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home / study / science / biology / questions and answers / which of the following devices is used for gel ... Question: Which of the following devices is used for Gel Ele... Which of the following devices is used for Gel Electrophoresis? a) a chamber filled with buffer solution b) a gene gun c) a DNA sequencer d) a thermocycler e) a nucleic acid synthesis machine Which of the following is(are) considered to be frameshift mutations? a) insertions b) inversions c) substitution d) both inversion and insertions e) both substitution and insertions Another term for the logarithmic growth of bacterial cells is ? a) generation time. b)exponential growth. c) arithmetic growth. d) absorbance. e) binary fission. If the codon AAA is changed to AAU, it codes for a different amino acid asparagien; this is an example of a? a) silent mutation. b) nonsense mutation. c) frameshift mutation. d) gross mutation. e) missense mutation. Previous The process of introducing animal organs into the human body is? a) recombinant DNA technology. b) biotechnology. c) electrophoresis. d) protoplast fusion. e) xenotransplantation. Previous Which of the following type of mutation is caused by ultra violet radiations? a) duplication b) deletion c) thymine dimer d) base substitution e) single strand break A specimen of urine is determined to contain 30 bacterial cells per microliter. How many cells would be present in a milliliter? a) 300 b) 30,000 c) 3,000 d) 30 million e) 3 Which of the following is a DNA repair enzyme activated by visible light? a) transposase b) DNA photolyase c) bacteriocin d) DNA ligase e) primase Transgenic organisms ? a) contain cells from other organisms. b) contain genetically engineered microbes. c) are the same thing as clones. d) contain genes from other organisms. e) have genomes that have been sequenced completely. Antimicrobial drugs kill bacteria most effectively during which growth phase? a) lag phase b) log phase c) stationary phase d) death phase e) the susceptibility is the same for all phases In vitro means? a) "within glassware." b) "in life." c) "in the cell." d) "within an organism." e) "from a stranger."

Explanation / Answer

Answer

1. c. A DNA sequencer

2. e. Both substitution and insertion

A frameshift mutation (also called a framing error or a reading frame shift) is a genetic mutation caused by indels (insertions or deletions) of a number of nucleotides in a DNA sequence that is not divisible by three.

3. b. Exponential growth

4. b. Nonsense mutation

5. e. Xenotransplantation

6.

7. b. 30,000

8. b. DNA photolyase

9. d. Contain genes from other organisms

10. b. Log phase

11. a within glassware

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