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2 years ago

Please can i get some help (; <33

Biology

2 answers:

Natali5045456 [20]2 years ago

7 0

Answer:

It should be Carbon Cycle!

Explanation:

The other answers aren't involved with carbon. Hope this helps.

emmainna [20.7K]2 years ago

6 0

The person above me should be right if not then I have no idea .

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Why were Cynognathus fossils were important to Wegener's theory?

AveGali [126]

Answer:

Cynognathus fossils were important to Wegner's theory because they were found on lands now separated by a wide ocean.

Explanation:

Wegner used the fossil of cynognathus as evidence to prove his continental drift hypothesis. Cynognathus are reptiles which lacked the swimming ability. These reptiles survived in the land before separation in live form along with other organisms surviving side by side.

Later due to certain natural phenomenon these reptiles died and the land got separated by a wide ocean. The fossils of cynognathus reptiles are now found in the lands that are separated by wide ocean.

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3 years ago

The trp and lac operons are regulated in various ways. how do bacteria regulate transcription of these operons?

Vlada [557]

Operon is not transcribed:

-lac operon: lactose absent

-trp operon: tryptophan present

Positive control transcription of Operon does not speed it up:

Lactose and glucose are present, -lac operon

Tryptophan is lacking in the -trp operon.

Operon is transcribed quickly through positive control:

-lac operon: lactose present, glucose not

Only negative control is used to regulate the trp operon. The operon genes are not transcribed when tryptophan is present.

Both positive control and negative control are used to control the lac operon.

Negative control: —Transcription is inhibited when lactose is missing due to the activity of the repressor protein.

—The repressor protein is deactivated and transcription is triggered when lactose is present.

Positive control: —In the absence of glucose, another regulatory protein (CAP) attaches to the lac operon's promoter, speeding up transcription in the presence of lactose.

Learn more about lac operons here:

brainly.com/question/1695549

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1 year ago

Describe the structure and make up of DNA

Sauron [17]

Answer:

DNA structure DNA is made up of molecules called nucleotides. Each nucleotide contains a phosphate group, a sugar group and a nitrogen base. The four types of nitrogen bases are adenine (A), thymine (T), guanine (G) and cytosine (C).

Explanation:

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2 years ago

Which traits are codominant or incompletey dominant? ( these traits don’t have a clear dominant or recessive , the heterozygous

ankoles [38]

Answer:

Codominant- traits don’t have a clear dominant or recessive

incomplete dominance- the heterozygous condition shows a “blending” or a “middle” condition

Explanation:

In codominance, the traits are expressed equally in the phenotype thus they don't have a clear dominant or recessive state. For example the ABO blood group alleles. The alleles A and B are codominant each being expressed equally.

In incomplete dominance the traits show intermediate expression where one allele expresses itself more strongly than the other. An example in man is seen in the inheritance of the disease sickle cell anaemia. Heterozygote who carry the sickle cell gene are said to have sickle cell trait and as such the carrier allele (HBa) has a stronger influence on the phenotype than the dominant alle (HBs).

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2 years ago

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rjkz [21]

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2 years ago

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