Answer:
The Middle Image
Explanation:
A cast fossil preserves the impression of the hard parts of an organism, such as a shell or exoskeleton.
The population of producers would get larger as nothing would be eating them anymore.
The 1st one is plasma membrane because it is the outside
the 2nd one is the cytoplasm because it is the middle part
the 3rd one is the nucleus because it is the center
p.s. I need brainliest i'm gonna lose a rank because i havent got enough brainliests
Answer:
either deoxyribose or ribose
Explanation:
i can't see the diagram, but-
- if the diagram shows a single stranded chain of rna, then the answer is ribose
- if the diagram shows a double stranded chain of dna, then the answer is deoxyribose
- uracil and thymine are nucleic acids, not sugars/carbohydrates
When you start the PCR amplification reaction, you have a template which has sequences where the primers will anneal. The forward primer anneals in the sense strand and the reverse one in the complementary sequence (see attached figure).
After the first PCR cycle, two types of fragments are obtained. First those which come from tha 5'-3' sequence, that are 3'-5' and will anneal the reverse primer in the following cycle. This fragments have the correct 3' end, but the 5' includes part of the template that doesn't correspond to our target (see attached figure)
Second, those fragments that come from the 3'-5' sequence, that are 5'-3' and will anneal the forward primer. This fragments also have the correct 3' end, but the 5' includes part of the template that doesn't correspond to our target (see attached figure).
Now, during the second cycle, are produced the first fragments that have the precise length of the sequence that we want to amplify (see attached figure).
So, it's not until the third cycle that the reaction starts amplifying exactly the sequence of desired length.