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2 years ago

Which best describes a difference between transcription and DNA replication?

Biology

2 answers:

Sedaia [141]2 years ago

8 0

The right answer is A.Transcription uses uracil.

The genes carried by the DNA will be encoded in another form: messenger RNA, during a process called "transcription".

The DNA and RNA molecules are chemically very close, but the second has an extra oxygen (in red on the right of the letters) on the sugars (riboses) that make up its nucleotides (the DNA actually contains deoxyribose). In addition, the thymine (T) of DNA is replaced by uracil (U) in RNA.

seropon [69]2 years ago

5 0

Answer:

Transcription uses uracil (APEX)

Explanation:

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Which of the following best describes the mechanism by which steroid hormones control gene expression? View Available Hint(s) Wh

Veseljchak [2.6K]

Answer:

Steroid hormones that enter the cell activate receptors. These hormone-receptor complexes then bind HREs and influence gene expression.

Explanation:

Mechanism of action of steroid hormones is as follows:

Steroid hormone enters cell and bind to the receptor.
Translocation of activated receptor- ligand complex into nucleus.
This complex then bind to another receptor on the chromatin.
Steroid receptors form dimers.
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These hormone-receptor complexes then bind HREs and influence gene expression.
Augmentation or Suppression of transcription.

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2 years ago

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which of the following normally occurs regardless of whether or not oxygen (o��) is present?; a) glycolysis; b) fermentation; c

Leno4ka [110]

Hey hi your answer would be A<span> glycolysis </span>

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2 years ago

1. Describe DDT and summarize the history of the use and banning of DDT, including actions taken by the U.S. government. State t

igomit [66]

DDT stands for dichloro-diphenyl-trichloroethane. The first kind of synthetic/artificial insecticides came into use in the 1940s. The earlier usage of DDT include: a) Killing of malarial vectors, b) Combatting Typhus and other insect borne human diseases, c) As a pest control in crops d) as a pest control in garden, live stock production and even at homes.

The negative impact of DDT could be felt for the first time when the pests that were earlier killed by use of DDT have now become pesticides resistant. In the 1950s in USA, the regulatory measures were adopted to reduce the usage of DDTs as its effects as a pesticides were no more long significant and also it was creating detrimental physical and psychological impacts on the human and environment.

It was in 1972 that the U.S. Environmental Protection Agency cancelled the order for banning the usage of DDT based on the adverse impact it produced on the environment, human and other life forms. Since then continuous studies are being conducted to analyse the impact of DDTs. In some later years it was established that DDT is the cause of producing tumors in liver.

Some of the common negative impacts produced by DDT as per the U.S. Department of Agriculture :

a) The non destructive nature – DDT can not be destroyed and thus it remains persistent in the atmosphere

b) It attacks the tissues of living organisms especially the animals and humans ( fatty tissue)

c) It can penetrate the atmosphere to deeper extent.

Now as per the current stuation, The use of DDT is controlled and other alternatives of pest control organisms is being deduced. As per the treaty of Stockholm Convention on POPs (Persistent organic pollutants) , usage of DDT for malarial control is justified but it puts a restrictive use of DDT as pesticides in other areas.

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2 years ago

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Stem cells found in adult tissue, such as in the bone marrow, brain, muscle, skin, and liver, are only capable of .

BigorU [14]

They are capable of renewing and dividing (multiplying) themselves for long periods of time, they are unspecialized, and they can give rise to other specialized cell types. Hope this helps!! :)

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Compare and contrast the differences between mature human eggs and sperm in the following questions. For each prompt, determine

Llana [10]

Answer:

QUESTION 1:

a. They undergo unequal cytoplasmic division during meiosis- eggs

b. Their chromosomes have undergone genetic recombination and independent assortment- both gamete types

c. They contain specialized secretory vesicles called cortical granules just under the plasma membrane- eggs

d. They are characterized by a flagellum. Most of these gametes die without ever completing meiosis- sperm

e. The acrosomal reaction occurs in these cells- sperm

f. They can be derived from any adult cell type- neither gametes

QUESTION 2:

c) The egg is surrounded by a mineralized shell added before the egg exits the body.

Explanation:

a) Female reproductive cells undergo meiosis to produce one large egg and three polar bodies. However, an unequal cytoplasmic division occurs in favour of the large egg.

b) Since both egg cell and sperm cell are produced via meiosis and meiotic division involves the processes of genetic recombination and independent assortment, hence, both gamete types have their chromosomes underg genetic recombination and independent assortment.

c) Egg cells contain specialized secretory vesicles called cortical granules just under the plasma membrane. This cortical granules help prevent more sperms from fertilizing the same egg after it has been fertilized.

d) Sperm cells possess flagellum for motility in the female reproductive tract. Most of the sperm cells die without ever completing meiosis.

e) Sperm cells possess an head-covering structure called ACROSOME. Acrosome reaction is the process undergone by sperm cells permeate the zona pellucida of the egg.

f) Gametes are specifically derived from adult reproductive cells and hence, NEITHER TYPE OF GAMETE can be derived from any adult cell type

QUESTION 2:

The egg in Sea urchins is surrounded by a mineralized shell added before the egg exits the body to the external environment. This does not occur in the humans because the egg does not leave the body but fertilized internally.

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2 years ago