How is a eukaryotic cell different from a prokaryotic cell?
Ans: It has a nuclear membrane
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N2 is an end product of ______________; NH3 is an end product of _______________
A. anammox; nitrogen fixation B. nitrogen fixation; anammox C. denitrification; anammox and nitrogen fixation D. anammox and denitrification; nitrogen fixation
Homo erectus and the modern humans differ in
A. social behavior. B. living as tribes. C. their brain size. D. their upright posture. E. opposable thumbs.
In a lichen, the photobiont usually receives
a. nutrients. b. protection from herbivory. c. aid in sexual reproduction. d. enhanced dispersal of offspring. e. shelter from radiation and desiccation.
After reaching the inner ear, the frequency of a sound primarily affects
A. the vibrational amplitude of the tectorial membrane. B. the location of the greatest basilar membrane vibration. C. the amplitude of basilar membrane vibration.