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3 years ago

The graph below shows the radioactive decay of a material whose half life is 25 years.

1 answer:

5 0

The half life is the time taken for the amount of a substance to become half of its original value. If we take the initial value to be 30 on the y-axis, the half of 30 is 15. We check the time at which the substance has reduced to 15 atoms and this is about 40 seconds. 40 seconds therefore, is your answer.

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In vertebrates, one way this stability is accomplished is through the actions of

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Answer:

Skeleton and the skeletal system

Explanation:

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2 years ago

Which of the following pushes the

garik1379 [7]

Answer: A- cell wall
A new cell wall forms between the two membranes of the cell plate.

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3 years ago

Read 2 more answers

Purpose: How does DNA function in a cell.

lana [24]

Answer:

The main role of DNA in the cell is it's a Long term storage of information

Explanation:

The main role is to read the genetic code, cells make a copy of a stretch of DNA in the nucleic acid RNA

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3 years ago

To investigate the possible presence of introns in three newly discovered genes (X, Y, and Z), you perform an experiment in whic

REY [17]

Answer:

a). At least one intron must be present in gene X.

b). At least two intron must be present in gene Y

c). It is impossible to determine whether there are any introns in gene Z.

Explanation:

Introns may be defined as the segments in the RNA molecule or the DNA molecule that does not code for proteins and they interrupts the sequences of each of the molecules.

In the context, we get :

a). In the gene X, at least one of the intron is present. Sometimes more than one introns may also be present. Due to slicing, we get one band less in the cDNA which is made from the mRNA.

b). In dene Y, at least one intron is present. Sometimes more than one introns are present inside the gene Y. In this case we get two bands less in the gene due to slicing.

c). In gene Z, it is not possible to determine the number of introns present in them. In genes X and Y, the Haelll enzyme is present in the intron. Therefore we get less of band after splicing the mRNA to cDNA.

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3 years ago

When students start to feel the accumulating effects of stress, they might look for ways to prevent stress, deal with it, or mas

Otrada [13]

Answer:

Hence, the correct matches are:

A) - 4), 3), 9)

B) - 7) , 5), 10)

C) - 1), 2), 6), 8)

Explanation:

A stressor is a chemical or biological agent, a state of the environment, an external stimulus or an occurrence known to trigger stress to an organism.

Stressor will include 4) breaking up after a long relationship, 9) feeling burdened by academic pressure, and 3) suffering from overly noisy surroundings

Healthy stress management tips are helpful for reducing stress level.

healthy stress management techniques will match 7) practicing yoga a few times per week , 5) watching a sitcom and laughing out loud, preferably with friends , sleeping at least 7 hours per night, and 10) exercising regularly .

detrimental stress management techniques involves activities that harms the human helath and causes stress.

detrimental stress management techniques matches 8) using recreational drugs as an escape , 6) going out and binge drinking in order to blow off steam,2) eating a whole tub of ice cream for comfort , and 1) consuming multiple energy drinks to keep up during all-nighters through finals.

Hence, the correct matches are:

A) - 4), 3), 9),

B) - 7) , 5), 10)

C) - 1), 2), 6), 8)

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3 years ago