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3 years ago

Can somebody give me the answer for these...

Biology

1 answer:

labwork [276]3 years ago

4 0

Answer:

1. Life cycle of a cell starts from

G1 phase - S phase (synthesise phase) - G2 phase - mitosis.

2. By mitosis bcoz it restore nucleo cytoplasmic ratio means ploidy of cell remain same.

3. Bcoz of transformation of normal cells into cancerous cells by Carcinogens present in tobacco.,drugs .etc

4 mitosis occurs in plants animals

Binary fission occurs in bacteria and other single celled organism.

Both give rise to two daughter cells.

5.sex cells (n) are produced by meiosis from gamete mother cells(2n).

6.in meiosis ploidy of cell become half

Means diploid cell form haploid cells

And 4 haploid daughters cells are formed.

In mitosis, ploidy of cell remain same

Means haploid form haploid and diploid form diploid.

1 cell form 2 daughter cells.

Hope this helps you.. Frnd ❤️

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Please help its due in a hour!!!!!

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.

Normal hemoglobin protein in a RBC

DNA CTG ACT CCT GAG GAG AAG TCT

Amino acids Leu Thr Pro Glu Glu Lys Ser

Sickle cell hemoglobin protein in a RBC

DNA CTG ACT CCT GTG GAG AAG TCT

Amino acids Leu Thr Pro Val 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 change from glutamic acid to valine in β-globin causes an altered hemoglobin, giving the abnormal erythrocytes observed in sickle cell disease.

6 0

3 years ago

Which disorder, diagnosed in the 1800s, was believed to be caused by a woman experiencing "wandering movements of the womb"?

HACTEHA [7]

A 2nd-century hysteria was caused by the belief that the uterus could move freely within the body in search of fluid and cause specific symptoms depending on the areas the uterus was displaced to. Called the wandering womb disorder, the womb was believed to be a living thing within a living thing.

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3 years ago

John wants to conduct an experiment to determine why his bedroom is 1 point

sergiy2304 [10]

Answer:

Explanation:

8 0

3 years ago

Answer this question What does Plato mean when he says education should be a cure?

Setler [38]

Answer:

Plato believes that education is an attempt to cure a mental illness instead of using a medicine. he believes that this will help bring out their talents instead of keeping them inside.

Explanation:

7 0

2 years ago

Classify each statement as an example of adhesion, cohesion, or surface tension. Drag each statement to the appropriate bin. A s

LekaFEV [45]

Answer:

A sewing needle floats when it is placed gently on top of water in a bucket - surface tension

Water molecules ding to plant cell walls - adhesion

A water strider runs across a pond without breaking the surface - surface tension

A drop of water spilled on a table forms a drop on the table, rather than spreading out over the surface - cohesion

Water molecules cling to the side of a beaker - adhesion

Water molecules are attracted to each other - cohesion

Explanation:

The surface tension refers to the tendency of the surface of a liquid to remain unbroken by an external force due to the cohesive property of the molecules of the liquid. Instead of being broken, the surface of the liquid stretches like an elastic membrane.

The adhesive property of a liquid, also known as the force of adhesion, refers to the property of the molecules of the liquid to stick to other molecules while cohesive property or cohesion refers to the property of molecules of liquids to stick to themselves.

Hence,

Surface tension

A sewing needle floats when it is placed gently on top of water in a bucket.
A water strider runs across a pond without breaking the surface.

Cohesion

A drop of water spilled on a table forms a drop on the table, rather than spreading out over the surface.
Water molecules are attracted to each other.

Adhesion

Water molecules ding to plant cell walls
Water molecules cling to the side of a beaker

8 0

3 years ago