The first step of the calvin cycle is the incorporation of into
a) o2… g3p
b) rubp… o2
c) co2… rubp
d) g3p… rubp

The correct answer is: C) CO2… RuBP

Calvin cycle is the second phase of photosynthesis also called light-independent reactions (no light required for this step). This process occurs in in the stroma (the inner space of chloroplasts) and during it three-carbon sugars are produced from CO2. Calvin cycle can be divided into three steps:

1.Carbon fixation where CO2 from the air is “apsorbed” by plants and combined with a five-carbon acceptor molecule, ribulose-1,5-bisphosphate (RuBP). Formed molecule with 6 C atoms is then split into two 3-phosphoglyceric acid (3-PGA) molecules by the enzyme rubisco.

2.Reduction refers to conversion of 3-PGA to glyceraldehyde-3-phosphate (G3P), sugar that can be used in further steps of photosynthesis.

3.Regeneration refers to recycle of some G3P in order to regenerate the RuBP acceptor for the carbon fixation.

the right answer is a. skin cells forming from sunlight.

the liver is an organ endowed with a fantastic ability to regenerate

. thus, if a hepatectomy (ablation) of 70% of the hepatic mass is performed in the rat, there is complete recovery in 7 to 10 days.

prokaryotes are beings that have existed since the existence of life on earth, and do not come from another realm.

ribosomes are organelles that exist naturally in eukaryotes, either in free form or attached to the endoplasmic reticulum.

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