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
Answer: D
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Which of the following is NOT a function of transposase?
A. Transposase recognizes inverted repeats. B. Transposase cleaves at both ends of the transposable element. C. Transposase carries the transposable element to a new site on the DNA. D. Transposase cleaves the target DNA at staggered sites. E. Transposase ligates nucleic acid fragments during DNA replication.
There are, currently, approximately how many named extant species of plants?
a. 12,000 d. 1,200,000 b. 120,000 e. 2,600,000 c. 260,000
What is the term for chromosomes that do not reshuffle the alleles of linked genes?
What will be an ideal response?
Epigenetic modifications affect the nucleotide sequence of the DNA
a. True b. False