Question: In a plant cell, which organelle contains DNA and ribosomes? Golgi apparatus Mesophyll Leucoplast Endoplasmic reticulum Mitochondrion Exosome
Answer Choices:
Answer: Mitochondrion
Question: Which of the following organelles provides evidence for the endosymbiont theory? Ribosomes Smooth endoplasmic reticulum Golgi apparatus Centrosomes Flagella Ribosomes
Answer Choices:
Answer: Ribosomes
Question: Which of the following molecules requires facilitated diffusion to cross the plasma membrane? Chloride ions Steroids Urea Water Carbon dioxide gas Chloride ions
Answer Choices:
Answer: Chloride ions
Question: Lipids serve many functions in cells. Which of the following is not one of them? Nucleotides Energy storage Membranes Nucleotides Vitamins Signaling
Answer Choices:
Answer: Nucleotides
Question: Replacing saturated fats with unsaturated fats in the plasma membrane would lead to A more fluid membrane at 37 degrees Celsius. A less fluid membrane at 37 degrees Celsius. A more fluid membrane at 25 degrees Celsius. No change in fluidity due to the presence of cholesterol. Fewer transmembrane proteins. A lower risk of some diseases.
Answer Choices:
Answer: A more fluid membrane at 37 degrees Celsius.
Question: Increasing the activity of phospholipase C would have which of the following effects? An increase in the cytosolic Ca²⁺ concentration. An increase in the cytosolic Ca²⁺ concentration. A decrease in the GTPase activity of G proteins. An increase in the concentration of IP₃. Trigger binding of ligands to GPCRs. A decrease in the concentration of IP₃.
Answer Choices:
Answer: An increase in the cytosolic Ca²⁺ concentration.
Question: Which structure-function pair is mismatched? Smooth endoplasmic reticulum: phagocytosis Lysosome: intracellular digestion Smooth endoplasmic reticulum: phagocytosis Ribosome: protein synthesis Golgi apparatus: vesicle trafficking
Answer Choices:
Answer: Smooth endoplasmic reticulum: phagocytosis
Question: Which of the following would one NOT expect to find inside the nucleus? Collagen DNA RNA Ribosome Collagen The sodium-potassium pump
Answer Choices:
Answer: The sodium-pot assium pump
Question: In which two locations would you expect to find similar Ca²⁺ concentrations? The ER lumen and the extracellular space. The ER lumen and the cytoplasm. The ER lumen and the nucleus. The ER lumen and the mitochondrial matrix. The extracellular space and the cytoplasm. The nucleus and the extracellular space.
Answer Choices:
Answer: The ER lumen and the extracellular space.
Question: Which of the following base sequences will form a short stretch of a DNA double helix? 5′-GCGCGC-3′ with 5′-GCGCGC-3′ 5′-ATGCAT-3′ with 5′-TACGTA-3′ 5′-GTATAC-3′ with 5′-CATATG-3′ 5′-GCGCGC-3′ with 5′-CGCGCG-3′ 5′-AAAAAA-3′ with 5′-UUUUUU-5′ 5′-GCGCGC-3′ with 5′-CGCGCG-3′
Answer Choices:
Answer: 5′-GCGCGC-3′ with 5′-CGCGCG-3′
Question: The endomembrane system consists of all of the following except Endosome Nuclear envelope Lysosome Golgi apparatus Peroxisome
Answer Choices:
Answer: Peroxisome
Question: Which of the following is a characteristic feature of carrier (transport) proteins? They require cells to expend energy via transport. They have specific binding sites for the molecule they transport. They have few, if any, hydrophobic amino acids. They move molecules against their concentration gradient. They are specific for the molecule they transport. They are peripheral membrane proteins.
Answer Choices:
Answer: They move molecules against their concentration gradient.
Question: Which statement about IP3 is false? IP3 is a relay protein in the GPCR pathway. IP3 is a relay protein in the GPCR pathway. IP3 regulates calcium release from the endoplasmic reticulum. IP3 is cleaved from PIP2. IP3 is a second messenger in the Tyrosine-kinase receptor pathway. IP3 and DAG are found in equal concentrations in the cell.
Answer Choices:
Answer: IP3 is a second messenger in the Tyrosine-kinase receptor pathway.
Question: Glucose diffuses very slowly through the phospholipid bilayers of a membrane. The cells lining the small intestines, however, rapidly move large quantities of glucose from the glucose-rich lumen of the intestine into their glucose-poor cytoplasm. Using this information, which transport mechanism is used by these intestinal cells? Simple diffusion Phagocytosis A receptor system Exocytosis Facilitated diffusion
Answer Choices:
Answer: Facilitated diffusion
Question: The phosphate transport system in some cells moves phosphate into the cell even when the concentration of phosphate outside the cell is much lower than that in the cytoplasm. This phosphate transport requires a pH gradient across the membrane—more acidic (protons) outside the cell than inside the cell. Phosphate transport is most likely a specific example of Secondary active transport Passive diffusion
Answer Choices:
Answer: Secondary active transport
Question: The optimal distribution policy strikes that balance between current dividends and capital gains that maximizes the firm’s stock price. True False
Answer Choices:
Answer: True
Question: Other things held constant, the higher a firm’s target payout ratio, the higher its expected growth rate should be. True False
Answer Choices:
Answer: False
Question: Miller and Modigliani’s dividend irrelevance theory says that the percentage of its earnings a firm pays out in dividends has no effect on either its cost of capital or its stock price. True False
Answer Choices:
Answer: True
Question: Miller and Modigliani’s dividend irrelevance theory says that the percentage of its earnings a firm pays out in dividends has no effect on its cost of capital, but it does affect its stock price. True False
Answer Choices:
Answer: False