Why are DNA primers an important ingredient in a PCR reaction?
Select all that apply
a) DNA polymerase cannot start to copy a DNA molecule without a single-stranded starting point.
b) DNA polymerase cannot start to copy a DNA molecule without a double-stranded starting point.
c) Primers create a single-stranded section of DNA.
d) Primers create a double-stranded section of DNA.

answer: blah

explanation:

bc blah

volcanoes (an event in the geosphere) release a large amount of particulate matter into the atmosphere. these particles serve as nuclei for the formation of water droplets (hydrosphere). rainfall (hydrosphere) often increases following an eruption, stimulating plant growth (biosphere).

answer: although many types of viruses can cause a common cold, rhinoviruses are the most common culprit. a cold virus enters your body through your mouth, eyes or nose. the virus can spread through droplets in the air when someone who is sick coughs, sneezes or talks. theres your answer

explanation: