<span>A similarity between humans and many other multicellular animals is that they are composed of organ systems. All multicellular organisms, including humans, must have organ systems to survive and function. </span>
Answer:
The Lac repressor is preventing genes being expressed most of the time.
Explanation:
The Lac repressor protein, LacI, prevents the transcription of genes involved in lactose utilization.
Answer:
collision between the Indian Plate and Eurasian Plate
Explanation:
Answer:
D
Explanation:
Key points:
- Cells have a variety of mechanisms to prevent mutations, or permanent changes in DNA sequence.
- During DNA synthesis, most DNA polymerases "check their work," fixing the majority of mispaired bases in a process called proofreading.
- Immediately after DNA synthesis, any remaining mispaired bases can be detected and replaced in a process called mismatch repair.
- If DNA gets damaged, it can be repaired by various mechanisms, including chemical reversal, excision repair, and double-stranded break repair.
that's from khan academy^
