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IgorLugansk [536]
3 years ago
14

Which happens first when a DNA double helix is formed?

Biology
2 answers:
Sedbober [7]3 years ago
5 0

Two nucleic acid strands line up next to each other.

Lelechka [254]3 years ago
3 0

Hydrogen bonds will appear inside the double helix.

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A/an ___ is a type of research that involves observation and collecting data but does not include a control.
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D. Because experimentation includes a control group. also, independent and dependent variables are part of an experiment they arent a type of research
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Which is not something that occurs in translation? A codon and an anticodon pair. A peptide bond is created. A molecule of mRNA
Veseljchak [2.6K]

Answer:

A molecule of mRNA is formed.

Explanation:

Translation is the second process that occurs in gene expression. It is the process by which the information encoded in the mRNA transcript is used to synthesize a protein.

The mRNA nucleotide sequence is read in a group of three nucleotides called CODON. Each codon specifies an amino acid. Translation, which occurs in the ribosomes (cytoplasm), reads the codon with an anticodon using the complementary base pairing rule i.e. A-U, G-C. This means that a CODON-ANTICODON pairs.

The anticodon carries a corresponding amino acid to the polypeptide sequence. A peptide bond is formed when two amino acids joins together in a condensation reaction.

Note: A molecule of mRNA is formed during transcription

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Which is an abiotic factor that affects a freshwater ecosystem?
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<span>C.The amount of light </span>
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You are doing an experiment and plated E. coliin different medias. Media A has onlyglucose, B has only lactose, and media C has
krek1111 [17]

Answer:

A. Glucose:

As lactose is absent will follow the glucose metabolism, so the lac repressor will hold tightly with the operator which leads to the prevention of transcription as RNA polymerase can not bind to promoter so no lactose metabolism.

B. lactose:

In the case or wild mutant lactose metabolism will occur as lactose is present, allolactose binds to the lac repressor thus the operator and promoter are free so transcription starts.  The same result will be in all test except in the case of a mutant repressor.

C. glucose and lactose:

In this case, diauxic growth will occur. This growth takes place when two sugars are present in the media. The preferred sugar will be consumed first That is glucose. Then a lag phase will come which will be followed by the second sugar metabolism that is lactose.  the given two cases :

Lactose will be metabolized first, as operator site mutation prevents repressor protein binding and thus will lead to the constitutive synthesis of lac operon in test B.   The same thing will happen, as in this case also, constitutive synthesis of lac operon will happen in test C.

Cultures grown in the presence of both glucose and lactose are metabolizing lactose. In the test (b) and (c) will be responsible due to constitutive synthesis of lac operon will happen.

6 0
3 years ago
SRB
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Answer:

Photosynthesis is a process whereby plants uses sunlight to prepare their own food using sunlight and without energy such as heat cannot perform its functions.

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