All of the following are true of every cell of the early
human embryo EXCEPT that
a. each has the same genes as all the others.
b. each can give rise to an entire human.
c. they are undifferentiated.
d. all will differentiate alike.
e. all have maternal messages.
Answer: d
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Agrobacterium infects plants and causes them to form tumors. You determine that tumor formation requires a large amount of the plant's energy for tissue formation. How might this change the number of offspring a plant produces
, and what is the most likely explanation for this change? A) The number of offspring should increase, because in general, illness increases the reproductive output of organisms. B) The number of offspring should increase, because the bacteria will provide energy for the plant. C) The number of offspring should decrease, because the plant will divert energy from reproduction to tumor formation. D) There should be no effect of infection on offspring production because energy for reproduction is independent of infection.
Cold and freezing are very effective in killing bacteria
Indicate whether this statement is true or false.
Attachment of a bacteriophage to its host requires
A. specific surface proteins on the bacteriophage and specific receptor molecules on the host cell. B. nucleic acid protein interactions. C. specific receptor molecules on the host cell. D. specific surface proteins on the bacteriophage.
All Old Order Amish families from Lancaster County with Ellis-van Creveld syndrome can trace their genealogies to Mr. and Mrs. Samuel King, who immigrated to Lancaster County in 1744. This is an example of __________
A) founder effect B) mutation C) gene flow D) Hardy-Weinberg equilibrium E) bottleneck effect