option B.

3 0
3 years ago
Which of the following shows an unsaturated fatty Acid? Out of those two
SVETLANKA909090 [29]

Answer:

None of these two

Explanation:

An unsaturated fatty acid must contain a double bond in the poly carbon chain other than the double bond in the functional group. In these two, images there exists a double bond in the carboxylic group i.e –COOH.  

Since none of them have double bond in long poly carbon chain, therefore these two fatty acids cannot  be considered as unsaturated fatty acid.  

3 0
3 years ago
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