PCB3023 Exam 1, cell bio test 1 FAU Theisen, CH.1 Cells and Genome questions with answers

PCB3023 Exam 1, cell bio test 1 FAU |\ |\ |\ |\ |\ |\ |\ |\




Theisen, CH.1: Cells and Genome |\ |\ |\ |\ |\




questions with answers |\ |\




proteins are able to bind to which of the following types of
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biological molecules - CORRECT ANSWERS ✔✔- amino acids,
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sugars, nucleotides, lipids, are basis for most reactions in cells.
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All proteins are able to bind to one or more molecules, often
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other proteins and bound substances such as ligands or
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substrates.


in cells the strongest chemical interaction is? - CORRECT
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ANSWERS ✔✔- covalent bonds ; covalent bonds are strong,
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stable, long-lasting. |\




hydrogen bonds are... - CORRECT ANSWERS ✔✔polar covalent,
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individually weak, but many bonds together can be strong.
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ionic bonds are... - CORRECT ANSWERS ✔✔strong and pliable but
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can easily be disrupted by polar solvents (eg. water)
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van der waals forces are... - CORRECT ANSWERS ✔✔individually
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very weak |\




the majority of biological catalyst are made from... - CORRECT
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ANSWERS ✔✔- amino acids |\ |\ |\

,In the A, B, C class of protein transport pump. The conformation
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changes that lead to translocation of the transporter substance
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are caused by... - CORRECT ANSWERS ✔✔- repeated cycles of ATP
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binding and hydrolysis
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True regarding prokaryotic cells? - CORRECT ANSWERS ✔✔- has a
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cell wall
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- reproduce by binary fission
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- do not exist as true...
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- utilize double strands for hereditary material
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- do NOT package their DNA so they do NOT need histones
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Evolution of the nucleus in eukaryotic organisms has allowed... -
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CORRECT ANSWERS ✔✔- Segregation of DNA from other cellular |\ |\ |\ |\ |\ |\ |\ |\ |\


processes
- Increase the size of the DNA molecule
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When a carbohydrate is oxidized it loses both ____ and ____. -
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CORRECT ANSWERS ✔✔- electrons and energy ; Oxidation is the |\ |\ |\ |\ |\ |\ |\ |\ |\ |\


loss of electrons and energy. The atom is left with a more
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POSITIVE charge. |\




what is meant by high specificity between molecules? - CORRECT
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ANSWERS ✔✔- highly complementary physical shape
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- highly complementary electro chemical properties
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,The histones used to package newly replicated DNA - CORRECT
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ANSWERS ✔✔- added to DNA as it is emerging from the |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\


replication machinery |\




mutations within DNA coding regions... - CORRECT ANSWERS ✔✔-
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usually results to deleterious changes in protein structure
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DNA coding regions have important information, any mutations
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on these regions are most of the time negative (bad), so it will
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not be beneficial.
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Entropy is the measure of... - CORRECT ANSWERS ✔✔- the
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amount of disorder in a system |\ |\ |\ |\ |\




a protein secondary structure is maintained by - CORRECT
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ANSWERS ✔✔- hydrogen bonds |\ |\ |\




hydrogen bonds are the bonds between atoms |\ |\ |\ |\ |\ |\




binding of a ligand to a specific enzyme binding site... - CORRECT
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ANSWERS ✔✔- involves numerous weak noncovalent bonds
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it is not a permanent binding, so it CANNOT be covalent, it has to
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be a weak bond in order for it to be able to break or go back to
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its original form.
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, Chemical analysis of DNA will reveal the following... - CORRECT
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ANSWERS ✔✔- Concentration of Purines equals concentration of
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Pyrimidines


Because its circular, replication of prokaryotic DNA does NOT
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require... - CORRECT ANSWERS ✔✔- Telomerase function
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Telomerase is used to stabilize the ends of Eukaryotic |\ |\ |\ |\ |\ |\ |\ |\ |\


chromosomes which are linear. Since prokaryotic DNA is not |\ |\ |\ |\ |\ |\ |\ |\ |\


linear, it does NOT need telomerase to stabilize its ends.
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Flipping out refers to... - CORRECT ANSWERS ✔✔- The temporary
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separation of a base from its compliment to allow close |\ |\ |\ |\ |\ |\ |\ |\ |\ |\


inspection.


activation energy is a property of... - CORRECT ANSWERS ✔✔- all
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types of chemical reactions
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It is NOT the energy required to push a reaction in an
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unfavorable direction. |\




Universal features of all cells... - CORRECT ANSWERS ✔✔- take up
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matter from their surroundings
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- store hereditary information
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- use RNA to direct protein synthesis
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- all cells use DNA
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- all cells replicate their DNA
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