After fertilization of an egg the totipotent cell divides and the cells begin to specialize. These 30—40 cells are called ________ and are pluripotent
A) embryonic stem cells B) germ line cells
C) somatic cells D) T cells
Answer: A
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How are B-cell receptors different from antibodies?
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Actual assembly of sugars during
photosynthesis a. occurs during light-independent reactions. b. takes place in the stroma. c. requires NADPH. d. requires ATP. e. does all of these.
What are the steps toward multicellularity, in the correct order?
A) Some cells become gametes, then a colony forms, and finally some cells start to specialize. B) First a colony of protists forms, then some become gametes, and finally others specialize in various tasks. C) Some protists start to specialize for specific tasks, then they form a colony with specialists, and finally some specialists become gametes. D) First a colony of protists forms, then some protists start to specialize in specific tasks, and finally some cells become gametes.
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) either transcription termination signals or spliceosome activity.