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blagie [28]
2 years ago
6

MULTIPLE CHOICE

Biology
1 answer:
mario62 [17]2 years ago
4 0
D.) A secondary pollutant caused by a chemical reaction between pollutants and light.
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What you observe when examining the onion root tip using the low-power lens
bezimeni [28]

Explanation:

Low power objective shows more field of view but does not give appreciable details about the view.

  • In the root tip of onions, the cell walls are distinctly visible and they are arranged in a rectangular mosaic pattern.
  • The nucleus stands out appreciably and it is tiny.
  • The cytoplasm is also visible.
  • Root cells do not have chloroplast since they do not take part in photosynthesis.

Learn more:

Onion cell brainly.com/question/2855039

#learnwithBrainly

4 0
3 years ago
The y-shaped site at which a double-stranded molecule of dna is separated into two single strands for replication.
aleksandrvk [35]

The Y shaped structure with active region present is called replication fork

The separation of the 2 single strands of DNA creates a ‘Y’ form referred to as a replication ‘fork’. the 2 separated strands will act as templates for making the new strands of DNA.

LEADING STRAND

one of the strands is oriented in the 3’ to 5’ path (toward the replication fork), this is the main strand?. the other strand is oriented inside the 5’ to 3’ direction (away from the replication fork), that is the lagging strand?.

because of their extraordinary orientations, the 2 strands are replicated in a different way: A small piece of RNA called a primer (produced by means of an enzyme referred to as primase) comes along and binds to the end of the leading strand. The primer acts as the place to begin for DNA synthesis.

DNA polymerase? binds to the leading strand after which ‘walks’ alongside it, including new complementary? nucleotide? bases (A, C, G and T) to the strand of DNA within the 5’ to 3’ direction.

This form of replication is referred to as continuous

LAGGING STRAND

Several RNA primers are made by means of the primase enzyme and bind at numerous points alongside the lagging strand.

Chunks of DNA, known as Okazaki fragments, are then introduced to the lagging strand also in the five’ to a few’ path.

This sort of replication is known as discontinuous as the Okazaki fragments will want to be joined up later.

Once all the bases are matched up (A with T, C with G), an enzyme referred to as exonuclease strips away the primer(s). The gaps wherein the primer(s) were are then filled by but extra complementary nucleotides.

The brand new strand is proofread to make sure there are no errors inside the new DNA series.

eventually, an enzyme referred to as DNA ligase? seals up the sequence of DNA into two non-stop double strands.

The end result of DNA replication is two DNA molecules consisting of 1 new and one old chain of nucleotides. That is why DNA replication is described as semi-conservative, 1/2 of the chain is part of the unique DNA molecule, half is ultra-modern.

Following replication the brand new DNA routinely finishes up into a double helix.

To know more about DNA replication click here

brainly.com/question/21265857

#SPJ4

7 0
1 year ago
It's pretty easy, please help, I'm confused on it.
omeli [17]

Answer:

above fossils and fossil fuels is 6

above the sheep is 4

above the tree on the right is 1

above the tree on the left is 3

above the city is 5

Explanation:

brainliestttt

8 0
2 years ago
Which type of mutation causes this translation error that leads to cystic fibrosis? silent missense nonsense deletion
aliya0001 [1]

Answer:

The type of mutation that causes this translation error is called deletion. Deletion occurs when a section of a DNA is deleted or lost. In cystic fibrosis, three nucleotides are deleted that results in the lost of phenylalanine.

Explanation:

8 0
3 years ago
Another feature of being alive is a very high level of
Gala2k [10]
Blood circulating in your body.
4 0
3 years ago
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