The letter “C” in the above figure represents

a. pericycle
b. endodermis
c. primary xylem
d. root cortex
e. primary phloem


Answer: e

Biology & Microbiology

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An allele frequency has changed within a population. What term describes this occurrence?

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The anticodon of the tRNA molecule base pairs with

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What is the free energy change for the inward movement of calcium ions into the bacterial cell?

A cell biologist interested in the transport of calcium ions (Ca2+) across the plasma membrane of bacterial cells made the following measurements on bacterial cells at 25°C: Vm = ?150 mV [Ca2+] outside = 20 mM [Ca2+] inside = 0.4 mM A) +4.6 kcal/mol; an endergonic reaction B) +4.6 kcal/mol; an exergonic reaction C) ?9.2 kcal/mol; an endergonic reaction D) ?9.2 kcal/mol; an exergonic reaction E) +9.2 kcal/mol; an exergonic reaction

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