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taurus [48]
3 years ago
6

Which of these occurs first?

Biology
1 answer:
SpyIntel [72]3 years ago
7 0

Answer:

The correct answer is a.  Helicase unwinds DNA

Explanation:

DNA replication is a process in which DNA make it's own copy. There are several enzymes and factors which access the DNA replication process like helicase, primase, SSB protein, DNA polymerase etc.

The first step in DNA replication is the unwinding of double stranded DNA which is accomplished by an enzyme called Helicase. Helicase opens up the double stranded DNA at replication fork by breaking the hydrogen bond between the nucleotides of complementary strands.

This provides a single stranded template for DNA polymerase to form a new complementary strand. In <em>E. coli </em>Dna B is the primary helicase and in humans the primary helicase is MCM( minichromosome maintenance protein complex).

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Place the steps involved in the process of bacterial transformation in the correct order. Drag the labels to the appropriate loc
igomit [66]

Answer:

The flowchart is not seen in your question. The labeling cannot be done without seeing the flowchart.

Here are the processes of bacterial transformation:

Explanation:

Bacterial transformation is defined as the change in the properties of bacteria which is caused by the introduction of foreign and naked DNA.

DNA is an hereditary material in organisms that contains their genetic information.

Here are the processes of bacterial transformation:

Step 1: Donor cell forms a Donor cell lyses

Step 2: Donor cell homologous binds to a receptor site on the recipient cell.

Step 3: One strand of donor cell DNA is degraded, and transformed DNA Pairs with homologous region on recipient cell.

Step 4: Finally, recombines with recipient cell chromosome

7 0
3 years ago
Which organelles helps make and transport proteins and lipids?
Solnce55 [7]

Answer: B. The endoplasmic reticulum

Explanation: GOOGLE

8 0
4 years ago
Why is sickle cell anemia so prevalent in people of African descent?
Lady bird [3.3K]

Answer:

In heterozygotic individuals, the gene for sickle cell anemia is protective against malaria.

Explanation:

Through the same mechanism that the mutation associated with sickle cell anemia produces the disease (altered hemoglobin structure), having a single copy of the mutation (that is, being heterozygotic) provides protection against malaria. This is believed to be due to the altered structure causing difficulty for the malaria parasite when it attempts to enter red blood cells as part of its life cycle.

Today, there are medications to successfully treat malaria, but it still killed 627,000 people in 2020. This represents a significant evolutionary pressure for genes that would prevent serious malarial illnesses. As malaria  was and still is common in African regions, the result was a higher prevalence of sickle cell anemia in those of African descent.

6 0
2 years ago
DO
zloy xaker [14]

Answer:

after examining the diagram of the cell, according to me the OY accurately labels the cytoplasm

6 0
4 years ago
In sleep apnea, how often do victims stop breathing?
TEA [102]
Victims with sleep apnea often stop breathing 20 times per hour.
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3 years ago
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