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Korolek [52]
3 years ago
8

A scientist is studying the metabolism of proteins in yeast and wants to follow the formation of proteins from the earliest poss

ible point. In her experiment, she will feed the yeast radioactive nutrients and follow the fate of the radioactivity in the cells. Which of the following atoms will allow her to exclusively follow proteins in the cell?
A. Radioactive nitrogen
B. Radioactive carbon
C. Radioactive oxygen
D. Radioactive sulfur
Biology
1 answer:
kvv77 [185]3 years ago
4 0

Answer:

D) Radioactive sulfur.

Explanation:

The process begins by labelling the yeast with the radioactive sulfur and then it is incorporated into the peptides. Then the scientists can detect and isolate small portions of it.

Radioactive sulfur is preferred  for this process because it is short-lived.

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Which of the organisms listed below performs nitrogen fixation?
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A planet has a mass of 5.97 x 1024 kg and a radius of 6.38 x 106 m. Find the weight of a 65.0 kg person at 1000 km above the sur
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<u>Answer:</u> The weight of the person above the surface of a planet is 635.83N.

<u>Explanation:</u>

To calculate the weight of a person, we use the formula:

w=mg     ....(1)

where,

w = weight of an object

m = mass of the person = 65kg

g = acceleration due to the gravity of the planet

For the calculation of weight, we need to first find the acceleration due to gravity and for that we use the formula:

g=\frac{GM}{r^2}

where, g = acceleration due to gravity = ?m/s^2

G = Universal gravitational constant = 6.67\times 10^{-11}Nm^2/kg^2

M = mass of the planet = 5.97\times 10^{24}kg

r = distance of the person from the planet = 6.38\times 10^6m

Putting values in above equation, we get:

g=\frac{(6.67\times 10^{-11}kgm/s^2.m^2/kg^2)(5.97\times 10^{24}kg)}{(6.38\times 10^6m)^2}\\\\g=9.782m/s^2

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w=65kg\times 9.782m/s^2=635.83N

Hence, the weight of the person above the surface of a planet is 635.83N.

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