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andrey2020 [161]
3 years ago
8

What does the word fossil mean

Biology
2 answers:
Alla [95]3 years ago
7 0

Answer:

The remains of an organism that are preserved as a mold or cast in rock.

Explanation:

zvonat [6]3 years ago
5 0
It means the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in :)
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Explain how the digestive tract of different invertebrates affects the size of the organisms they eat.
AlexFokin [52]

My answer will be because these characteristics intervene in the capture and assimilation of the food, having 4 general food behaviors: (1) detritivores, consume a lot of material from the bottom of the water source, (2) herbivores, who consume mostly plant components (filamentous algae and higher plants); (3) periphyton consumers, who are characterized by feeding on microalgae and microinvertebrates and (4) omnivores, in which they indistinctly feed on plant material as an animal of different origin.

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2 years ago
Which two structures would provide a positive identification of a plant cell under a microscope?
Sonbull [250]
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3 years ago
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3 years ago
The lactose (lac) operon in E. coli is an example of a repressed gene when lactose is not available in a cell. In 3-5 sentences
irakobra [83]

Answer:

Please find the detailed explanation of this statement below

Explanation:

Firstly, a repressed gene is a gene whose expression has been inhibited or repressed. The lac operon in E.coli bacteria is a regulatory unit containing structural genes, a single promoter and operator regions. The promoter is the region where the transcription enzyme (RNA polymerase) binds to in order to transcribe the genes in the lac operon. The structural genes in the lac operon can only be expressed in the presence of lactose sugar.

However, in the absence of lactose, LAC REPRESSOR, which is a transcription factor (protein), prevents the binding of RNA polymerase to the PROMOTER region by binding to the OPERATOR region of the lac operon. This inhibits the expression of the lactose genes in the operon.

Note that, the structural genes in the lac operon (lacZ, lacY, lacA) code for proteins that help break down lactose sugar for energy in the E.coli bacteria. Therefore, a bacteria cell with a repressed lac operon will be unable to degrade lactose sugar.

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3 years ago
which of the following is not a function of skin? to protect the body from infection to prevent the body from drying out to prot
o-na [289]
Ok, think about it.  Does your skin prevent germs from getting inside you?
Does your skin prevent water from leaving the body too quickly?  Does your skin protect your insides from getting damaged when you fall?  Do you put food on your skin to absorb nutrients, or do you put food in your mouth like a normal person?
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