单项选择题

The main purpose of these researchers is ______

A．to help to destroy old cells and boost new ones
B．to alter the natural process known as apoptosis
C．to find out ways to protect aging brain cells
D．to compare different levels of proteins

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热门试题

单项选择题

The result of the researches so far may help, as asserted by one of the researchers, ______

A．to prevent cardiovascular disease and cancer
B．to understand the processes that lead to cell death
C．to improve our memories
D．to do what we think is right

单项选择题

The rats fed unrestricted diets do NOT ______

A．have one preventing-aging protein increased
B．have their cell death increased or doubled
C．have their DNA fragmentation doubled
D．have the levels of proteins increased