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3 years ago

8. Devices that absorb neutrons and are used to control the speed of a fission

Biology

1 answer:

ICE Princess25 [194]3 years ago

6 0

Answer:

C. control rods

Explanation:

Devices that absorb neutrons and are used to control the speed of a fission reactor are called control rods. They are used in nuclear reactors to control the fission rate of uranium and plutonium. They are composed of chemical elements that are capable of absorbing many neutrons .

hope this helps :)

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What three letter codon will produce Tryptophan?

Taya2010 [7]

Answer:

UGG

Explanation:

Look at a codon chart then look for Tryptophan then look for the 3 letter codon that corresponds

3 0

2 years ago

Suppose the femur bone of an animal has 1,000 atoms of carbon-14 when the animal dies. How many atoms of carbon 14 will be prese

shtirl [24]

Answer:

After 6000 years, approximately 500 atoms of carbon-14 will be left in the femur bone of an animal which had 1000 atoms of carbon-14 when the animal died.

Explanation:

The half-life of a radioactive isotope of an element is the time taken for half the atoms present in a given amount of the element to undergo decay or disintegration. For example, the half-life of carbon-14 isotope is 5730 years. This means that, if there are 100 atoms of carbon-14 present in a given sample of a material, in the next 5730 years, approximately, 50 atoms of carbon-14 will be left in the material.

Since the half-life of radioactive isotopes are constant, these radioactive isotopes are used in the determining the ages of ancient life-forms as well as rocks.

In the given example, after 6000 years, approximately 500 atoms of carbon-14 will be left in the femur bone of an animal which had 1000 atoms of carbon-14 when the animal died.

8 0

3 years ago

Hunt and her team designed an experiment to test her hypothesis about the effect of BPA on mice. They administered daily doses o

katovenus [111]

Answer and Explanation: The figure below shows the doses of BPA administered to the female mice over time.

An experiment is used to determine cause and effect among variables. When the research is for the impact of a treatment, researchers randomly separate individuals in two groups:

Control Group doesn't receive any treament or a placebo or a treatment whose outcome is already known;
Treatment Group receives the treatment;

For the female mice on the image below, in the First Group is not injected any dosage of BPA, so they are the control group, while the others are treatment group.

The variables in a experiment are classified as independents or dependents:

Independent Variable is the cause;
Dependent Variable is the effect;

For the BPA research, since it is the effect of BPA over time on the mice's cells it is being investigated, dosage of BPA is the independent variable and time is the dependent variable.

6 0

3 years ago

In phase-contrast microscopy, the differences in refractive indices between organisms and their environments are utilized for be

mina [271]

Answer:

True

Explanation:

In phase-contrast objective and a phase contrast optical systems is equipped with Light microscope .

Phase contrast microscope is used to differentiate unstained structures in a cell that differ in refractive indices and thickness. Thus it is usefull for examining living unstained organisms.

Light that passed through materials of different refractive index and/or thickness will undergo a change in Phase. The difference in phase or wave front irregularities cause variation in brightness of the structures.

Hoping this might help!!!

7 0

3 years ago

This morning you awoke to the wonderful smell of cinnamon rolls cooking. Your roommate offers you one of these fresh baked delic

yaroslaw [1]

Answer:

Ego-depletion.

Explanation:

Ego-depletion may be defined as the idea used to self control upon the mental resources that can be used by the individual. Individual with low mental ability has low self control.

The individual that suffers from ego-depletion has impair ability to control themselves for the later time. This might even cause the hindering in the self control as well. Self control is important for an individual even at personal levels. The ego-depletion might create hard time for the restraint.

Thus, the answer is ego-depletion.

4 0

3 years ago