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Mammals cannot digest cellulose and therefore cannot directly obtain glucose from wood. █████████ ████ ████████ ███ ████ █████████ ███ █████████ ██ ████ ██████ ████████ █████████ ███ ████████ ██ █████ ███ █ ████ ██ ███████ ██████ █████████████ ███████████ ████████ ████ ███████ █████ ██ █████████ █████ ████████ ██ ███████ ███ ██████ ██ █████████ ██████ ██ ████████ ███ ███ █████████ ████████ ██ ████████████ █████████ ██ ███ ██████ ██ █████████ ██████████ █████ ████████ ███████ █████ ██████ ███ ██ ███████ ██████ █████ ████████ ███ ██ ██████████ ███████████ █████████
Summary
Mammals cannot absorb glucose from wood because they cannot digest cellulose. However, mushrooms can digest cellulose and some mushrooms use it to make branches of polymers that form a type of glucose called beta-glucans. Beta-glucan extracts from some types of mushrooms prevent cancerous tumors from growing in mammals. This antitumor activity increases as the degree of branching increases. Beta-glucan extracts kill cancer cells by increasing immune-cell activity, not by killing cancer cells directly.
Strongly Supported Conclusions
The more branching that occurs in the production of beta-glucans, the stronger the effect of increasing immune-cell activity.
24.
Which one of the following ██ ████ ████████ █████████ ██ ███ ███████████ ██████
a
Mammals obtain no ██████████ ██████ ███████ ████ ██████ ██████████
b
If extracts from █ ████ ██ ████████ █████ ████████ ██ ███████ ███ ██████ ██ █████████ ██████ ██ ████████ ████ ███ ████████ ██ ███████ ██ █████ █████████ ██ ████ █████████████
c
The greater the ██████ ██ █████████ ██ █████████████ ███ ███████ ███ ██████ ██ ███████████ ████████ ██ ████████ ██ ████████
d
Immune-cell activity in ███████ ████ ███ ███████ █████ ██████ ██ ███████ ██████ ██████
e
Any organism capable ██ █████████ ███████ ████ ████ ███ ███ █████████ ██ ████ █████████████