Companion cells transport of photosynthetic products from producing cells in mature leaves to the sieve elements in the minor veins of the leaf. There are at least three different types of companion cells in the minor veins of mature, exporting leaves, All three cell types have dense cytoplasm and abundant mitochondria;

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#Question id: 32135

#Unit 1. Molecules and their Interaction Relevant to Biology

The net charge on a nucleoside monophosphate is 

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#Question id: 8948

#Unit 9. Diversity of Life Forms

What distinguishes a coelomate animal from a pseudocoelomate animal is that coelomates

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#Question id: 11874

#General Aptitude

The least number which when divided by 16, 18, 20 and 25 leaves 4 as remainder in each case but when divided by 7 leaves no remainder is

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#Question id: 5829

#Unit 8. Inheritance Biology

Transitions are base pair substitutions where:

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#Question id: 5523

#Unit 5. Developmental Biology

Ectodermal cells condense into placodes that change into