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sammy [17]
2 years ago
5

Why is the human heart cooled for surgery?

Biology
2 answers:
Natalka [10]2 years ago
5 0

Answer:

By cooling the heart, its need for oxygen is reduced. This allows surgeons to work on the heart for two to four hours without damaging the heart tissue.

slavikrds [6]2 years ago
5 0

Answer: By cooling the heart, its need for oxygen is reduced.

Explanation:This allows surgeons to work on the heart for two to four hours without damaging the heart tissue.

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A mutation occurred in the following DNA sequence AGCCTAGCC and the mutated form is now AGCCTTAGCC. Which of the following corre
Ilia_Sergeevich [38]

Answer:

Explanation:

1.A deletion mutation occurs when a wrinkle forms on the DNA template strand and subsequently causes a nucleotide to be omitted from the replicated strand.

2.This type of variant results in a shortened protein that may function improperly, be nonfunctional, or get broken down. An insertion changes the DNA sequence by adding one or more nucleotides to the gene.

3. A substitution mutation can cause the following: Change in the coding of amino acids codon to a particular stop codon resulting in an incomplete protein, which is usually non-functional. Can cause Silent mutations where a codon change can encode the same amino acid resulting in no changes in the protein synthesized.

4. when a premature nonsense or stop codon is introduced in the DNA sequence. When the mutated sequence is translated into a protein, the resulting protein is incomplete and shorter than normal. Consequently, most nonsense mutations result in nonfunctional proteins.

3 0
3 years ago
⚠️This is Multiple choice⚠️
snow_lady [41]

Answer:

Molecules can be made of one type of element pr a mixture of element.

Molecule is two or more atoms bonded together.

Compound act like a different substance (because have different properties from its constituent elements).

Explanation:

A molecule is the combination of one or more atoms. These atoms may be from different elements are of the same elements. All the compounds are molecule but not all the molecules are compound. For example,

H₂O is a water molecule and also a compound. H₂ is just a molecule not a compound because both atoms are from same element.

The compound have different properties from its constituent elements. e.g water is compound made up of hydrogen and oxygen. Hydrogen is flammable gas and oxygen support combustion, while water doesn't have these properties. However in mixture elements retain their own properties that's why mixture is different from the compound.

8 0
3 years ago
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9. Knowing what you know about how a substance travels in
Romashka-Z-Leto [24]

Answer:

Higher

Explanation:

Molecules such as oxygen move from a higher concentration to a lower concentration across a semi-permeable membrane. This process is called simple diffusion.

Therefore, for oxygen to leave the alveoli and enter the blood, there would need to be a higher concentration of oxygen inside the alveoli and a lower concentration of oxygen in the blood.

6 0
3 years ago
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The correct answer is: daughter cells will have abnormal chromosome numbers and this condition is called aneuploidy.

Nondisjunction is the failure of homologous chromosomes (or sister chromatids) to separate during the process of cell division and consequently lead to aneuploidy. There are three forms of nondisjunction:  

• Nondisjunction in meiosis I (pair of homologous chromosomes unable to separate in meiosis I),  

• Nondisjunction in meiosis I (sister chromatids unable to separate during meiosis II), and

•  Nondisjunction in mitosis (failure of sister chromatids to separate during mitosis)


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3 years ago
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What is one bioethical concern with using embryonic stem cells for regenerative medicine?
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<span>a)Stem cells must always be provided by a donor who is financially compensated.</span>
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