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Dimas [21]
3 years ago
14

What effect do producers have on a food chain?

Biology
1 answer:
Arada [10]3 years ago
7 0

Answer:

Producers are the foundation of a food chain.

Explanation:

They provide energy for all of the consumers in an ecosystem.

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Which statements are true regarding blood pressure in older adults? Select all that apply?
navik [9.2K]
High BP above 39 to 79 age
5 0
3 years ago
What is the point of DNA replication​
Degger [83]

Answer:

DNA replication is the process by which a double-stranded DNA molecule is copied to produce two identical DNA molecules. Replication is an essential process because, whenever a cell divides, the two new daughter cells must contain the same genetic information, or DNA, as the parent cell

Explanation:

DNA replication is the biological process in which two identical copies of DNA are produced from one original DNA molecule.

The steps involved in the process of DNA replication are as follows:

The first step in DNA replication is to ‘unzip’ the double-helix structure of the DNA molecule.

This is carried out by an enzyme called helicase which breaks the hydrogen bonds holding the complementary bases of DNA together (A with T, C with G).

The separation of the two single strands of DNA creates a ‘Y’ shape called a replication ‘fork’. The two separated strands will act as templates for making the new strands of DNA.

One of the strands is oriented in the 3’ to 5’ direction (towards the replication fork), this is the leading strand. The other strand is oriented in the 5’ to 3’ direction (away from the replication fork), this is the lagging strand. As a result of their different orientations, the two strands are replicated differently.

A short piece of RNA called a primer (produced by an enzyme called primase) comes along and binds to the end of the leading strand. The primer acts as the starting point for DNA synthesis. DNA polymerase binds to the leading strand and then ‘walks’ along it, adding new complementary nucleotide bases (A, C, G and T) to the strand of DNA in the 5’ to 3’ direction. This replication is continuous. Numerous RNA primers are made by the primase enzyme and bind at various points along the lagging strand.

Chunks of DNA, called Okazaki fragments, are then added to the lagging strand also in the 5’ to 3’ direction. This type of replication is called discontinuous as the Okazaki fragments are joined up later.

Once all of the bases are matched  (A with T, C with G) an enzyme called exonuclease strips away the primer(s).

The new strand is proofread to make sure there are no mistakes in the new DNA sequence.

Finally, an enzyme called DNA ligase seals up the sequence of DNA into two continuous double strands.

The result of DNA replication is two DNA molecules consisting of one new and one old chain of nucleotides. This is why DNA replication is described as semi-conservative, half of the chain is part of the original DNA molecule, half is brand new.

Following replication, the new DNA automatically winds up into a double helix

(b) DNA replication occurs in S phase of cell cycle in eukaryotes. If cell division is not followed after DNA replication then the replicated chromosomes (DNA) would not be distributed to daughter nuclei. A repeated replication of DNA without any cell division results in the accumulation of DNA inside the cell nucleus, leading to polyploidy.

7 0
2 years ago
What factors influence the input and output of carbon through Earth's spheres? The oceans on Earth act as carbon sinks.
Dvinal [7]

The oceans on earth act as carbon sinks

the combustion of fossil fuels

atmospheric carbon dioxide is continuosly exchanged

vegetation and soil take in more co2 than they release

3 0
2 years ago
In bacteriophage lambda, the choice between the lytic and lysogenic pathways is often thought of as a sort of race between the p
Pie
What pathway would likely predominate in a mutant in which ci was overexpressed relative to a wild-type virus? - Lytic pathway; when the virus infects the cell, that is, it gets into it, clones or forms thousands of viruses and then breaks the capsid and continues parasitizing other cells to follow the same procedure.<span>in a mutant in which ci was underexpressed relative to a wild-type virus?</span> Lysogenic; that is when the genetic material of the virus is coupled to the genetic material of the cell, then the cells b, daughters of this, will be possessors of the virus (genetically).
4 0
2 years ago
What conclusion can you draw from the population pyramid?
lana [24]

Answer:

I believe it's birth rates r high because if it's it's narrow at the top it's high death and if it's wide at bottom it's high birth rates if I'm wrong I'm sorry

Explanation:

7 0
3 years ago
Read 2 more answers
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