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Stels [109]
3 years ago
6

Please help me. i’m confused and don’t know the answer

Biology
1 answer:
Cerrena [4.2K]3 years ago
3 0

Answer: The correct answer is C: decreased use of fossil fuels.

Explanation: The burning of fossil fuels causes the release of CO2 and other harmful substances into the atmosphere. Fossil fuels are fuels that are burnt by power plants and such to generate power.

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Why can't both strands of DNA be replicated at the same time?
saw5 [17]

Answer: DNA is a molecule made up of two strands, twisted around each other in a double helix shape. The two strands are complementary which have a 5 prime end and a 3 prime end. To understand this question you must first understand the steps that follow.

DNA Replication:

<u>Step one: </u>

DNA Helicase (unzips) separates the strands.

<u>Step two:</u>

DNA Primase starts the process and makes a small piece of RNA called a primer. This marks the starting point for the DNA.

<u>Step three:</u>

DNA Polymerase binds to the primer and will make the new strand of DNA. DNA Polymerase can only add DNA bases in one direction, from the 5 prime end to the 3 prime end.

  • The leading strand is made continuously.
  • The lagging strand does not run continuously because it runs in the opposite direction. Each fragment is started with an RNA primer. DNA Polymerase then adds a short row of DNA bases from the 5 prime to 3 prime direction. This results in okazaki fragments because it can only replicate in small chunks. The process is repeated.

<u>Step four:</u>

Once the new DNA is complete the enzyme exonuclease removes all the RNA primers from both strands of DNA.

<u>Step five:</u>

Another DNA Polymerase fills in the gaps that are left behind with DNA.

<u>Step six:</u>

DNA Ligase seals up the fragments in DNA, in both strands to make a continuous double strand.

<u>Final answer:</u>

DNA Replication cannot replicate at the same time due to the leading and lagging strand.

Good luck!

7 0
3 years ago
1. What are the 5 requirements for a mineral to be a mineral?<br><br> 2. What are rocks made of?
svlad2 [7]

Answer:

simple answer for question 2

Explanation:

rocks are composed of grains from minerals,

8 0
3 years ago
Which descriptions accurately apply to vascular plants? Check all that apply.
atroni [7]

Answer: have true roots, stems, and leaves

may have seeds

may not have seeds

have vascular tissue

Explanation:

some vascular plants have seeds and some do not.

they have vascular tissue such as xylem and phloem

they have true roots, stems, and leaves

6 0
3 years ago
Read 2 more answers
Which microscope uses a series of lenses to magnify an object in steps?
babymother [125]
It's Optical microscope
5 0
3 years ago
Yo can someone help me out
klasskru [66]

Answer:

Pretty sure its A, and if its not, i'm sorry its 10 a.m and i'm still half asleep.^O^

4 0
3 years ago
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