What portion of an illuminated plant cell would you expect to have the lowest pH?
a. nucleus
b. cytosol
c. chloroplast
d. stroma of chloroplast
e. thylakoid space
Ans: e. thylakoid space
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Using the NeoR/Tk system of introducing gene replacements into mice (as described in the text), which of the following would identify those mouse cells that were the result of homologous recombination?
A. NeoR only B. Tk only C. NeoR and Tk D. Neither NeoR or Tk
Gene flow
a. increases genetic diversity b. decreases genetic diversity c. has no effect on genetic diversity
What are the name of bacteria that are round with a thick wall?
A. Gram - bacilli B. Gram - cocci C. Gram + bacilli D. Gram + cocci
How many other bands of sea-floor crust in the figure above have the same magnetic polarity as the crust that directly straddles the rift valley?
A) two bands B) four bands C) five bands D) eight bands