Which of the following statements is false about bulk flow?
A) It is driven primarily by pressure potential.
B) It is more effective than diffusion over distances greater than 100 ?m.
C) It depends on a difference in pressure potential at the source and sink.
D) It depends on the force of gravity on a column of water.
E) It may be the result of either positive or negative pressure potential.
Ans: D) It depends on the force of gravity on a column of water.
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In attenuation regulation of the trp operon, which stem loop forms when tryptophan is readily available to the cell?
A. 1:3 B. 2:3 C. 3:4 D. 2:4
The type of filter used in a laminar flow biological safety cabinet is called a(n) ________ filter.
What will be an ideal response?
The three Domains in which all living things are classified are
A. Animals, Plants, and Microbes. B. Noneukaryotic, Eukaryotic, and Archaea. C. Eubacteria, Archaea, and Eukarya. D. Bacteria, Plants, and Animals.
In their 1953 paper on the double-helical structure of DNA, Watson and Crick famously wrote: "It has not escaped our notice that the specific pairing we have postulated immediately suggests a possible copying mechanism for the genetic material." What did they mean?
A. Sexually reproducing organisms swap their DNA. B. The sugar-phosphate backbone of DNA holds the helix together in a way that allows the genetic information to be copied. C. Each strand in a DNA double helix contains all the information needed to produce a complementary partner strand. D. When a cell divides, each DNA helix is split between the daughter cells.