BIO 13 Practice Test 40 Questions with Verified Answers,100% CORRECT, Exams of Nursing

Download BIO 13 Practice Test 40 Questions with Verified Answers,100% CORRECT and more Exams Nursing in PDF only on Docsity! BIO 13 Practice Test 40 Questions with Verified Answers RNA contains the sugar a. ribose. b. deoxyribose. c. glucose. d. lactose. - CORRECT ANSWER a. ribose. Unlike DNA, RNA contains a. adenine. b. uracil. c. phosphate groups. d. thymine. - CORRECT ANSWER b. uracil. Which of the following are found in both DNA and RNA? a. ribose, phosphate groups, and adenine b. deoxyribose, phosphate groups, and guanine c. phosphate groups, guanine, and cytosine d. phosphate groups, guanine, and thymine - CORRECT ANSWER c. phosphate groups, guanine, and cytosine Which of the following is true? a. RNA is usually single-stranded. b. DNA is usually single-stranded. c. DNA contains uracil. d. RNA contains thymine. - CORRECT ANSWER a. RNA is usually single-stranded. Which type of RNA brings the information in the genetic code from the nucleus to other parts of the cell? a. rRNA b. tRNA c. mRNA d. RNA polymerase - CORRECT ANSWER c. mRNA Which of the following is true of transcription? a. In eukaryotes, transcription takes place in the cytoplasm and requires many enzymes, b. RNA polymerase recognizes and binds to specific regions of the DNA called introns c. RNA editing removes the exons from pre-mRNA, leaving only the introns in the final molecule. d. RNA polymerase can make many molecules of RNA from a single DNA sequence. - CORRECT ANSWER d. RNA polymerase can make many molecules of RNA from a single DNA sequence. Which of the following statements is true of eukaryotic DNA? a. A promoter is part of an intron. b. An intron is part of a promoter. c. Introns are sequences of DNA. d. Exons are edited out of pre-mRNA - CORRECT ANSWER c. Introns are sequences of DNA. Which molecules are involved in protein synthesis? a. transfer RNA, introns, and mutagens b. messenger RNA, introns, and ribosomal RNA c. ribosomal RNA, transfer RNA, and mutagens d. messenger RNA, ribosomal RNA, and transfer RNA - CORRECT ANSWER d. messenger RNA, ribosomal RNA, and transfer RNA From which molecules are rnRNA molecules transcribed? a. tRNA b. rRNA c. DNA d. proteins - CORRECT ANSWER c. DNA What is produced during transcription? a. RNA molecules b. DNA molecules c. RNA polymerase d. proteins - CORRECT ANSWER a. RNA molecules a. A cell reads the instructions in DNA and builds a protein based on those instructions. b. A gene is copied many times so that all of a cell's daughter cells will have their own copy. c. The nucleus of a cell builds cellular proteins based on the sequence of the mRNA code. d. A single gene leaves the nucleus of a cell and travels through the cytoplasm to the membrane. - CORRECT ANSWER a. A cell reads the instructions in DNA and builds a protein based on those instructions. In eukaryotes a. Transcription takes place in the cytoplasm, and translation takes place in the nucleus. b. Transcription takes place in the nucleus, and translation takes place in the cytoplasm. c. Transcription and translation both take place in the nucleus. d. Transcription and translation both take place in the cytoplasm. - CORRECT ANSWER b. Transcription takes place in the nucleus, and translation takes place in the cytoplasm. A mutation that involves one or a few nucleotides is called a. a mutagen. h. an inversion. c. a point mutation. d. a translocation. - CORRECT ANSWER c. a point mutation. Which of the following is a chromosomal mutation? a. inversion b. insertion c. point mutation d. substitution - CORRECT ANSWER a. inversion One difference between a gene mutation and a chromosornal mutation is that a. A gene mutation affects the DNA of more genes than a chromosomal mutation. b. A gene mutation can involve a insertion or deletion, but cannot result in a frameshift. c. A chromosomal mutation can change the number of chromosomes in a cell. d. A chromosomal mutation is more likely to be passed on to offspring or daughter cells. - CORRECT ANSWER c. A chromosomal mutation can change the number of chromosomes in a cell. When a chromosome undergoes a deletion mutation, information is a. repeated. b. lost. c. reversed. d. transferred - CORRECT ANSWER b. lost. Most mutations a. have no effect on an organism. b. are fatal to an organism. e. are helpful to an organism. d. are harmful to an organism. - CORRECT ANSWER a. have no effect on an organism. What are some characteristics of polyploidy plants? a. They tend to be weaker and smaller than diploid plants. b. They tend to be bigger and stronger than diploid plants. c. They tend to be weaker, but bigger than diploid plants. d. They tend to be smaller, but stronger than diploid plants. - CORRECT ANSWER b. They tend to be bigger and stronger than diploid plants. Which of the following statements is true about gene regulation in prokaryotes? a. Promoters determine whether a gene is expressed. b. Expressed genes make more DNA. c. DNA-binding proteins determine whether a gene is expressed. d. RNA polymerase regulates gene expression. - CORRECT ANSWER c. DNA- binding proteins determine whether a gene is expressed. In E, coli, the lac operon controls the a. breakdown of lactose. b. production of lactose. c. breakdown of glucose. d. production of glucose - CORRECT ANSWER a. breakdown of lactose. A lac repressor turns OFF the expression of the lac genes by a. binding to the promoter. b. DNA polymerase. c. binding to the operator. d. binding to the lac genes. - CORRECT ANSWER c. binding to the operator. When E. coli is grown on glucose, and there is no lactose available a. lactose molecules bind to the lac repressor. b. the lac repressor binds to the operator of the lac operon. c. RNA polymerase binds to the promoter of the lac operon. d. the lac genes are transcribed into messenger RNA. - CORRECT ANSWER b. the lac repressor binds to the operator of the lac operon. Which is involved with the regulation of eukaryotic genes? a. operon b. DNA polymerase c. TATA box d. operator - CORRECT ANSWER c. TATA box Which of the following is involved in regulating gene expression in prokaryotes, but not in eukaryotes? a. operon b. TATA box c. promoter sequences d. enhancer sequences - CORRECT ANSWER a. operon Gene regulation in eukaryotes a. usually involves operons. b. is simpler than in prokaryotes. c. allows for cell specialization. d. includes the action of an operator region - CORRECT ANSWER c. allows for cell specialization. Specialized cells regulate the expression of genes because they a. do not want the genes to become worn out. b. cannot control the translation of proteins.