Which of the following are lines of evidence that support the theory of evolution by natural selection?
A. The comparison of DNA sequences in different organisms
B. The comparison of body structures in modern organisms
C. The study of the geographic distribution of species on Earth
D. All of the above are lines of evidence that support the theory of evolution
Answer: D
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Answer the question by using the accompanying graph. The optimal pH for enzyme 1 is ____
a. 2 b. 3 c. 4 d. 7 e. 8
Blood samples are taken from the heel of newborn babies to test for a mutation in the PKU gene, which, if left untreated and in severe cases, can lead to mental retardation, reduced skin pigmentation, and seizures. Which concept is being illustrated by
this example? A) incomplete dominance B) polygenic inheritance C) pleiotropy D) codominance
Answer the following questions true (T) or false (F)
1. The purple sulfur bacteria carry out oxygenic photosynthesis. 2. Cocci can be spherical as well as kidney-shaped. 3. Some strains of Staphylococcus aureus can invade the body and cause diseases such as pneumonia and bacteremia.
At several points in the cell cycle there are checkpoints that control the cell's passage from one phase to the next. If a cell receives a signal at each checkpoint, it continues to the next phase; if it does not receive the signal, the cell does not
continue. For example, a growth factor may stimulate a cell to move from G1 into S phase. If no growth factor is present, the cell cycle stops in G1 and the cell does not divide. Predict what would happen to a cell and to a multicellular organism if there was a defect at the checkpoint and the cell continued through the cell cycle even in the absence of a signal. What will be an ideal response?