8) What makes a liver cell a liver cell and not a brain cell? A)   The fact that it is found in an organ known as the liver B)   The cells next to the liver cell dictate its identity C)   The specific genes that the liver cell contains D)   The specific genes that the liver cell expresses   7) The membranes of mictochondria, chloroplasts, and bacteria do all of the following except A)   Pump ions against concentration gradients B)   Generate ATP C)   Generate chemical gradients D)   Catalyze the reaction of the krebs cycle

Q2

The endomembrane system is responsible for O a) Synthsize molecule O b) transport cell products c) secrete material found d) digestion of matter e) All of the above

Which antibiotic affects cell wall synthesis?a)streptomycin b) erythromycin c) tetracycline d)penicillin

The commonly prescribed antibiotic Clindamycin blocks the peptide bond formation between amino acids during protein synthesis. This would happen during     A) transformation.     B) translation.     C) transcription.     D) replication.     E) mitosis.

29 Which kind of macromolecule is regarded as a good candidate for the original self-replicator (or genetic molecule)  because it can both cause dehydration synthesis and encode information efficiently? a) Neurotransmitter                     b) DNA               c) Hormones                       d) Proteins             e) RNA

34- What is the function of the cytoplasmic streaming in a cell? a) Cellular respiration b) Cellular communication c) Cell division d) Movement of organelles and nutrients within the cell 35- Which organelle is responsible for regulating the levels of calcium ions in a cell? a) Nucleus b) Golgi apparatus c) Endoplasmic reticulum d) Mitochondria 36- What is the function of the peroxisome in a cell? a) Synthesis of lipids b) Detoxification of harmful substances c) Protein synthesis d) Storage of genetic information ۷۵ / ۱۳ 37- Which organelle is responsible for the synthesis of RNA molecules? a) Nucleus b) Ribosome c) Golgi apparatus d) Vacuole 38- What is the function of the cytoplasmic vesicles in a cell? a) Energy production b) Transport of molecules within the cell c) Intracellular digestion d) Synthesis of proteins

Cytokinesis in plant cells is different than cytokinesis in animal cells. a)  Explain why it has to be different, andb)  briefly describe the processes in the two different cell types.

15- Which organelle is known as the "powerhouse" of the cell due to its role in producing energy? a) Nucleus b) Lysosome c) Vacuole d) Mitochondria 16- What is the function of ribosomes in a cell? a) Storage of genetic information b) Synthesis of proteins c) Breakdown of waste materials. d) Synthesis of lipids 17- Which of the following is NOT a function of the nucleus in a cell? a) Storage of genetic information b) Control of cell activities c) Synthesis of proteins d) Reproduction of the cell 18- Which organelle is responsible for packaging and sorting proteins for transport within the cell or secretion outside the cell? a) Endoplasmic reticulum b) Nucleus c) Golgi apparatus d) Vacuole 19- What is the function of the cytoskeleton in a cell? a) Cellular respiration b) Cellular communication c) Cell division. d) Structural support and cell movement

For which of the following apply: the extracellular space is eliminated here near the surface between two cells. A) Zonula adherens B)Zonula  occluded C) Desmosome D) Gap junction E) Hemidesmosome