C. Enzymes increase the rate of the chemical reactions carried out during metabolism.
Answer:
B
Explanation:
RNAi is a cellular mechanism for post-transcriptional gene silencing. After transcription of a gene into mRNA, small interfering RNA (siRNA) and microRNA (miRNA) can target the mRNA to form dsRNA. This mRNA then becomes a target of ribonucleases such as the Dicer that break it apart. These mRNA, therefore, do not reach the cytoplasm for translation by ribosomes. This mechanism is hence harnessed and manipulated by scientists to study genes by silencing them.
Answer:
False
Explanation:
Primers are the small segments of DNA or RNA. Primers do not cleave DNA at specific regions. It is a function of restriction endonucleases. Primers are required during the process of DNA replication as DNA polymerase cannot start the formation of a new DNA strand without preexisting free 3' OH ends. A primer is formed by a primase enzyme. Primers provide the free 3' OH ends to DNA polymerase which in turn extends them to make the new DNA strands. In PCR, primers serve as the same function for the enzyme of DNA strand formation (Taq polymerase).
Answer:
For sediment to become sedimentary rock, it usually undergoes burial, compaction, and cementation