A polypeptide in a wild type microbe contains the sequence Leu-Pro-Tyr-Ser-Pro. A phenotypic variant of the species has the peptide sequence Leu-Pro-Cys-Ser-Pro. This is an example of a(n) ________ mutation
A) nonsense
B) missense
C) silent
D) frameshift
E) inversion
B
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In the experiments conducted by Avery, McCarty, and MacLeod, which one of the following hypothetical results would indicate that protein, not nucleic acid, was Griffith's transforming principle?
A. None of the extracts from heat-killed cells are able to transform nonvirulent bacteria. B. All of the extracts from heat-killed cells are able to transform nonvirulent bacteria. C. Only the extract from heat-killed cells treated with RNase are unable to transform nonvirulent bacteria. D. Only the extracts from heat-killed cells treated with DNAse are unable to transform nonvirulent bacteria. E. Only the extracts from heat-killed cells treated with protease are unable to transform nonvirulent bacteria.
Which of the following statements about collagen is INCORRECT?
A. There can be numerous types of collagen in multicellular organisms B. It is produced from polymers of amino acids. C. It tends to promote the "sticky" characteristics of the ECM. D. Its breakdown is a contributing characteristic of wrinkling during aging. E. It is a major component of the ECM for cartilage and bone.
Investigators have found a new species bacteria that lives under both aerobic and anaerobic conditions. They hypothesize that different genes are expressed in each condition. What experiment could test this hypothesis and identify important genes?
A. Design primers to a specific region of the genome and sequence this region during both anaerobic and aerobic conditions B. Completely sequence the genome of the bacteria in both aerobic and anaerobic conditions C. Collect mRNA from both anaerobic and aerobic conditions and generate two cDNA libraries D. Measure levels of RNA Polymerase in both conditions
In general, communities in early succession will be dominated by fast-growing species with r-selected life histories.
Answer the following statement true (T) or false (F)