The organism, Phytophthora infestans, responsible for the Irish Potato Famine of 1845 and 1847 belongs to 

A. Euglenozoa.
B. Alveolata.
C. Rhodophyta.
D. Chlorophyta.
E. Stramenopila.

E. Stramenopila.

Biology & Microbiology

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Crossing over between homologous chromosomes takes place during  

A.  prophase II. B.  prophase I. C.  interphase II. D.  interphase I. E.  metaphase II.

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Each weak acid has a characteristic pKa value defined as pKa = -logKa. What does the pKa tell you about the composition of the acid solution?

What will be an ideal response?

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The half life of Carbon 14 is approximately

____ years.

a. 16,000,000 b. 60,000 c. 8,200 d. 5,400 e. 500

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A chemical process that requires air (oxygen); phase of cellular respiration that requires oxygen.

What will be an ideal response?

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