Describe the basic structure of normal adult hemoglobin and the abnormality observed in sickle-cell hemoglobin
What will be an ideal response?
The predominant form of adult hemoglobin is composed of two ? and two ? chains. In sickle-cell hemoglobin, the sixth amino acid in the ? chain is valine instead of glutamic acid.
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Which of the following is not an emerging virus?
A. HIV B. SARS C. influenza D. Epstein Barr E. All of these choices are emerging viruses.
Which of the following chemicals is a signal that induces systemic acquired resistance?
A. salicylic acid B. brassinosteroids C. systemin D. avr E. nitric acid
Which statement is true of polytomy branches?
a. Organisms in each branch share a common ancestor. b. Polytomy represent mass speciation from a single mutation event. c. The longest branch is the ancestor of the other sister taxa. d. Polytomy branching only occurs in single-celled organisms.
The primary structure of a protein is determined by ________
A) pleated sheets B) covalent bonds formed between fibroin residues C) the sequence of amino acids D) a series of helical domains E) hydrogen bonds formed between the components of the peptide linkage