The quick response of the immune system to a second infection is due to the _____, a feature of the immune system as
demonstrated by the success of vaccines.
a. activation of macrophage cells
b. suppression of suppressor cells
c. T and B memory cells
d. high levels of antigen
e. new cytotoxic T cell.
c
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Homo erectus _____
a. was the earliest member of the genus Homo b. was one of the australopiths c. evolved in Africa and dispersed to many regions d. disappeared as the result of an asteroid impact
A given enzyme
a. can be used for many different kinds of chemical reactions. b. is permanently changed during a chemical reaction. c. has a special site where the products bind before the reaction begins. d. increases the rate of a particular reaction.
Cyanobacteria such as Synechococcus and Prochlorococcus are predominate members of the phytoplankton in illuminated surface waters.
Answer the following statement true (T) or false (F)
When are histones phosphorylated?
What will be an ideal response?