Which of the following mechanisms best explains how xylem sap moves up against the downward pull of gravity?

A) cohesion-tension hypothesis
B) gravitropism
C) phototropism
D) expenditure of ATP


A

Biology & Microbiology

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List several functions of epithelial tissues

What will be an ideal response?

Biology & Microbiology

In the figure above, the two strands have

separated in step "b" because

a. the sugar-phosphate bonds were broken. b. the hydrogen bonds between bases were broken. c. energy from primers pushed the bases apart. d. the bases, being negatively charged, repelled each other. e. proteins were inserted between each pair of bases.

Biology & Microbiology

Members of which fungal phylum are the only ones to produce motile spores?

a. Glomeromycota b. Basidiomycota c. Chytridiomycota d. Zygomycota e. Ascomycota

Biology & Microbiology

Quaternary structure of a protein refers to ________

A) the sequence of amino acids in a polypeptide B) alpha-helical or beta-sheet arrangements of protein structure C) three-dimensional coil of a polypeptide around itself D) the association of multiple polypeptide subunits to form a functional protein E) the number of amino acids in a polypeptide chain

Biology & Microbiology