Theoretically, which two of the following present the richest potential sources of silica?

1.  marine sediments consisting of foram tests

2.  marine sediments consisting of diatom cases (valves)

3.  marine sediments consisting of radiolarian shells

4.  marine sediments consisting of dinoflagellate plates

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#Question id: 10501

#XL - R Botany

Which defenses require specific detection systems and signal transduction pathways that can sense the presence of an herbivore or pathogen and alter gene expression and metabolism accordingly

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#Question id: 15562

#XL - S Microbiology

Deletion of which gene not only was accompanied by the abolition of antibiotic formation but also severely impaired growth on agar media.

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#Question id: 8689

#XL - T Zoology

Which of the following statements best describes the rationale for applying the principle of maximum parsimony in constructing phylogenetic trees?

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#Question id: 3792

#XL - Q Biochemistry

Strain introduced by unwinding DNA at the replication forks is relieved by

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#Question id: 11304

#XL - Q Biochemistry

In what way do the membranes of a eukaryotic cell vary?