Which of the following best describes the significance of the tata box in eukaryotic promoters?

a) it is the recognition site for a specific transcription factor.
b) it sets the reading frame of the mrna.
c) it prevents supercoiling of the dna near the start site.
d) it is the recognition site for ribosomal binding.
e) its significance has not yet been determined.

The correct option is A.

Explanation:

TATA box refers to a  non coding sequence of DNA that is found in the promoter regions of eukaryotic genes. The TATA box serves as the binding sites for certain proteins and some transcriptions factors in eukaryotic genes; it signifies the points where transcription begins. Transcription is the process by which the genetic information in DNA is replicated into an mRNA. This is the first step in protein synthesis.  The name TATA was derived from the nucleotide bases that are always present in large number a the site. T stands for thymine while A represents the adenine base.  

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answer:

the water molecules are transferred from the roots to the stem or top parts of the tall tree because of important properties of water which are adhesion, cohesion and capillary action. cohesion is the property of water molecules keeps water molecules in a combined state by sharing of bonds between them at the atomic level. adhesion allows the interaction of water molecules with other substances or substrate. adhesion will cause the attachment of water molecules to the wall of the vessel (xylem) of the plant. capillary action occurs when the adhesive force to the vessel wall is stronger than the cohesive force between water molecules. capillary action mimics the transfer of water from a tube or pipe. in this way water utilizes its property to transfer water from down to top level of the plant.