BIOLOGY HIGH SCHOOL

Some fish and amphibians have _____, which detect electrical fields that help them navigate through dark, murky waters.A. photoreceptors
B. olfactory receptors
C. electroreceptors
D. thermoreceptors

Answers

Answer 1
Answer: Electroreceptors. Fishes use this ability since the water is a betterelectrical conductor than air. It helps them to know their location, torecognize their location in the water. They can also find objects due tothe electrical fields. This is the correct.
Answer 2
Answer: The answer is C. Electroreceptors are used by certain species of fish to detect electrical fields. This can be helpful in finding prey or avoiding predators. It is a specialized ability, though, and many animals do not posses this trait.

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must EVERY member of a particular species (one kind of organism) be able to reproduce in order for the species to survive? Explain why or why not.

Can someone pleasee answer thiiisss pleasee

Answers

Answer:

Hi how are you doing today Jasmine

Consider the following food chain:Plants are eaten by grasshoppers, which are eaten by mice, which are eaten by snakes.
What would happen to the other members of the food chain if the plant population was wiped out?
a. The populations of grasshoppers, mice, and snakes would increase.
b. The populations of grasshoppers and mice would increase, while the population of snakes would decrease.
c. The populations of grasshoppers would decrease, while the population of mice and snakes would increase.
d. The populations of grasshoppers, mice, and snakes would decrease.
D?

Answers

It's D, Without plants for the grasshopper to eat they would begin to decrease in population causing a decrease in mice population from the lack of food supply and so forth for the snake. 

Answer:

D

Explanation:

Which cell structure directs the cell activities

Answers

The nucleus -- it is the powerhouse of the cell!

Answer:

meb is right  give him stars plz im saying this so no one can give you the worng Answer

EEG is to CT as:x-ray photographs is to recordings of brain waves



recordings of brain waves is to x-ray photographs



radioactive emmissions is to recordings of brain waves



recordings of brain waves is to radioactive emissions

Answers

The correct answer is recordings of brain waves is to radioactive emissions

That's because the EEG is basically just a scan of how your mind is working, while a CT scan uses X-rays which have radioactive emmision and are used to create an image of your body from various angles and various depth.

The minimum degree of rotation by which this octagon can map onto itself is?

Answers

An octagon has 8 sides

The minimum degree of rotation would be achieved in an octagon will all sides and angles equal, and this rotation would then be 360/8=34 Degrees

Before leaving the nucleus, the pre-mRNA transcript formed through transcription undergoes a series of enzyme-regulated modifications. Part of the process is illustrated below. Without this modification, why would mRNA be translated into a nonfunctional protein?

Answers

Post transcription

Explanation:

Before leaving the nucleus, the pre-mRNA transcript formed through transcription undergoes a series of enzyme-regulated modifications which includes: 5'capping,splicing,3' cleavage(polyadenylation) and RNA editing

  • 5' capping is the first modification event in the pre mRNA that occurs after 20-30 nucleotide addition,in capping a 7 methyl guanosine(cap) is added to the 5' end of pre-mRNA
  • Splicing is the second modification event of pre-mRNA occurs in nucleus just after transcription but before the RNA moves to the cytoplasm
  • In RNA splicing non coding regions of pre-mRNA called introns are removed and coding regions called exons are religated
  • If this modification does not occur then introns will be copied from DNA that will interrupt the genetic code
  • Most of mature eukaryotic mRNA have 50-250 adenine residue at the 3'end called Poly A tail
  • These nucleotides are not encoded by the genome but are added after transcription,process is called polyadenylation
  • Polyadenylation is both template and primer independent process catalysed by polyadenylate polymerase and protects mRNA from exonuclease at 3'end
  • RNA editing is defined as the change of nucleotide sequence of RNA which is carried out in two different ways: site specific base modification and insertional or deletion type of RNA editing

Answer:

Introns are regions of pre-mRNA copied from DNA that interrupt the genetic code.

Explanation:

1. DNA is first transcribed into pre-mRNA, then this pre-mRNA further go series of modification, like 5' capping, 3' polyadenylation and RNA splicing.

2. Through splicing, introns are removed and exons are joined together to form a mature RNA known as mRNA.

3. If without these modifications, RNA is translated, it would encode non-functional protein because all the codons in the pre-mRNA would translated and introns would code a non-functional protein.
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