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Flauer [41]
3 years ago
6

Describe the key steps in the semiconservative replication of DNA.

Biology
1 answer:
natka813 [3]3 years ago
7 0

Answer:

Semi-conservative replication is meant for the description of DNA replication and it i s called so because parent DNA helix produces two copies of original DNA, one of which consist of original DNA.

The three main steps in DNA replication includes Initiation, Elongation and Termination.

In the initiation phase, replication begins at origin of replication where helicase enzyme breaks the hydrogen bonds between base pairs and tends to unwind the double helix where the topoisomerase stabilizes the newly formed single strand DNA. DNA polymerase allows elongation to occur in leading direction and catalyses the addition of new nucleotide to new single strands. short sequences of RNA called primers paired to template strands with the help of primase. replication of both strands occurs at the same time one in continuous (3'-5') and other in discontinuous (5'-3') direction, which are called leading strands. new nucleotides added in 3' end and moving to replication fork while discontinuous synthesis occur on parent strand (5'-3') called lagging strand and completed in segments called okazaki fragments. Then primase add primers ahead at 5' end of the lagging strand. DNA  polymerase ||| adds short sequences of nucleotides to the primer. During termination, exonuclease replaces DNA primer and DNA nucleotide and DNA ligase helps in making bonding between fragments and replaced nucleotide. Another exonuclease helps in proofreading the newly formed DNA and corrects the errors in sequences. At the end of the parent strands, telomeres are present which keeps on catalyzing by telomerase and completes, the formation of copies of parent DNA.

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Match each organelle with the correct function.
Arturiano [62]

Answer:

Explanation:

EUKARYOTIC CELL STRUCTURE

Unlike prokaryotic cells, eukaryotic cells have several membrane-bound organelles. The mitochondria convert chemical energy from food into ATP, which is used to power all cell activities. The number of mitochondrion in a cell is determined by the cell's function. Muscle cells require a lot of energy, so they contain many mitochondria. The endoplasmic reticulum (ER) is a packaging and storage facility. Rough ER contains ribosomes and is responsible for protein synthesis. Smooth ER lacks ribosomes. It is responsible for the production and storage of lipids and steroids, as well as the storage of calcium ions. The Golgi body works with the ER to create complex molecules. In animal cells, the Golgi body also creates the lysosomes that break down food and cell waste.

Like animal cells, plant cells have mitochondria, rough and smooth ER, Golgi bodies, nuclei, and cell membranes. Unlike animal cells, plant cells do not have lysosomes. They also contain two unique organelles – cell walls and chloroplasts. The main function of a cell wall is structure and support. The primary job of chloroplasts is photosynthesis. These organelles contain chlorophyll, which traps solar energy. Plant cells also have a large central vacuole that stores water and helps the cell maintain its shape.

7 0
3 years ago
How do the primary productivities of land and ocean ecosystems compare
Sunny_sXe [5.5K]
Welll i really need help plz answer
8 0
3 years ago
What is the purpose of alternative splicing in eukaryotic cells? What is the purpose of alternative splicing in eukaryotic cells
Komok [63]

Answer:

Produce multiple polypeptide sequences from a single primary transcript.

Explanation:

Some genes produce more than one type of protein since the primary transcript encoded by these genes undergoes alternative splicing. These genes mostly have one segment that can serve either as intron or exon. Also called differential splicing, alternative splicing removes the segment as intron but retains it as an exon.

Splicing of the single primary transcript in different ways produces more than one version of mRNA from a single primary transcript encoded by a single gene. The alternative splicing allows the cells to produce multiple types of troponin proteins from single genes. These different troponin regulation muscle contraction in different muscles

6 0
3 years ago
How do yeast reproduce? (1 point)
LUCKY_DIMON [66]
D). Asexually through binary fission

have an amzinging day!

5 0
3 years ago
Read 2 more answers
__________ is sometimes used in late first-stage labor and during delivery in order to block sensation in an area of the body or
ziro4ka [17]

Answer:

Epidural anesthesia is sometimes used in late first-stage labor and during delivery in order to block sensation in an area of the body or to block consciousness

Explanation:

Epidural anesthesia blocks pain in a particular region of the body. The reason for epidural anasthesia is to provide analgesia (pain relief) rather than anesthesia (total lack of feeling). Epidurals is a regional anesthesia that works by blocking the nerve impulses from the lower spinal segments.

The correct answer is epidural anesthesia.

5 0
3 years ago
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