Biology Test exam with 100% correct answers 2024

C.14 - Alvin is studying a model of the chemical structure of a common nucleic acid. He observes that the nucleic acid consists of four nitrogenous bases: adenine (A), cytosine (C), guanine (G), and uracil (U). Alvin's observation most strongly supports which of these conclusions? correct answers a. The nucleic acid is a form of RNA, and is not DNA. C.14 - There are three main types of RNA: messenger RNA (mRNA), ribosomal RNA (rRNA), and transfer RNA (tRNA). Which type or types of RNA contain a copy of the instructions that a gene carries? correct answers a. mRNA only C.14 - A molecular biologist is developing a computer model of the transcription of a gene into RNA. Which event should be included in the model before transcription occurs? correct answers c. RNA polymerase binding to a region near the gene, called the promoter. C.14 - Robert is studying a long list of letters. The letters represent the order of nitrogenous bases in a molecule of mRNA. The first several bases in the list are shown below. AUGCCACAGGUUCAUCCGAA... To identify the amino acid sequence encoded by the mRNA, which would be the most useful first step for Robert to follow? correct answers c. Separate the list into three-letter "words." C.14 - A molecule of tRNA includes a sequence of three nitrogenous bases called an anticodon. What is the role of the anticodon in the process of translation? correct answers b. The anticodon binds to a codon on mRNA. C.14 - Translation involves several different types of tRNA molecules. Which statement best describes how tRNA molecules assemble amino acids into a polypeptide? correct answers d. The different tRNA molecules act in a specific order, one after the other like an assembly line. C.14 - The diagram illustrates part of the function of the lac operon. It shows the operator region (O) and a protein that is bound to it. The diagram also shows the enzyme RNA polymerase. What is the function of the protein that is bound to the operator region? SEE CH.14 QUESTION #7 FOR PICTURE! correct answers a. It is a repressor protein that stops transcription from occurring.