Exam 2 spring 2016 Page 1

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1 xam 2 spring 2016 Page 1 Name: ate: 1 ll of the following are composed of eukaryotic cells XPT animals plants fungi bacteria 2 The function of the cytoplasm is to keep the cell contents wet provide a medium for chemical reactions communicate with the external environment 3 Phospholipids are important in membrane structure because their hydrophilic phosphate heads form a continuous surface on both sides of a membrane the hydrophilic fatty acid tails are exposed to the watery environments on either side of the membrane their hydrophobic phosphate heads align with hydrophobic portions of proteins to keep those proteins in place in the membrane none of the above is true 4 Which statement is false. prokaryotic cells have N prokaryotic cells have ribosomes prokaryotic cells have a nucleus prokarotic cells have a plasma membrane more than one of the above are false 5 The plasma membrane functions to allow a cell to communicate with its environment is semi-permeable contains embedded proteins 6 The cytoskeleton is an internal structure of cells that can change shape is composed of protein fibers acts as an internal communication network in the cell 7 The cell controls the make up of the cytoplasm.

2 xam 2 spring 2016 Page 2 8 The primary component of cytoplasm is sugar protein lipid water 9 n example of active transport is osmosis. 10 Which molecules can diffuse into or out of a cell? Oxygen arbon ioxide Small hydrophobic molecules 11 Insulin diffuses into cells opens channel proteins so glucose can diffuse into cells is an active transport mechanism 12 The picture depicts two solution of glucose ( is 25% glucose, is 55% glucose) with a semi-permeable membrane between them. Which of these is true? Water will flow from to Water will flow from to Glucose will flow from to Glucose will flow from to 13 iffusion of a substance occurs from a concentration to a concentration of the substance. low, high neutral, high high, neutral high, low

3 xam 2 spring 2016 Page 3 14 Your white blood cells engulf bacteria by exocytosis endocytosis filipodia cell junctions 15 ytosol is to pure water. hypertonic hypotonic isotonic 16 ells can communicate with other cells in the body through filipodia cell junctions signalling molecules (hormones) 17 Osmosis is the movement of molecules down a concentration gradient the movement of molecules through a channel protein the movement of large, biologically important molecules across a membrane the movement of water across a membrane the active transport of molecules against a concentration gradient 18 cell is known to respond to a particular hormone. Which of the following must be true of this cell? it is in the heart muscle it responds to both nitric oxide and adrenaline it is also the site of production for this hormone it contains the receptor for the hormone it is an animal cell 19 xocytosis requires energy moves material across the plasma membrane moves material out of the cell 20 hypertonic solution has a lower solute concentration relative to another solution has a higher solute concentration relative to another solution has a solute concentration equal to another solution requires the input of energy

4 xam 2 spring 2016 Page 4 21 Using the picture (figure 1 at the end of the exam), the organelle responsible for synthesizing proteins is 22 Using the picture (figure 1 at the end of the exam), the part labeled "" is composed of amino acids carbohydrates phospholipids nucleic acids fatty acids 23 Using the picture (figure 1 at the end of the exam), N is found in 24 N can pass through a nuclear pore 25 The main function of mitochondria is to produce energy produce N produce proteins produce lysosomes 26 Information passes between the nucleus and the rest of the cell through nuclear pores nuclear envelopes nuclear vesicles

5 xam 2 spring 2016 Page 5 27 In a microscope, you observe an organelle that consists of a series of membrane sheets that appear to be connected to the outer membrane of the nucleus and the plasma membrane. What is the likely identity of this organelle? mitochondrion lysosome Golgi apparatus vacuole endoplasmic reticulum (R) 28 The Golgi apparatus is one destination for substances that have been packaged into transport vesicles by smooth R. 29 The picture shows an animal cell as seen through a compound microscope with a magnification of 400x. The field of view is 400 micrometers across its diameter. The cell you see has a diameter of approximately 10 micrometers 50 micrometers 100 micrometers 500 micrometers 30 One function of rough R is to create new membrane. 31 The organelle responsible for cellular respiration is the chloroplast the lysosome the Golgi apparatus none of the above 32 Which of the following do cells use to move through their environment? flagella ribosomes vesicles more than one of the above are used

6 xam 2 spring 2016 Page 6 33 gene is a segment of N codes for a particular trait is located within a chromosome 34 Looking at a human cell under the microscope, you notice that it has 23 chromosomes. You decide this cell must be from the stomach cancerous a gamete none of the above 35 single cell grows into a multicellular organism by the process of mitosis meiosis fertilization replication 36 ach chromosome contains four sister chromatids a single molecule of N the cell's genotype its own spindle fibers 37 Which answer represents the stages of mitosis in the correct order? prophase - metaphase - anaphase - telophase prophase - anaphase - metaphase - telophase metaphase - prophase - anaphase - telophase prophase - metaphase - telophase - anaphase 38 hromosomes line up during the portion of mitosis. anaphase S phase metaphase telophase 39 ll of the following events occur in telophase XPT N condenses Mitotic spindle disappears Nuclear membrane reforms ll of the above occur. There are no exceptions listed.

7 xam 2 spring 2016 Page 7 40 The cell pictured could be in the following phase G1 prophase telophase anaphase 41 The cell in number 44 is haploid diploid triploid none of the above 42 The cell pictured has how many chromosomes? (enter a number) 43 The genotype of the cell in number 47 is ab a a The cell in number 47 has how many homologous pairs of chromosomes? (enter a number) The cell in number 47 could be in which phase of the cell division cycle? prophase metaphase telophase anaphase

8 xam 2 spring 2016 Page 8 46 You are looking under the microscope at a Paramecium. The organism appears 100x its normal size. The objective you have in place is the objective. scanning low power high power oil immersion 47 Using the diagram of the microscope at the end of this exam, which arrow points to a mechanism that you would use to change the amount of light passing through your specimen? 48 Using the diagram of the microscope at the end of this exam, which arrow points to the coarse adjustment knob? 49 When determining the relative position of 2 threads on a slide, you can tell which one is on top by reversing the order they look to be in. 50 When using a microscope, you should lower the stage when changing to a higher power objective.

9 xam 2 spring 2016 Page 9 nswer Key : xam 2 spring 2016 Question: nswer 4 (+/- 0.0%) 2 (+/- 0.0%)

10 xam 2 spring 2016 Page