The letter “C” in the above figure represents
a. pericycle
b. endodermis
c. primary xylem
d. root cortex
e. primary phloem
Answer: e
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The cytoplasmic proteins of Halobacterium are
A) highly acidic. B) highly basic. C) generally neutral. D) variable, depending on the species.
An allele frequency has changed within a population. What term describes this occurrence?
a. microevolution b. population evolution c. population drift d. macroevolution e. allele driven evolution
The anticodon of the tRNA molecule base pairs with
a. DNA. b. mRNA. c. amino acids. d. polypeptides. e. rRNA.
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