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Annette [7]
3 years ago
10

What special features of adaptations do each of these organisms living in the rocky shore have which enable to survive this type

of environment?
Seaweeds (4)
Limpet (4)
Barnacle (4)
Crab (4)
Lichen (4)
Sea Squirts
Biology
1 answer:
Bess [88]3 years ago
7 0
<span>what kinds of adaptations do they have that enable them to survive the pounding waves while staying in place, tidal changes (periods of time covered with water or periods of time with no water), sunlight exposure, evaporation of water that may leave concentrated salts behind, blending in to avoid predators</span>
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Which model of replication did the actual results of the Meselson-Stahl experiment support? Explain your answer.
AfilCa [17]

Answer:

Semi-conservative replication

Explanation:

After the double-helix discovery of Watson and Crick, there were three possible models about the DNI replication:

  • The Conservative model stated that the two strands of DNI together were the template of another new molecule. The final product was the original double-stranded molecule and the new molecule.
  • The semi-conservative model stated that the original DNI molecule separated into two strands, and each of them served as a template for the synthesis of a new complementary strand. The replication product would be two double-stranded DNA molecules, each carrying an original strand a new one.
  • The Dispersive moles stated that the replication product would be two molecules made by a mixture of segments of the original and the new molecules.

Meselson and Stahl joined to discover which of the models was the correct one. To do it they used E. coli and Nitrogen isotopes.

  • First, they extracted DNI from bacteria grown in a medium with N¹⁴ and got its density band by centrifugation.
  • Then they grew bacteria in a medium with N¹⁵, extracted their DNI molecules, centrifugated them, and got the density band, which was heavier than the firsts ones.
  • The researchers then transferred bacteria grown in medium with N¹⁵  to a medium with N¹⁴, and they allowed only one replication process to occur. DNI was extracted and centrifugated again, and a new band appeared. This band was an intermediate form between bands of DNI-N¹⁵ and DNI-N¹⁴.

This event <em>eliminated the conservative model</em>. If this model were correct, the expected result would be to get two bands: one corresponding to the density DNI-N¹⁵ and the other corresponding to the density DNI-N¹⁴.

  • Bacteria grown in a medium with N¹⁵ and then transferred to a medium with N¹⁴ were finally allowed to replicate twice. Their DNI was extracted and centrifugated. The result was two bands: one of them coincided with the intermediate band, and the other one with the DNI-N¹⁴.

<u>This result was conclusive</u> because if the dispersal model were correct, these two bands should not appear, as all the DNI strands would have part of the original molecule.

With this experiment, Meselson and Stahl proved that the correct replication model was the semi-conservative one.

5 0
3 years ago
Select all that are true about the different types of polysaccharides. (There may be more than one correct answer).
Natali5045456 [20]

Answer: The correct answer is 2, 3 and 5.

Explanation:

Glycogen: This is a branched biopolymer that consists of linear chains of glucose residue that are linked together by alpha 1,4 glycosidic bonds. Branches are linked to the chains from which they are branching off by alpha 1,6 glycosidic bonds between the first glucose on the new branch and a glucose on the stem chain.

Cellulose: This is a structural polysaccharide that is found in cell walls of plants and it acts as dietary fiber when consumed. Cellulose has beta 1,4 linkages that can not be properly digested.

Starch: This is a linear chain of glucose molecules attached by alpha 1,4 bonds

4 0
3 years ago
Read 2 more answers
19. During DNA replication, a complementary strand of DNA is made from each original DNA strand. Thus, if a portion of the origi
Lerok [7]

Answer:

AAGCGATGCGA

Explanation:

Because it is complementary base pair so A always pairs with T and G always pairs with C. u can also remember them as Apple Tree and Car Garage.

hope this make sense:)

5 0
2 years ago
Lab: Magnetic and Electric Fields
Whitepunk [10]

Answer:

im sorry but wht class is this for

Explanation:

4 0
3 years ago
Read 2 more answers
During transcription, is the original sequence maintained in the new strands? explain why or why not
Lorico [155]
Sorry , but idk the answer to your question
8 0
3 years ago
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