Which of these is necessary for only the FIRST step of PCR?

a) the four DNA nucleotides

b) DNA primers

c) original template DNA

d) DNA polymerase

e) All of these choices are correct.

Which type of transport takes place when a protein allows an ion to enter a cell without using energy?

What organelles would have a similar function to a furnace that burn fuel to realise energy. A. cell membrane B. nucleus C. Mitochondria D. ribosome

Which of the following contribute to bacteria's large diversity? small size ability to reproduce quickly diverse habitats all of the above

What kind of genetic variation in happy-face spiders was dr. gillespie studying?

Which statement illustrates how human activities can most directly change the dynamic equilibrium of an ecosystem? Water pollution causes a decrease in fish populations in a river. A hurricane causes a stream to overflow its banks.

If a mother carries a recessive allele for a genetic disorder such as cystic fibrosis under what circumstances will her children inherit the disorder

Explain how compaction is important in the formation of coal

Aristotle was a true scientist

What are the four major ocean basins? Are these basins connected?

Why is cellular respiration considered an efficient process