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Andrei [34K]
3 years ago
15

Due in great part to its characteristic of having a fixed number of cells in the adult, Caenorhabditis elegans has become an imp

ortant model research organism in developmental biology. To which phylum does C. elegans belong?
Platyhelminthes


Annelida


Arthropoda


Nemertea


Nematoda
Biology
1 answer:
Lana71 [14]3 years ago
6 0

Answer:

Phylum Nematoda

Explanation:

<u>Caenorhabditis.elegans</u> is a free-living transparent nematode about 1 mm in length.

C. elegans is a nematode—a member of the phylum Nematoda:

<u>Nematoda.</u>

The roundworms and threadworms, a phylum of smooth-skinned, unsegmented worms with a long cylindrical body shape tapered at the ends; includes free-living and parasitic forms both aquatic and terrestrial.

<u>C.</u> <u>elegans</u> is a non-hazardous, non-infectious, non-pathogenic, non-parasitic organism.  It is small, growing to about 1 mm in length, and lives in the soil—especially rotting vegetation—in many parts of the world, where it survives by feeding on microbes such as bacteria. It is of no economic importance to man.

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garri49 [273]

Answer:

1. The difference between the normal hemoglobin protein DNA sequence and the sickle cell hemoglobin DNA sequence is a base to base shift, in this case adenine (GAG) to thymine (GTG).

2. The difference affects the amino acid sequence of the protein by replacing glutamic acid (Glu) with valine (Val).

Explanation:

In sickle cell anemia, a change in the DNA nucleotide sequence is observed, where adenine is substituted by thymine, whose expression is the change in the amino acid sequence of globine β, incorporating valine instead of glutamic acid. This represents a molecular mutation - point mutation - by subtitution, which corresponds to missense mutation.

<u>Normal hemoglobin protein in a RBC</u>

DNA                 CTG ACT CCT GAG GAG AAG TCT

Amino acids     Leu  Thr   Pro   Glu   Glu   Lys   Ser

<u>Sickle cell hemoglobin protein in a RBC</u>

DNA                 CTG ACT CCT <em>GTG</em> GAG AAG TCT

Amino acids     Leu  Thr   Pro   <em>Val</em>   Glu   Lys   Ser

When GAG is transcribed to mRNA, the CUC codon is obtained, which codes for glutamic acid. Thymine substitution causes the DNA sequence to change to GTG, which is transcribed as CAC, the codon that encodes the amino acid valine. The <u>change from glutamic acid to valine in β-globin causes an altered hemoglobin, giving the abnormal erythrocytes observed in sickle cell disease</u>.

6 0
3 years ago
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Answer:

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4. Temperature fluctuation

5. Sahara

6. Desert pavement

7. Adaption

8. Water loss

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6 0
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marta [7]
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2 years ago
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Answer:

The answer to your question: Pressure will decrease

Explanation:

Data

P1 = 5 atm

T1 = 254.5 K

T2 = 101.8 K

P2 = ?

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