There are more species in tropical areas than in places more distant from the equator. This is probably a result of

a) more predators and parasites

b) more dispersed annual solar radiation compared to the poles

c) more frequent ecological disturbances over a longer time span

d) a longer time frame without disturbances for evolution and speciation

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#Question id: 23658

#Unit 13. Methods in Biology

How many recombinant clones must be screened in order to be 99% certain that a particular gene is found in a YAC library of human DNA where the average size of an insert is 500 kbp? The human genome size is about 3.2 x 10⁶ kbp. 

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#Question id: 23693

#Unit 13. Methods in Biology

the DNA fragments making up a genomic library are generally contained in

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#Question id: 12226

#Unit 10. Ecological Principles

Which  of  the  following  types  of  species interaction is  correctly paired with  its  effects  on  the  density  of  the  two interacting populations?

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#Question id: 27383

#Unit 1. Molecules and their Interaction Relevant to Biology

Choose the correct statement related to the atomic size Cl and Mg

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#Question id: 24489

#Unit 3. Fundamental Processes

Two transesterification reactions takes place for 2 exon -1 intron configuration. Choose the correct  statement 

a. First transesterification is always caused by exon 1 -3’OH

b. second transesterification is catalysed variably either by external G or branch point while .

c. First transesterification is catalysed variably either by external G or branch point while 

d. second transesterification is always caused by exon 1 -3’OH.