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weeeeeb [17]
3 years ago
11

Sean has a bag with 15 marbles,six of the marbles are red,and 9 are blue. If Sean draws one marble from the bag,the probability

of drawing a red marble is......%
Biology
1 answer:
Kaylis [27]3 years ago
8 0

Answer:4

Explanation:

Total number of marbles:5

Number of red marbles:6

6/15=2/5=0.4

0.4x100 = 40%

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Which of the following statements describe a plants role in a water cycle?
4vir4ik [10]
Plants absorb the water from the soil ( through their roots) and then release it back into the atmosphere by transpiration (evaporation from the leaves)
7 0
3 years ago
(honest question) How come whenever archaeologists uncover human remains they are always male or female and not any of the other
Doss [256]

I think you're confused. There are only two sexes, male and female. Sex is what you were biologically born as from birth, while gender is what you choose to identify as. Gender is a choice, sex isn't. They couldn't discover any other genders because at the time they probably didn't even know what gender was like three thousand years ago, therefore they couldn't look like a different gender.

3 0
2 years ago
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
100 POINTS. What is the difference between a learned behavior and an inherited behavior? Give one example of each. Please will m
Eva8 [605]

Answer:

An Inherited behavior is a behavior received from the parents through genetics such as long legs for speed while a learned behavior is a behavior in wich an animal has to learn by itself by looking at past experiences such as baby ducks learning how there mother duck avoids danger.

Explanation:

4 0
3 years ago
Read 2 more answers
Would a hypothesis for example be “it is cloudy” and the prediction would be “it will rain” ? can predictions be wrong even if t
Sliva [168]

Answer:

1st one is no, i think the second is no

Explanation:

hypothesis is an if-then statement and predictions are made based off the hypothesis

hypothesis ex: "if you get at least 6 hours of sleep, [then] you will get better grades on tests than if you get less sleep."

prediction: "i will get a lower grade if I get 2 hours of sleep than I will if I get 6 hours of sleep"

5 0
3 years ago
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