1- Which of the following examples involves active transport? a) Release of calcium stored at high concentrations in the endoplasmic reticulum into the cytoplasm. b) Sodium ions (Na+) flowing into a cell through a channel protein. c) Transporting calcium out of a cell into an solution rich in calcium. d) Uptake of a hydrophobic dye newly placed in a solution by cells living in the solution. 2- Chemical analysis of a cellular membrane would normally reveal the presence of A) sugars B) proteins C) lipids D) nucleic acids E) A, B and C 3- If you place a culture of animal cells into a container filled with molecules of red dye that have a strong negative charge, and the dye ends up inside the cell, what is the most likely explanation for the uptake? a) osmosis b) active transport c) pinocytosis d) phagocytosis e) exocytosis
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Active transport involves the movement of molecules against their concentration gradient, which requires energy, usually in the form of ATP. a) Release of calcium stored at high concentrations in the endoplasmic reticulum into the cytoplasm - This is not active Show more…
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Which of the following is an example of active transport in a cell? Choose 1 answer: A Calcium passing through channel proteins, from a high to low concentration B Enzymes spreading evenly through cytoplasm C Oxygen entering the cell without the use of energy D Sodium moving out of the cell against its concentration gradient
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