Cell cycles of early embryonic animal cells are unusual because they have
a. no G1 or G2.
b. an elongated G1 and G2.
c. a short S.
d. a much shortened M.
Ans: a. no G1 or G2.
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If Escherichia coli is cultured in broth containing both glucose and lactose, it
A. uses lactose preferentially until the supply is exhausted, then uses glucose. B. uses glucose preferentially until the supply is exhausted, then uses lactose. C. uses only the glucose (it cannot use lactose as a source of carbon). D. uses glucose and lactose simultaneously.
Destruction of the motor areas in the left cerebral cortex results in the loss of:
a. sensation on the right side of the body b. sensation on the left side of the body. c. voluntary movement on the left side of the body d. voluntary movement on the right side of the body e. the ability to speak
Clonal selection requires the presence of foreign antigens.
Answer the following statement true (T) or false (F)
Today, gene swapping between two species is
A. infrequent but possible; it happened more often in the distant past. B. much more frequent compared to in the distant past. C. impossible, but it happened frequently in the distant past. D. only possible if they are in the same family of organisms, such as lions and tigers.