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BCS103 Mod5
Module 5 Practice Lecture Quiz
| Question | Answer |
|---|---|
| A nucleotide may contain | purine, a sugar, a phosphate group, and a pyrimidine |
| A purine, a nitrogen containing base with a single-ring structure, that pairs with thymine. | Adenine |
| A process that restores the original base sequence when part of a DNA molecule gets altered. | DNA repair |
| The DNA molecule could be compared to a | twisted ladder |
| Who discovered what would eventually be called deoxyribonucleic acid (DNA)? | Miescher |
| A solution that has a lower concentration of solute as compared to the interior of a cell is said to be ____. | hypotonic |
| Four of the five answers listed below are bases used to construct nucleic acids. Select the exception. | phenylalanine |
| All of the following are associated with the process of endocytosis EXCEPT | secretion of cell products |
| _______ can readily diffuse across a lipid bilayer. | oxygen and carbon dioxide |
| Bacteriophages are | viruses |
| In the bonding of nitrogenous bases in DNA | guanine is paired with cytosine |
| Wilting of a plant occurs | when a plant with flexible cell walls is placed in a hypertonic solution |
| Each DNA strand has a backbone that consists of alternating | sugar and phosphate molecules |
| The significance of Fred Griffith's experiment in which he used two strains of Streptococcus pneumoniae is that | it demonstrated that harmless cells had become permanently transformed though a change in the bacterial hereditary system. |
| Four of the five below are correctly paired. Select the exception. | A-C |
| Movement of a molecule against a concentration gradient is | active transport |
| Rosalind Franklin's research contribution was essential in | establishing most of the principal structural features of DNA. |
| The carrier molecules used in active transport are | proteins |
| A single-celled freshwater organism, such as a protistan, is transferred to salt water. Which of the following is likely to happen? | the cell shrinks |
| In the pairing of two nucleotides within the double helix | In the pairing of two nucleotides within the double helix hydrogen bonds are used. adenine and thymine bind together. purines bind with pyrimidines. double-ring nitrogenous bases connect to single-ring bases. |
| Adenine and guanine are | double-ringed purines |
| This is the process whereby a protein assists in simple diffusion. | facilitated diffusion |
| DNA replication requires _____. | free nucleotides new hydrogen bonds enzymes |
| replication of DNA | produces two molecules, each of which is half-new and half-old DNA joined lengthwise to each other. |
| One species' DNA differs from others in its _____. | base sequences |
| This process specifically moves water molecules across a differentially permeable membrane. | osmosis |
| DNA ligase | fills in tiny gaps between short stretches of DNA |
| Which of the following needs a transport protein to cross the cell membrane? | glucose |
| A solution that has the same concentration of solute as the interior of a cell is said to be _____. | isotonic |
| A solution that has a higher concentration of solute as compared to the interior of a cell is said to be ____. | hypertonic |
| This explains the movement of molecules from an area of low concentration to an area of high concentration. | active transport |
| White blood cells use _____ to get rid of foreign particles in the blood. | phagocytosis |
| DNA polymerase | is an enzyme adds new nucleotides to a strand proofreads DNA strands to see that they are correct |
| The appropriate adjective to describe DNA replication is | semiconservative |
| For all cells and many viruses, a nucleic acid that is the molecule of inheritance. | DNA |
| Which is NOT a nucleotide base in DNA? | uracil |
| Which of the following is NOT a form of active transport? | diffusion |
| Potassium ions cross a membrane through transport proteins that receive an energy boost. This is an example of_____. | active transport |
| Which statement is NOT true about Fred Griffith's experiments? | Mice injected with heat-killed S bacteria die. |
| In simple diffusion | the rate of movement of molecules is controlled by temperature and pressure the movement of individual molecules is random the movement of molecules of one substance is independent of the movement of any other substance. the net movement is away from the region of highest concentration |
| Immerse a living cell in a hypertonic solution, and water will tend to _____. | move out of the cell |
| A small organic compound of a five-carbon sugar, nitrogen-containing base, and a phosphate group. | Nucleotide |
| In 1953, who proposed the concept of the double helix as it pertains to a DNA molecule? | Watson and Crick |
| Rosalind Franklin used which technique to determine many of the physical characteristics of DNA? | x-ray diffraction |
| Which statement is true concerning a cell placed in a hypertonic solution? | it will swell |
| This phenomenon explains the movement of any kind of molecule from areas of higher concentration to ones of lower concentration. | simple diffusion |
| The rate of diffusion through a semipermeable membrane will be lowest when which of the following are true? | temperatures are low |
| When DNA replication begins, _____. | the two DNA strands unwind from each other |
| A DNA strand having the sequence C-G-A-T-T-G would be complementary to the sequence ______. | G-C-T-A-A-C |
| Which scientist(s) identified the transforming substance involved in changing R bacteria to S? | Avery & fellow biochemists |
Created by:
pfrizzel