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EastWind [94]
3 years ago
8

A scientist wants to prove that certain chemicals in cosmetics are likely to cause harm to developing fetuses, when used by a pr

egnant mother. What is the most likely limitation she will face in her scientific design?
Biology
1 answer:
likoan [24]3 years ago
3 0
The limitation is that she can't test is on humans for ethical reasons. In order to test this, theoretically, she would need to ask some women to use this cosmetic and compare their fetuses to the fetuses of women who didn't. But this is not likely to be approved by the ethical committee, as causing damage to a fetus is not ethical.
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Chargaff's rule states that the amounts of guanine and cytosine are roughly the same, and the amounts of adenine and thymine are
Mazyrski [523]

Answer:

True.

Explanation:

The Chargaff's rules indicate that in the DNA of all living organisms the amount of adenine (A) should be equal to the amount of thymine (T), while the amount of guanine (G) should be equal to the amount of cytosine (C). These rules were useful to describe the structure of  the double helix and also enable to describe base patterns that often are associated with specific gene regions (for example, promoter regions are rich in AT). Moreover, an imbalance in the 1:1 equilibrium ratio is associated with mutations that may cause diseases such as cancer.

8 0
3 years ago
What is work?
likoan [24]
I believe it’s A. Not sure though
4 0
2 years ago
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An atom has an atomic number 17 and atomic mass number 35. How many neutrons are present in its nucleus?
Pie

Answer:

B. 18

Explanation:

An atom, which is the smallest indivisible particle of matter, further contains certain particles called SUB-ATOMIC PARTICLES namely: proton, neutron and electron. In a neutral/uncharged atom, the number of proton is equal to the number of electrons. The number of protons in an atom represent its ATOMIC NUMBER.

However, the sum of the proton number and neutron number gives the MASS NUMBER i.e. mass no. = proton no. + electron no.

Hence, according to this question which states that an atom has an atomic number of 17 and a mass number of 35. The neutron no. can be calculated as follows:

Neutron no. = mass no. - proton no.

Neutron no. = 35 - 17

Neutron no. = 18

8 0
3 years ago
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All matter made of four elements
Mars2501 [29]

Answer:

The first theories of matter were put forward by Empedocles in 450 BC, he proposed that all matter was composed of four elements - Earth, air, fire and water. Later, Leucippus and Democritus suggested matter was made up of tiny indestructible particles continuously moving in empty space.

Explanation:

Got it from google hope this help :))

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2 years ago
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Which chamber of the heart pumps deoxygenated blood to the lungs?
Kamila [148]
The right ventricle pumps deoxygenated blood to the lungs.
5 0
3 years ago
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