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3 years ago

Explain how genetic engineers remove sections from human dna for splicing into bacterial dna

2 answers:

5 0

Genetic engineers use the 3 methods of base excision,nucleotide excision and mismatch repair to remove human DNA for use in splicing bacterial DNA.

Hope that helps.

lana66690 [7]3 years ago

4 0

Answer:

The correct answer would be restriction enzymes.

Restriction enzymes refer to the class of enzymes which are involved in cleaving the DNA molecule at or near a particular site which is termed as a restriction site.

Gene of interest and bacterial DNA are treated with the same restriction enzyme (mostly restriction endonuclease) which help in producing sticky ends in the gene of interest as well as bacterial DNA.

The digestion with restriction enzyme helps in removing the gene of interest from other human DNA. In addition, it opens the circular bacterial DNA.

Lastly, the sticky ends help in inserting the gene of interest into the bacterial DNA.

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A second action potential cannot be generated until ________.

Bingel [31]

Answer:

"Action potential is a rapid rise and subsequent fall in voltage or membrane potential across a cellular membrane with a characteristic pattern."

It is the mode through which a neuron transports electrical signals.

Explanation:

Option - (a) is the best choice to choose from,

The refractory period :

A second action potential cannot occur until the membrane has recovered or reestablished, this is the refractory period. The absolute refractory period coincides with inactivation of voltage-gated sodium channels which makes it impossible to generate another nerve impulse.

5 0

3 years ago

Use the drop-down menus and what you know about index fossils to choose the correct answers.

galina1969 [7]

Answer:

1-short

2-order

3-different

Explanation:

i did it :)

4 0

3 years ago

Read 2 more answers

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

During pregnancy, which hormone is responsible for stimulating maturation of the breast for lactation?

vlada-n [284]

That would be prolactin

7 0

3 years ago

True or false the genotype of an organism constitutes its observable characteristics

iren2701 [21]

False

The genotype of an organism does not constitute its observable characteristics but rather its phenotype. A genotype of an organism is the genetic makeup of an organism while the phenotype is the visible characteristics.
It is, however, significant to understand that the phenotype of an organism is as a result of the interaction between the genotype and the environment.

4 0

3 years ago