Bio 100 Exam 2 Spe 2018 MULTIPLE CHOICE·Choose the one alternative that best com
ID: 207832 • Letter: B
Question
Bio 100 Exam 2 Spe 2018 MULTIPLE CHOICE·Choose the one alternative that best completes the statement or answers the question. 1) A form of diffusion in which the molecules pass through a protein instead of between the phospholipids is A) facilitated diffusion C) osmosis B) diffusion D) active transport 2) Which of these processes brings into the cell large macromolecules and particles by the formation of a vesicle in the outer membrane? B) endocytosis D) exocytosis C) pinocytosis 3) Microfilaments are made of B) tubulin D) phospholipids A) actin 4) Cilia and flagella are both made of B) tubulin D) phospholipids A) actin 5) Which of these is most abundant in the plasma membrane? A) proteins C) cholesterol D) phospholipids 6) If a liver cell were to be placed in a beaker with a solution containing the same solute concentration as that found inside the cell, we would say that the beaker contained a(n) A) heterotonie B) hypertonic C) isotonic D) hypotonie 7) You have a bacterial infection. Your immune system will be able to distinguish this foreign invader from other cells by A) recognizing cell adhesion molecules (CAMs) B) finding glycolipids on the plasma membrane C) identifying glycoproteins on the plasma membrane D) determining the presence or absence of a nucleus 8) When bacteria appear in tissues, a type of large cell engulfs and destroys them. Which process are these cells using to engulf the bacteria? A) exocytosis B) active transport D) phagocytosis ) Which of the following is a membranous organelle that chemically modifies and ships proteins to other organelles or out of the cell? A) lysosome B) chloroplast C) mitochondria D) Golgi complex 10) Most of the energy used by the cell is converted to ATP in A) lysosomes B) Golgi complexes C) nuclei D) mitochondriaExplanation / Answer
1) Ans: facilitated diffusion(a); It is passive transport in which the ions or molecules pass the bilayer through the transmembrane integral protein. Polar and large molecules which cannot pass through by diffusion depends on thes transmembrane proteins for crossing the membrane. Diffusion is defined as the flow of molecules or atoms from its higher tolower cooncentration.Osmosis is defined as the movement of solvent from its higher concentration to its lower concentration through a semipermeable membrane.In active transport, the movement occurs from the lower to higher concentration of molecules or ions with the expenditure of energy.
2) Ans: Endocytosis(B) through endocytosis cell brings macromolecules into the cell by engulfing in vescicle by the expenditure of energy. Exocytosis is counterpart of endocytosis through which cell transort molecules and neurotramitter to the outside of the cell. Through pinocytosis, the cell brings the molecules dissolved in the extracellular fluid.
3) Ans: Actin(A) Microfilaments forms the cytoskelton in eukaryotic cells, it is composed of actin. microfilaments are also known as actin fibers. Actin is the most abundant cellular protein.
4) Ans:Tubulin(B) Cilia and flagella are composed of dyenin(a motor protein)and microtubule,which are made of tubulin. Cilia and flagella are motile cellular appendages,which help in movement of cell.
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