Answer:
A=4
B=1
C=3
D=2
Explanation:
hope this helps you to understand now :)
Going to be B. The others talk about seasons. As for B talks about one day weather.
Answer:
Sea shell fossils are found in a mountain-top cave in New Hampshire.
Explanation:
Answer:
Contamination of the control sample (negative control) with DNA
Explanation:
The Polymerase Chain Reaction (PCR) is a technique widely used in molecular biology laboratories to amplify a target DNA fragment using primer pairs and DNA polymerase. In PCR experiments, it is imperative to include both positive and negative controls. The positive control refers to the amplification of a PCR product (amplicon) of known molecular size during PCR reaction in order to ensure the correct molecular weight of the target DNA fragment. The negative control refers to the inclusion of a sample without DNA in order to ensure that no contamination with DNA has occurred in the other samples.
