Which group is characterized by gritty, glassy, protective shells?
A) Water molds
B) Slime molds
C) Dinoflagellates
D) Diatoms
E) Brown algae
D
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Using specific examples, explain why it is sometimes impossible to satisfy Robert Koch's postulates
What will be an ideal response?
Three genes (X, Y, and Z) are in the same region of a bacterial chromosome. To determine the order of these genes, you infect X?Y?Z? cells with a lysate from wild-type cells infected with a generalized transducing phage. When X+ cells are selected, 70% of cells are also Y+ and 5% of cells are Z+. When Y+ cells are selected, 68% of cells are also X+ and 1% are Z+. What is the relative arrangement of the three genes?
A) Z is in the middle, but closer to X. B) Y is in the middle, but closer to Z. C) X is in the middle, but closer to Y. D) X is in the middle, but closer to Z.
A homeobox gene is one that produces a group of repetitive base sequences such as a VNTR
Indicate whether the statement is true or false
Diffusion will cause a cell's internal environment to become more similar to that of the environment outside the cell
a. true b. false