There are at least three different types of companion cells in the minor veins of mature, exporting leaves. Which of the following statements about these companion cells is CORRECT?

 a.) transfer cells are transport sugars enter the apoplast during the movement of sugars from mesophyll cells to sieve elements. Transfer cells transport sugars from the apoplast to the symplast of the sieve elements and companion cells in the source.

 b.) the numerous mitochondria in companion cells may supply energy as ATP to the sieve elements

 c.) Ordinary companion cells can function in either symplastic or apoplastic short-distance transport in source leaves, depending in part on plasmodesmatal frequencies

 d.) Intermediary cells, by contrast, function in symplastic transport of sugars from mesophyll cells to sieve elements

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#Question id: 15726

#Section 6: Plant, Animal and Microbial Biotechnology

Tissues and cells cultured in a liquid medium produce culture of single cells and cells clumps of few to many cells

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#Question id: 553

#Section 2: General Biology

The concept of “induced fit” refers to the fact that:

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#Question id: 16829

#Section 1: Engineering Mathematics

Perform the following operations on the matrix

 

i) Add the third row to the second row

ii) Subtract the third column from the first column. The determinant of the resultant matrix is 

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#Question id: 2337

#Section 3: Genetics, Cellular and Molecular Biology

Centrioles may have originated as

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#Question id: 2281

#Section 3: Genetics, Cellular and Molecular Biology

Enzymes embedded in the membrane of the smooth ER