Major types of alkaloids, their amino acid precursors, and well-known examples of each type;

Alkaloid class	Biosynthetic precursor	Examples
A. Pyrrolidine	i. Lysine	a. Coniine
B. Tropane	ii. Ornithine	b. Retrorsine
C. Piperidine		c. Lupinine
D. Pyrrolizidine		d. Nicotine
E. Quinolizidine		e. Atropine and Cocaine

Which of the following combination from the given table is correct?

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#Question id: 7210

#Unit 5. Developmental Biology

Model for limb patterning by opposing gradients of retinoic acid (blue shading) and of FGFs and Wnts (pink shading). According to this graph, Which of the following statements are correct?

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#Question id: 3444

#Unit 11. Evolution and Behavior

Which of the following is least related to the others?

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#Question id: 28748

#Unit 2. Cellular Organization

In plant cells, two types of peroxisomes are present;

I- present in leaves

II- present in germinating seeds

a) that participates in photosensory biology

b) that participates in photorespiration

c) that converts fatty acids into sugars

d) that converts fatty acids into long-chain acyl-CoA  and glycerol

Which of the following statements is correct match from given information;

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#Question id: 26970

#Unit 10. Ecological Principles

There are some given Density independent factors, except?

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#Question id: 12909

#Unit 13. Methods in Biology

According to the diagram, arrange the steps in correct order: 

1. DNA is then digested by the Cas9 nuclease at specific points on both DNA strands. 

2. Homologous recombination to repair the break and incorporate the new DNA sequence then follows. 

3.The nuclease Cas9 is targeted to DNA by a guide RNA consisting of a specific 20 nucleotide spacer/targeting sequence (crRNA).

 4. That identifies the DNA to be modified, linked to a trans-activating (tracrRNA) sequence necessary for the recruitment and stability of Cas9 nuclease.