Using the genetic code, predict what type of mutation has occurred in the hemoglobin sickle cell anemia allele. Normal allele GGAAUGAAACAGGAACCC Mutant allele GGAAUGAAACAGGUACCC
A. a point mutation, Val to Glu
B. a frame shift
C. addition of a new stop codon
D. a point mutation, Glu to Val
Answer: D. a point mutation, Glu to Val
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A researcher in a lab finds a microscopic organism that is a producer. Populations of this organism are found in
extreme environments (e.g., hot springs). The researcher will correctly identify this organism as belonging to the domain ____.
a. Amoeba b. Eukarya c. Archaea d. Bacteria e. Animalia
Why is it useful to know the structure of a protein when trying to understand a protein's function?
a. Scientists still don't know exactly what features of a protein's structure determine how a protein works. By gathering information about many different protein structures and correlating them to their known functions, we can try to figure out this relationship. b. Since all proteins have enzymatic activity, we hope to learn what features of a protein make an enzyme a catalyst. c. Since x-rays are used on protein crystals to determine the structure, this research can help us understand the ways in which x-rays can be damaging to the proteins of living cells. d. The enzymatic activity of a protein cannot be measured unless we also have the structure of that enzyme. e. We need to know which amino acids are essential for a cell to function. If we know the structure of an enzyme, we can determine which amino acids are present and how they work in the cell.
The pulmonary circuit ____
a. involves the hepatic portal vein b. moves oxygen-rich blood to the kidneys c. includes the coronary arteries d. leads to, through, and from the lungs e. receives blood from the left ventricle
Which of the following traits does the fossil
above share with modern birds? a. long, clawed fingers on each forelimb b. it had teeth c. it had feathers d. it had a long bony tail e. all of these