The world human population has increased dramatically during the past few centuries due to:
a. increased immigration.
b. increased emigration.
c. decreased death rates.
d. increased birth rates.
e. decreased birth rate
c
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Much of the genetic variation seen in the human population is neutral
A. true B. false
Which one of the following statements about archaeans is false?
A) Archaeans are more closely related to eucaryotes than they are to bacteria. B) Both archaeans and bacteria are procaryotic organisms. C) Some archaeans live in extremely hot environments. D) The cell walls of archaeans contain a thicker layer of peptidoglycan than the cell walls of bacteria.
Active transport occurs ________ the concentration gradient across a cell membrane.
A. against B. towards C. away from D. in between E. passively against
The action of a new drug is unknown, so you test various aspects of eukaryotic cell processes looking for an effect. You notice that the survival of cells exposed to this drug is very low. Further analysis shows that some proteins and mRNAs are much longer than they should be. One hypothesis is that the drug interferes with
A) transcription termination signals. B) spliceosome activity. C) ribosomes. D) nucleoli. E) both choices A and B