Which of the following is NOT required for passive transport?

A. membranes
B. concentration gradients
C. molecules
D. bilayers
E. energy


Answer: E

Biology & Microbiology

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The exchange of genetic material during crossing over causes which of the following?

A) genetic variation B) stasis C) heterozygosity D) homozygosity

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Tumors that arise from mesenchymal cell types are called

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The immunoglobulin class that has a dimer form found in mucus, saliva, colostrum, and other body secretions is

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