Answer the following statements true (T) or false (F)
1. A single pre-mRNA can be alternatively spliced into more than one type of mRNA.
2. If an acetyl group is added post-translationally to a protein, it can be subsequently removed.
3. A simple dot matrix is an efficient method to identify homologous regions of long DNA sequences.
4. DNA sequences from several different vertebrates are translated and found to contain a gene. Comparison of the sequences shows that they are 95% identical to each other. Therefore, it can be concluded that the genes are homologs.
5. Sequences that are alike will produce a horizontal line in a dot matrix analysis.
1. TRUE
2. TRUE
3. FALSE
4. TRUE
5. FALSE
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When killifish were present, what was the main selection factor affecting the average number of spots on male guppies?
a. reduction in spot number to avoid predation b. increase in spot number to attract females c. both selective forces were in effect when killifish were present
In rabbits, there are four alleles at the c locus
Arranged in dominance sequence they are:C (agouti), cch(chinchilla), ch(Himalayan), and c (albino) (a) Is it possible to cross two agouti rabbits and produce both chinchilla and Himalayan offspring? (b) Is it possible to cross two chinchillas and produce 1/2 chinchilla and 1/2 Himalayan? What will be an ideal response?
Absorbance at Various pH Levels
Time (sec) pH 4 pH 5 pH 6 pH 7 pH 8 pH 9 20 0.003 0.025 0.055 0.146 0.005 0.004 40 0.009 0.109 0.152 0.300 0.015 0.008 60 0.012 0.195 0.255 0.432 0.038 0.010 80 0.020 0.215 0.341 0.552 0.065 0.012 100 0.023 0.333 0.413 0.659 0.081 0.013 120 0.025 0.360 0.478 0.755 0.090 0.013 The accompanying table represents the results of an experiment where the effects of pH buffers on an enzyme found in saliva (amylase) were studied. A spectrophotometer set at 500nm was used to measure absorbance at the various pH levels every 20 sec for 2 min. The higher absorbance values would indicate greater enzyme activity. All experiments were conducted at the same temperature. Which statement correctly identifies the result that the optimum pH for amylase function is 7? A) The pH with the lowest absorbance values would indicate the optimum pH for amylase since this pH does not affect the structure or function of the protein. B) The pH with the highest absorbance values would indicate the optimum pH for amylase since this pH does not affect the structure or function of the protein. C) At pH 9, the enzyme is denatured and will lose its function, but not its structure. D) At pH 4, the structure of the enzyme will be altered, and the enzyme would not be able to catalyze the reaction.
In a nucleotide, the nitrogenous base is attached to the sugar's _____ carbon and the phosphate group is attached to the sugar's _____ carbon
Fill in the blank(s) with the appropriate word(s).