Midterm 2 SAMPLE TEST Name MULTIPLE CHOICE Choose the one alternative that best completes the statement or answers the question 1 Substrate level phosphorylation occurs within a metabolic pathway where suf cient energy is 1 released by a given chemical reaction to drive the synthesis of ATP from ADP and phosphate In which of the following metabolic pathways is substrate level phosphorylation exhibited A during oxidative phosphorylation C in both glycolysis and the Krebs cycle B in glycolysis D in the Krebs cycle 2 Based on what you know about the structure and function of the antenna complex irradiating a leaf with which of the following light types would result in the release of the greatest quantities of oxygen 2 A red and blue light C violet and red light B green and blue light D red and orange light 3 Flagella are found in both eukaryotic cells and prokaryotic cells Despite the functional 3 similarities of all agella scientists suspect that eukaryotic and prokaryotic agella have evolved independently Why don t they think there is a common evolutionary origin for prokaryotic and eukaryotic agella A Prokaryotic agella do not protrude outside the cell wall whereas eukaryotic agella are membrane bound extensions of cytoplasm B Prokaryotic agella are an adaptation to scarce nutrient supplies whereas eukaryotic agella are designed to protect C Eukaryotic agella undergo an undulating motion and are covered by a plasma membrane prokaryotic agella move by rotating and lack a plasma membrane D Prokaryotic agella do not require energy in the form of ATP as eukaryotic agella do 4 Nerve cells lose their ability to undergo mitosis Instead they are permanently stuck in 4 A G0 C G2 A cyclins C p53 B S of interphase D metaphase B PDGF D activated MPF 5 For cells to divide more rapidly increased production would likely be required of each of the 5 following proteins except 6 You place yeast cells in a glucose solution and plot the rate of glucose uptake You see an 6 increase in glucose uptake over time that is the longer the yeast are in the sugar solution the faster they can take sugar into the cell The most likely explanation for this is the cell membrane is becoming more permeable because A the yeast is inserting more cholesterol into the membrane B the difference in glucose concentration between the inside of the cell and outside of the cell is decreasing cell is increasing C the difference in glucose concentration between the inside of the cell and outside of the D the yeast is inserting more glucose protein transporters into its membrane 1 7 What is the main purpose of the light dependent reactions of photosynthesis 7 A to produce NADPH for use in respiration B to produce NADPH and ATP C to use ATP to make glucose D to generate oxygen by splitting H2O 8 The proteins of the electron transport chain active in the light dependent reactions 8 A are considered to be part of the reaction center of photosystem I B are free proteins present in the thylakoid lumen C are membrane proteins present in the thylakoid D absorb the same wavelengths of light as their associated chlorophylls 9 Integral membrane proteins stay in membranes because of 9 A osmotic pressure from proteins outside the cell B the locations of their polar and nonpolar amino acids C diffusion of proteins from the cytoplasm to the membrane D their small size which does not allow them to pass through the membrane 10 Oxidative phosphorylation the electron transport chain is carried out during 10 A glycolysis C alcoholic fermentation B aerobic respiration D lactate fermentation 11 Purple photosynthetic bacteria do not contain chloroplasts They have an antenna system that 11 includes two light harvesting protein complexes both of which are integral membrane proteins The bacteriochlorophyll a molecules contain Mg2 and absorb light at 800 nm Which of the following statements comparing photosynthesis in purple bacteria and plant chloroplasts is true A Because purple bacteria do not have chloroplasts there is no electron transport associated with photosynthesis B Bacteriochlorophyll a absorbs light most ef ciently in the ultraviolet range at a signi cantly shorter wavelength than that for chlorophyll a of chloroplasts C Bacteriochlorophyll a is a molecule containing Mg2 whereas chlorophyll a from chloroplasts contains Fe2 D Plant chlorophyll a absorbs in the visible light range whereas purple photosynthetic bacteriochlorophyll a absorbs light at a longer wavelength 12 Steroid hormones bind to receptors inside the cell and alter their conformation The 12 hormone receptor complex is then transported into the nucleus where it can directly affect gene expression To get from the location where the receptor binds the hormone to its site of action the hormone receptor complex must A enter the smooth endoplasmic reticulum B be transported through the nuclear pore complex C become water soluble by binding to a carrier molecule D undergo another conformational change 2 13 Some cells have several nuclei per cell How could such multinucleated cells be explained 13 A The cell underwent repeated cytokinesis but no mitosis B The cell underwent repeated mitosis with simultaneous cytokinesis C The cell had multiple S phases before it entered mitosis D The cell underwent repeated mitosis but cytokinesis did not occur 14 Scientists isolate cells in various phases of the cell cycle They nd a group of cells that have 1 14 times more DNA than do G1 phase cells The cells of this group are A in the M phase of the cell cycle B in the G2 phase of the cell cycle C between the G1 and S phases in the cell cycle D in the S phase of the cell cycle nucleus A It lacks a nuclear localization signal NLS B It contains errors in its amino acid sequence C It lacks a signal sequence D It is too large 15 What can you infer about a high molecular weight protein that cannot be transported into the 15 16 The text states that ribonucleotides can diffuse through some types of liposomes It s likely that the lipids present early in chemical evolution had short chains Would liposomes formed from these types of lipids be more or less permeable to ribonucleotides than if early cells formed from long chained lipids 16 A same permeability B more permeable C less permeable 17 A gap junction is a channel that connects adjacent cells From substances listed which one 17 cannot pass through a gap junction A amino acids C ions that can regulate heartbeat B nucleotides D ribosomes 18 The enzyme