Answer:
4, 2, 3, 1 from top to bottom.
Answer:
As light intensity increases to 800 (units), the rate of photosynthesis also increases. This is because a higher light intensity results in an increased rate of the light dependent reaction. However, when light intensity increases above 800, the rate of photosynthesis remains constant. This is because the light intensity is no longer the limiting factor, meaning that something else must be limiting the rate of photosynthesis. This could be carbon dioxide concentration or water availability. CO2 is required for the light independent stage of photosynthesis (the Calvin cycle) whereas water is required to produce H+ and e- for the electron transport chain.
Explanation:
I hope this would be enough to get the 4 marks. The main point is that the rate does not increase each time light intensity increases, because there is a limiting factor that is affecting the rate of the light independent reaction.
<span>C. neutral, with the number of protons equaling the number of electrons.
is the right answer
because number of neutrons vary from atom to atom</span>
Answer:
E. All of these mechanisms are used; there is no single universal mechanism.
Explanation:
Gene expression is regulated at many levels. Some of them are:
- Chromatin remodeling regulation includes altered histone modifications such as methylation which can regulate gene expression (up or down).
- Transcription is regulated via transcriptional factors and specificity factors such as repressors and activators.
- RNA processing can be regulated through the alternative splicing (different introns can be excised and combinations of different exons connected)
- Post-translational modification refers to modification of proteins after being synthesized.
CDNA does not have introns and therefore can be expressed in prokaryotic cells. cDNA libraries are most useful in reverse genetics where the additional genomic information is less use. Also, it is useful for subsequently isolating the gene that codes for that mRNA.