Sister chromatids are joined at the centromere in all of the stages of meiosis listed below except

a. metaphase II.
b. anaphase II.
c. telophase I.
d. metaphase I.
e. prophase II.


b

Biology & Microbiology

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Why would the presence of a specific type of keratin, an intermediate filament protein, in the bloodstream or lymph node be an indicator of metastasis of tumor cells?

A. Intermediate filaments are only found in tumor cells. B. Keratin is only present if its specific cell type is also present. C. Intermediate filament proteins cause cells to clump together. D. Answers b and c are both correct.

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True-breeding tall snapdragons with red flowers were crossed with short snapdragons with white flowers. The resulting F1 progeny were all of medium height and had pink flowers

When the F1 progeny are crossed with each other, what proportion of the F2 progeny would be of medium height and have pink flowers? A. 1/4 B. 1/2 C. 1/8 D. 1/16 E. 3/4

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What is the definition of osmosis?

A) The movement of molecules down their concentration gradient B) The movement of salt molecules across a semipermeable membrane C) The diffusion of water molecules across a semipermeable membrane D) The movement of molecules against their concentration gradient

Biology & Microbiology

Which chamber of the heart receives blood from the lungs?

A) right atrium B) left ventricle C) left atrium D) right ventricle

Biology & Microbiology