Identify several ways in which the study of hemoglobin variants led to an understanding of the molecular relationship among genes, proteins, and human disease
What will be an ideal response?
The discovery of variations in the amino acid composition of hemoglobin was the first example of inherited variations in protein structure. The altered hemoglobin in sickle cell anemia provided the first direct proof that mutations result in a change in the amino acid sequence of proteins. Also, the mutation in sickle cell anemia provided evidence that a change in a single nucleotide is sufficient to cause a genetic disorder. The molecular organization of the globin gene clusters has helped scientists understand how genes evolve and how gene expression is regulated.
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Which of these would be an effective method of controlling yeast populations in a test sample?
a. constant stirring to break up biofilms b. percolating oxygen through the sample c. adding enzymes to inhibit mating factor d. adding antibiotics to the test sample
If sulfur has an atomic number of 16, how many covalent bonds can it form with other atoms?
A) Eight B) Zero C) Two D) Four E) Six
Choose the letter of the best match from the following:A. hypocotylB. endospermC. scutellumD. radicleE. epicotylThe part of the stem axis that extends above the cotyledons in some seedlings.
Fill in the blank(s) with the appropriate word(s).
The relationship among a gene, a messenger RNA, and a protein is that ________
A) genes make mRNA, which then make proteins B) genes make proteins, which then make mRNA C) mRNAs make proteins, which then make genes D) proteins make mRNA, which then make genes E) mRNAs make genes, which then make proteins