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Katarina [22]
3 years ago
7

The lower rocks in the Muav limestone are 505 million years old. The upper rocks in the Redwall limestone are 340 million years

old. What could explain the gap?
Biology
1 answer:
Alex777 [14]3 years ago
6 0

Unconformity

Explanation:

The gap between the lower and upper limestone layer can be explained by the occurrence of an unconformity.

An unconformity is a break in stratigraphic record usually marked a prolong period of non-deposition or erosion.

A major break of several millions of years is called a hiatus. A minor break is a diastem.

  • During a period of non-deposition, no materials are brought into the basin.
  • This can last for several years until deposition resumes again.
  • Such a prolonged period of non-deposition causes a break in stratigraphic record.
  • At other times, stratigraphic records can be lost to erosion.
  • Erosion entails the washing away of the earth.
  • This will ultimately cause the loss of records between two strata till deposition resumes.
  • In most strata, periods of non-deposition and erosion usually takes place hand in hand.

learn more:

Wind erosion brainly.com/question/2115729

#learnwithBrainly

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Answer:

DNA vaccines consist of DNA vectors or plasmids (small double-stranded DNA rings originally derived from bacteria, but unable to cause infection) into which the genes encoding one or more immunizing proteins of the infectious agent have been inserted causing the disease to be prevented.

Explanation:

Vectors are the functional unit of naked DNA vaccines. Genes that encode the proteins of interest and are of bacterial origin are inserted into these vectors. Bacterial plasmids are circular DNA molecules that self-replicate extrachromosomally in bacteria. The genes encoded in these plasmids are under the control of promoters, almost always of viral origin. When a plasmid is introduced into the cell it translocates to the nucleus, where transcription of the transgene begins; the transcripts are then taken to the cytoplasm and translated there. The newly synthesized proteins are degraded in the proteasome to 8-10 amino acid peptides, which are transported to the endoplasmic reticulum. Peptides of high affinity with their respective MHC I molecule stabilize and enter the secretory pathway, thus reaching the cell surface, where they are coupled with the T-lymphocyte receptor (TcR) present on the surface of T lymphocytes cytotoxic drugs (CD8 +) to induce their activation.

4 0
2 years ago
In humans, attached earlobes are recessive to free hanging earlobs. If two heterozygous free lobed parents mate, what is the cha
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7 0
3 years ago
A children's liquid medicine contains 100 mg of the active ingredient in 5 mL . If a child should receive 150 mg of the active i
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Answer:

The correct answer is 7.5 ml

Explanation:

The medicine contains 100 mg in 5 ml, that means that the concentration of the active ingredient is 100 mg/5 ml= 20 mg/ml

If we divide a concentration (in mg/ml) into a mass (in mg) we obtaine a volume (in mL). Thus, in order to calculate the mililiters of medicine which contain 150 mg of the active, we have to only divide mass (150 mg) into the concentration of active ingredient as follows:

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Which types of mutations in the lac operon stop Escherichia coli from utilizing lactose as a carbon source? a) promoter deletion
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Answer:

D.) repressor DNA-binding site mutation

Explanation:

lacl prevents the repressor polypeptide is a mutant that prevent operon from binding lactose, and thus will bind to the operator and be non-inducible.. This mutant will represses the lac operon whether lactose is present or not and the lac operon will not be expressed. It is also called“super-supperesor".

The lacI locus – One type of mutant allele of lacI (callled I-) prevents the production of a repressor polypeptide or produces a polypeptide that will not allow to bind to the operator sequence.

This is also a constitutive expresser of the lac operon because absence of repressor binding permits transcription.

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The ________ is the single shape a protein adopts under physiological conditions. most stable enantiomer primary structure minim
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Answer:

Native conformation

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