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Vinil7 [7]
1 year ago
6

Which of the following regarding puberty is FALSE? Select one: a. Early signs of puberty include breast budding in girls and gro

wth of the testes in boys. The first sure sign of puberty is menarche (first period) in women and nocturnal emissions (wet dreams) in men. b. A trigger is the maturation of the adrenal gland leading to production of androgens, which begins sometime between 6 and 8 years of age. c. It results in an increase of androgens in the female body and a decrease of androgens in the male body. d. In girls, it requires the proper fat/protein ratio for menarche to occur.
Biology
1 answer:
maks197457 [2]1 year ago
4 0

Answer: C

Explanation:

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Amino acids all contain nitrogen and these are the building blocks that make up the proteins in your hair, muscles, skin and other important tissues. Nitrogen is an important part of your DNA, which defines what you are like in many ways.
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When two pea plants with Tt genotypes are cross-bred how many short (tt) plants will there most likely be in the new generation
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25%

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A DNA fragment is introduced into the lacZ gene of a plasmid, which also contains an ampicillin resistance gene. What is the app
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Answer: The bacteria transformed with this particular plasmid will form white colonies on the plates containing ampicillin and Xgal.

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In recombinant DNA technology, when a plasmid is to be used to transform a host cell, such markers are used to help screen the transformed cells from the ones that have not taken up the plasmid. Xgal present in the plates is an artificial substrate which is hydrolyzed by

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Therefore, when a bacterial cell is transformed with a plasmid containing ampicillin resistance gene and a DNA fragment introduced in the lacZ gene and then grown on plates containing ampicillin and Xgal, white colored colonies will appear. The white colonies will show the bacterial cells that have successfully taken up the plasmid with the DNA fragment incorporated in the lacZ gene as this will render the gene non-functional and will not produce β-galactosidase which will breakdown Xgal to give blue colonies. Since the plates contain ampicillin, only the bacterial cells that have been successfully transformed with the plasmid ( the ones that have the DNA fragment and the ones without it) will grow as the ampicillin resistance will give them resistance against ampicillin in the plates. The bacterial cells that have not taken up the plasmid will not be resistant to ampicillin and will not form colonies on the plate.

This is called blue-white screening which is used to identify successfully transformed host cells. A picture of this is given in the attachment, taken from the following website:

https://www.mun.ca/biology/scarr/Blue_&_White_Colonies.html

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Which choice below lists the biomes in order from lowest average temperatures to highest average temperatures?
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Answer:

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