Answer: Reptiles include snakes, turtles and lizards, while amphibians include toads, frogs and salamanders. One difference between reptiles and amphibians is their relationship with water.
Explanation:
Amphibians:
- Skin is smooth and highly porous.
- The webbed feet help them to swim.
- Their eggs are covered with gel.
Reptiles:
- Skin is dry, hard and scaly.
- They have limbs to facilitate running and swimming.
- Their eggs are covered with a hard protective covering.
Question 1:
Exons are gene fragments whose DNA sequence after transcription is found in mature mRNAs. This part of the gene is most often coding.
The size of the exons in the genomes follows a log-normal distribution, with an average length of about 150 nucleotides, knowing that in eukaryotes, each gene contains several exons and introns (an average of 8) so the size is 8*150 = 1200 bp.
Question 2:
Introns are fragment of a gene located between two exons. Introns are present in immature mRNA and absent in mature mRNA. "Non-coding" fragment of the gene.
The introns average in a gene is 3365 bp including 3'UTR and 5'UTR and intermediate introns.
Electron microscope‘s differ from light microscope’s in that they produce an image of specimen by using a beam of electrons rather than a beam of light. Electrons have such a shorter wavelength than visible light, and this allows electron microscope to produce higher resolution images than standard light microscope‘s
Hydrophobic is when it cannot dissolve in water and hydrophilic is when it can. an example is a phospholipid in the cell membrane- the the tails are hydrophobic and the heads are hydrophilic.
