Nod genes, which NodD activates, code for nodulation proteins, most of which are involved in the biosynthesis of Nod factors such as;

 a) Nod factors are lipochitin oligosaccharide signal molecules

 b) Nod factor shave a chitin β-1→ 4-linked N-acetyl-D-glucosamine backbone

 c) These N-acetyl-D-glucosamine backbone varying in length from three to six sugar units

 d) A fatty acid chain on the C-2 position of the nonreducing sugar determine the length and degree of saturation of the fatty acyl chain by NodL

 Which of the following is incorrect?

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#Question id: 15305

#Unit 4. Cell Communication and Cell Signaling

The multi-hit model, which proposes that multiple mutations are needed to cause cancer, which of the following is incorrect regarding to this model?

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#Question id: 3431

#Unit 11. Evolution and Behavior

In the territorial behavior of the stickleback fish, the red belly of one male elicits attack from another male by functioning as

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#Question id: 379

#Unit 1. Molecules and their Interaction Relevant to Biology

A compound has a pKa of 7.4. To 100 mL of a 1.0 M solution of this compound at pH 8.0 is added 30 mL of 1.0 M hydrochloric acid. The resulting solution is pH:

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#Question id: 14088

#Unit 1. Molecules and their Interaction Relevant to Biology

Type II topoisomerases change the linking number in 

A. Steps of two

B. Steps of three

C. Make transient double-strand breaks 

D. Make transient single-strand break

Mark the option with correct combination

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#Question id: 11141

#Unit 7. System Physiology – Animal

The operation of the sodium-potassium pump moves ________.