BIOL 180 / BIOL180 QUIZ 3 - QUIZ SUBMISSIONS

Quiz Submissions - Quiz 3 Attempt 1 Written: Dec 27, 2020 8:45 PM - Dec 27, 2020 9:24 PM Submission View Your quiz has been submitted successfully. Question 1 In an electron microscope, what type of cells are used? Question options: live and fresh cells live, processed cells dead, but fresh cells dead, processed cells Hide Feedback Great job. Question 2 If a solution outside of a cell has a lower concentration of solutes inside of a cell, it is referred to as what? Question options: facilitated isotonic hypertonic hypotonic Hide Feedback Osmolarity describes the total amount of solutes dissolved in a specific amount of solution, and can either have more, less or the same amount of solutes. Review passive transport in Chapter 3. Question 3 Cells that communicate with each other by direct contact use what? Question options: central vacuole endoplasmic reticulum intercellular junctions plasma membrane Hide Feedback Great job. Question 4 Light and dissecting microscopes are binocular. What does this mean? Question options: They have one eye piece, and one lens system They have one lens system, that is split for each eye They have two separate lens systems, one for each eye They have two eye pieces, and one lens system Hide Feedback Great job. Question 5 If a substance must move up a concentration gradient, there is an input requirement of what from the cell? Question options: ATP H2O Sugar NaCl Hide Feedback Great job. Question 6 Which structure carries out oxidation reactions that break down fatty acids and amino acids? Question options: mitochondria peroxisomes ribosomes chloroplasts Hide Feedback Great job. Question 7 Why can't cells store extra free energy? Question options: they can store free energy, which is why we are able to survive it would result in a lowering of heat, which would freeze the cells it would result in an increase of heat, which would denature enzymes it would result in a lack of space, which would keep out other molecules Hide Feedback Great job. Question 8 Reactions that absorb free energy are called what? Question options: endergonic exergonic potential kinetic Hide Feedback Great job. Question 9 What kind of metabolic pathway takes small molecules and builds them into larger ones, requiring energy? Question options: metabolism bioenergetics catabolic anabolic Hide Feedback Great job. Question 10 If a molecule binds to an active site in an enzyme, but it is not involved in the reaction and is simply slowing it down, what is it called? Question options: competitive inhibition active site substrate enzyme Hide Feedback Inhibition occurs when a molecule binds to the active site in the enzyme. Review energy and metabolism in Chapter 4. Question 11 What is the term for when an activator binds to an enzyme, which alters the active site so that the substrate is able to bind? Question options: competitive inhibition allosteric activation active site allosteric inhibition Hide Feedback Activation occurs when an enzyme is turned on, and can occur using an alternate site. Review energy and metabolism in Chapter 4. Question 12 What kind of energy does a slow moving wrecking ball contain? Question options: chemical energy kinetic energy heat energy light energy potential energy Hide Feedback Great job. Question 13 During the light-dependent reactions of photosynthesis, what are the two energy-carrier molecules that absorb the energy from sunlight? Question options: ADP and ATP ATP and NADPH ADP and NADPH NADPH and water ATP and water Hide Feedback Great work! Question 14 During the light-dependent reactions of photosynthesis, where does the oxygen come from? Question options: the hydrolysis of water the hydrolysis of glucose the loss of sugar the loss of pigment Hide Feedback Great job! Question 15 What is the cause of the electrochemical gradient in the thylakoid space? Question options: a buildup of hydrogen ions causing a difference in charge across the thylakoid membrane a buildup of glucose causing a difference in the charge across the thylakoid membrane a loss of oxygen through the stomata causing a shortage in the mesophyll cells a loss of carbon dioxide through the stomata causing a shortage in the mesophyll cells Hide Feedback Great job! Question 16 In which plant organ does photosynthesis most commonly occur? Question options: the root the stem the leaf the flower Hide Feedback Great job! Question 17 After a photon strikes photosystem II, photosynthesis is initiated. The energy then travels through the electron transport chain, and pumps what into the thylakoid space? Question options: carbon oxygen hydrogen nitrogen Hide Feedback Great job! Question 18 What is the name of the pigment in plants that absorbs wavelengths from the red and blue portions of the visible spectrum? Question options: chlorophyll a chlorophyll b carotenoids glucose Hide Feedback Great job! Question 19 Why is the mitochondria so important to a eukaryotic cell? Question options: they create energy from basic sugar molecules it is the site of RNA synthesis and DNA storage they are only found in eukaryotes they play a role in protein synthesis they are involved in transport of molecules Hide Feedback Great job! Question 20 What is pili in prokaryotes? Question options: circular pieces of DNA that contain genes but not involved in cell reproduction hair-like structures found on the surface of some prokaryotes area of cytoplasm that contain the DNA molecule made of two lipid layers which make the inside hydrophilic and the outside hydrophobic a long whip-like structure that propels the cell into motion Hide Feedback Great job! Question 21 What is the jelly-like matrix in both prokaryotes and eukaryotes that provides form to the cell and holds many of the organelles? Question options: cytoplasm ribosomes DNA plasma membrane Hide Feedback Great job! Question 22 What is a good generic definition of a hypothesis? Question options: A theory that can easily be proven by conducting a few simple experiments. A combination of politics and scientific research to answer important questions for the general population. An educated guess or expected answer to a scientific question based on prior knowledge and observation. A prediction concerning a natural phenomenon based on personal observations in the natural world. Hide Feedback Correct! Remember, a hypothesis should be based on observation, but should also be objective. Question 23 Charles Darwin's concept of natural selection is said to be what? Question options: Scientific Law Alternative Hypothesis Scientific Theory Null Hypothesis Hide Feedback Correct! Natural selection is a theory, as it explains the why and how behind evolution. Question 24 What is said of the hypothesis if the data gathered in an experiment is what is anticipated? Question options: rejected disproven supported proven Hide Feedback Correct! The scientific method cannot prove or disprove a hypothesis directly. Attempt Score: 63 / 72 - 87.5 % Overall Grade (highest attempt):