Bio 150 Final Exam - UTK Mamantov(2024 Latest Update)Verified.

What statement best distinguishes scientific hypotheses from scientific theories? - ANSWER Hypotheses are usually narrower in scope; theories have broader explanatory power. A controlled experiment ____________. - ANSWER includes at least two groups, one of which does not receive the experimental treatment In trying to determine whether DNA or protein is the genetic material, Hershey and Chase made use of which fact? - ANSWER DNA contains phosphorus, whereas protein does not. In analyzing the number of different bases in a DNA sample, which result would be consistent with the base-pairing rules? - ANSWER A / T = C / G Within a double-stranded DNA molecule, adenine forms hydrogen bonds with thymine and cytosine forms hydrogen bonds with guanine. This arrangement ________. - ANSWER permits complementary base pairing In the process of transcription, ________. - ANSWER RNA is synthesized Once researchers identified DNA as the unit of inheritance, they asked how information was transferred from the DNA in the nucleus to the site of protein synthesis in the cytoplasm. What is the mechanism of information transfer in eukaryotes? - ANSWER Messenger RNA is transcribed from a single gene and transfers information from the DNA in the nucleus to the cytoplasm, where protein synthesis takes place. The "universal" genetic code is now known to have exceptions. Evidence for this can be found if what is TRUE? - ANSWER If UGA, usually a stop codon, is found to code for an amino acid such as tryptophan (usually coded for by UGG only) in a different organism Why did the F1 offspring of Mendel's classic pea cross always look like one of the two parental varieties? - ANSWER One allele was dominant Which of the following best describes Mendel's particulate inheritance hypothesis? - ANSWER Hereditary components are discrete units that do not change from generation to generation. Two plants are crossed, resulting in offspring with a 3:1 ratio for a particular trait. This ratio suggests that ________. - ANSWER the parents were both heterozygous for the particular trait In tigers, a recessive allele causes a white tiger (absence of fur pigmentation). If one phenotypically normal tiger that is heterozygous is mated to another that is phenotypically white, what percentage of their offspring is expected to be white? - ANSWER 50% The cause of genetic drift is sampling error, which occurs ________. - ANSWER when allele frequencies of a chosen subset of a population are different from those in the total