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lora16 [44]
3 years ago
7

Can you explain why DNA must be replicated before mitosis and the role of helicase in DNA replication

Biology
2 answers:
kipiarov [429]3 years ago
4 0

Answer:

1. dna needs to be replicated before mitosis so that the parent cell has the same amount of genetic material as the parent cell once it has split.

2. helicase is an enzyme that is so dna can unwind.

Explanation:

the explanation is in the answer.

I hope this helps!

iogann1982 [59]3 years ago
3 0

Answer:

DNA must be replicated before mitosis so that both identical daughter cells contain the same amount of genetic material as the parent cell once it has split in two. Helicase is an enzyme necessary at the initiation of DNA replication to unwind/unzip the DNA so that this process may begin.

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Describe the flow of blood from the umbilical vein to the descending aorta in the developing fetus.
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A small amount of the blood continues on to the lungs. Most of this blood is shunted through the ductus arteriosus to the descending aorta. This blood then enters the umbilical arteries and flows into the placenta. The oxygen rich blood then returns to the fetus via the third vessel in the umbilical cord (umbilical vein). The oxygen rich blood that enters the fetus passes through the fetal liver and enters the right side of the heart.

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3 years ago
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During respiration, most ATP is formed as a direct result of the net movement of potassium against a concentration gradient pota
Fantom [35]

Answer:

b. False

Explanation:

All living organisms such as plants and animals require energy to function properly (life activities). Thus, the organelle where energy from nutrients is released is generally referred to as mitochondria. Animals retrieve energy using mitochondria to do cellular respiration because they typically act like a digestive system by taking in nutrients, breaking them down and obtaining energy rich molecules for cell-life activities.

Cellular respiration can be defined as a series of metabolic reactions that typically occur in cells so as to produce energy in the form of adenosine triphosphate (ATP). During cellular respiration, high energy intermediates are created that can then be oxidized to make adenosine triphosphate (ATP). These intermediary products are produced at the glycolysis and citric acid cycle stage.

Basically, mitochondria is one of the cell organelles found in all living organisms and it is known as the powerhouse. Therefore, mitochondria provides all the energy required in the cell by transforming energy forms through series of chemical reactions; breaking down of glucose into Adenosine Triphosphate (ATP) used for providing energy for cellular activities in the body of living organisms.

Hence, during respiration, most ATP is formed as a direct result of the net movement of protons down a concentration gradient but not potassium against a concentration gradient potassium.

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3 years ago
How should tame animals be moved ?
Rama09 [41]

Answer:

It depends on the animal(s)

Explanation:

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