milkshakegrande101

19.10.2021 • 

Biology

By definition, temperature-sensitive (ts) Sec mutants accumulate a full-length GFP-fusion secretory protein at an intermediate location in the secretory pathway when cells are incubated at the non-permissive temperature. The entire GFP-fusion protein must be synthesized in order for you to visualize it. Any mutation that prevents synthesis of the entire protein will not be detected in a Sec mutant screen because there is nothing to see. With this in mind, which of the following three P54SRP ts mutants would generate a Class A Sec phenotype at the non-permissive temperature? A. ts P54SRP does not bind to the N-terminal signal sequence at the non-permissive temperature.
B. ts P54SRP cannot hydrolyze GTP at the non-permissive temperature.
C. ts P54SRP cannot bind to the SRP receptor α subunit at the non-permissive temperature.
D. Both (a) and (b) would generate a Sec A phenotype.
E. Both (a) and (c) would generate a Sec A phenotype.
F. Both (b) and (c) would generate a Sec A phenotype.

Ответ:

alfonso2382

15.05.2022

Biology

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Answer;

They fused into Pangaea

By the close of the paleozoic era all the continents fused into Pangaea.

Explanation;

Paleozoic era is the era of "ancient life".

During the early Paleozoic era, South America, Africa, Australia, Antarctica, India, and perhaps China comprised the vast southern continent of Gondwana.

At the beginning of this period, all continents joined together to form the supercontinent Pangaea, which was encircled by one ocean called Panthalassa.

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