Molecular Cell Biology, Study guides, Class notes & Summaries

Which of the following statements about archaea is FALSE? A) They are prokaryotes. B) Some produce methane from carbon dioxide and hydrogen. C) They lack peptidoglycan in their cell walls. D) Some are thermoacidophiles; others are extreme halophiles. E) They evolved before bacteria. - CORRECT ANSWER-E) They evolved before bacteria. Which of the following characterizes the Domain Bacteria? A) prokaryotic cells; ether linkages in phospholipids B) complex cellular structure...

1. Imagine that you have added the ER retention (KDEL) signal to the C-terminus of a cytoplasmic protein. If the gene was expressed in a cell, predict the final location in which your protein will localize. a. Mitochondria b. ER c. Cytoplasm d. Nucleus: Cytoplasm 2. 2. Which of the following protein is responsible for the ATP dependent uncoating of the clathrin from the nascent vesicle? a. Adaptin b. Hsc 70 c. Rab d. t-SNARE: Hsc 70 3. 3. Coat proteins such as Clathrin would dissociate...

For a protein to be an integral membrane protein, it would have to be _____. - CORRECT ANSWER-amphipathic, with at least one hydrophobic region You have a planar bilayer with equal amounts of saturated and unsaturated phospholipids. After testing the permeability of this membrane to glucose, you increase the proportion of unsaturated phospholipids in the bilayer. What will happen to the membrane's permeability to glucose? - CORRECT ANSWER-permeability to glucose will increase According to...

Both multicellular plants and animals have _____________________. (a) cells capable of locomotion. (b) cells with cell walls. (c) a cytoskeleton composed of actin filaments, microtubules, and intermediate filaments. (d) tissues composed of multiple different cell types. - CORRECT ANSWER-d Which of the following statements about plant cell walls is true? (a) The microtubule cytoskeleton directs the orientation in which cellulose is deposited in the cell wall. (b) The molecular components...

20-1 Both multicellular plants and animals have _____________________. (a) cells capable of locomotion. (b) cells with cell walls. (c) a cytoskeleton composed of actin filaments, microtubules, and intermediate filaments. (d) tissues composed of multiple different cell types. - CORRECT ANSWER-D 20-3 Which of the following statements about plant cell walls is true? (a) The microtubule cytoskeleton directs the orientation in which cellulose is deposited in the cell wall. (b) The molecular ...

18-1 The four phases of the cell cycle, in order, are G1, __________________, __________________, and __________________. A cell contains the most DNA after __________________ phase of the cell cycle. A cell is smallest in size after __________________ phase of the cell cycle. Growth occurs in __________________, __________________, and __________________ phases of the cell cycle. A cell does not enter mitosis until it has completed __________________ synthesis. DNA M protein G1 nu...

16-1 Cell lines A and B both survive in tissue culture containing serum but do not proliferate. Factor F is known to stimulate proliferation in cell line A. Cell line A produces a receptor protein (R) that cell line B does not produce. To test the role of receptor R, you introduce this receptor protein into cell line B, using recombinant DNA techniques. You then test all of your various cell lines in the presence of serum for their response to factor F, with the results summarized in Table Q16-1...

11-1 Which of the following phenomena will be observed if a cell's membrane is pierced? (a) the membrane reseals (b) the membrane collapses (c) a tear is formed (d) the membrane expands - CORRECT ANSWER-A 11-2 The plasma membrane serves many functions, many of which depend on the presence of specialized membrane proteins. Which of the following roles of the plasma membrane could still occur if the bilayer were lacking these proteins? (a) intercellular communication (b) selective permea...

Chemical reactions in living systems occur in an ____________________ environment, within a narrow range of temperatures. (a) optimal (b) organic (c) extracellular (d) aqueous - CORRECT ANSWER-(d) aqueous True or false: The chemistry of life is carried out and coordinated primarily by the action of small molecules. - CORRECT ANSWER-False. Although small molecules are important in many processes, the chemical reactions in living systems are regulated by the coordinated action of large ...

Chemical reactions carried out by living systems depend on the ability of some organisms to capture and use atoms from nonliving sources in the environment. The specific subset of these reactions that break down nutrients in food can be described as _________________. (a) metabolic (b) catabolic (c) anabolic (d) biosynthetic - CORRECT ANSWER-(b) catabolic When there is an excess of nutrients available in the human body, insulin is released to stimulate the synthesis of glycogen from gl...