Match the transposition pathway with its correct description. Answers may be used more than once or not at all. 1. Retrotransposon pathway
2. Direct cut pathway
3. Cut and paste pathway
4. Replicative pathway
Transcription pathway
A. Involves removing a segment of DNA and placing it in a new location; the number of TE is not increased.
B. Involves the copying of DNA.
C. Involves the translation of proteins.
D. N/A E. Involves an RNA intermediate and the reverse transcriptase enzyme

1. Retrotransposon pathway: E. Involves an RNA intermediate and the reverse transcriptase enzyme

3. Cut and paste pathway: A. Involves removing a segment of DNA and placing it in a new location; the number of TE is not increased.

5. Transcription pathway: B. Involves the copying of DNA.

4. Replicative pathway: C. Involves the translation of proteins.  

2. Direct cut pathway: D. N/A

Explanation:

Class I transposable elements (also known as retrotransposons) are genetic mobile elements that copy and paste into other loci by reverse transcription and integration of the cDNA into new genomic regions

Class II transposable elements (also known as DNA transposons), can move by two different mechanisms of transposition:: 1-cut-and-paste pathway: the DNA transposon leaves one locus and integrates into another genomic site. and 2-replicative pathway: the DNA transposon remains in one locus while new copies of its sequence are mobile. The replicative pathway requires a transposase enzyme that acts as a catalyst of transposition.

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.