The plasma membrane and several cytoplasmic organelles such as the ER, Golgi apparatus, secretory granules and vesicles, lysosomes, endosomes, form an endomembrane system.
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<span>Methyl groups
</span>DNA<span> methylation is a process by which </span>methyl groups<span> are added to the </span>DNA<span> molecule. Methylation can change the activity of a </span>DNA<span> segment without changing the sequence.</span>
Answer: Which is the BEST explanation for the drastic decrease in the number of dolphins killed after 1975?
A Tuna fishing was banned in 1975.
B. Dolphins stopped swimming with tuna.
C. Economic and political pressures were brought against tuna fishermen.
D. Dolphin deaths and tuna catches were not considered important after 1975.
Explanation: Improvements in fishing gear and techniques discussed in Chapter 7, the mandatory observer program, and the kill quota were responsible for the dramatic decline in the number of dolphins killed by boats in the U.S. fleet.
Lysogeny<span> ly·sog·e·ny (lī-sŏj'ə-nē) n. The fusion of the nucleic acid of a bacteriophage with that of a host bacterium so that the potential exists for the newly integrated genetic material to be transmitted to daughter cells at each subsequent cell division.</span>
Answer and Explanation:
A restriction enzyme is a type of endonuclease enzyme that recognizes a specific short nucleotide sequences on the DNA and cuts the DNA only at palindromic sites. There are different types of restriction enzymes:
1. Type I restriction enzyme – It cuts at sites far from the recognition site and requires both ATP and S-adenosyl- L-methionine as cofactor to function.
2. Type II restriction enzymes – It cleaves at short-specific distances from the recognition site and mostly requires magnesium to function.
3. Type III restriction enzymes – It recognizes two separate non-palindromic sites and cleaves at 20–30 base pairs away from a recognition site. It requires both ATP and S-adenosyl-L-methionine .
The restriction enzymes cleave DNA sequences producing either sticky or blunt ends that can be ligated with other sequences.