Which group is characterized by gritty, glassy, protective shells?

A) Water molds
B) Slime molds
C) Dinoflagellates
D) Diatoms
E) Brown algae


D

Biology & Microbiology

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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?

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology

Diffusion will cause a cell's internal environment to become more similar to that of the environment outside the cell

a. true b. false

Biology & Microbiology