Answer:
<h3>
<u>mutualistic</u> is the correct answer.</h3>
Site-specific recombination systems all of the choices are correct i.e.
A. do not depend on extensive nucleotide sequence homology.
B. depend on enzymes that are often specific for sequences within the host.
C. are features of some viruses.
- An exchange between two specified sequences (target sites), either on the same DNA molecule or on two separate DNA molecules, is known as site-specific recombination.
- DNA sequences may be integrated, excised, or inverted as a result of the exchange.
- A site-specific recombinase that can work by itself or with the aid of additional components or enzymes shapes the DNA target during recombination.
- The recombinase is chemically bonded to the ends of the intermediate DNA after DNA breakage at the recombination site; when this process is reversed, the intermediate DNA is resealed to form the recombinant and the recombinase is released.
- During this recombination process, neither replication nor repair are necessary.
learn more about Site-specific recombination here: brainly.com/question/11458760
#SPJ4
Answer:
D, Flagella
Explanation:
Ribosomes produce proteins for the cells to function, chloroplasts provide a plant cell with photosynthesis, vacuoles provide a plant cell with holding its structure up, and mitchondria provides ATP (energy) for the cell to function.
D=misreading the instrument
Many of the factors that led to the late Permian mass extinction also contributed to the late Cretaceous mass extinction, with the exception of a meteor strike.
<h3>Permian-Triassic extinction</h3>
The biggest mass extinction event in Earth's history occurred about 250 million years ago and wiped out 96% of marine life and 70% of land life. Known as "the great death", it was a period of extreme volcanism on the planet, in the region of Siberia.
<h3>Cretaceous-Paleogene extinction</h3>
Occurred only 66 million years ago, it decimated 75% of species. All non-avian dinosaurs were killed. Unlike the previous ones, this event was caused by an external agent: an asteroid over 13 kilometers wide plunged into Earth at 72,000 kilometers per hour.
Whit this information, we can conclude that many of the factors that led to the late Permian mass extinction also contributed to the late Cretaceous mass extinction, with the exception of a meteor strike.
Learn more about Permian in brainly.com/question/4290693
