Termination of the rhodopsin signaling pathway leads to the concentration of cytoplasmic cGMP must be restored to its dark level by the enzyme known as:

#Question id: 1461

#Unit 4. Cell Communication and Cell Signaling

Which of the following correctly describes a Philadelphia chromosome?

#Question id: 28774

#Unit 2. Cellular Organization

Mutation in a structural gene that codes for the lysosomal hydrolase that causes disease, which is?

#Question id: 2533

#Unit 2. Cellular Organization

Cellulose microfibrils have an ordered structure and are synthesized at the plasma membrane, given characteristics of microfibrils;

a) Each microfibril is composed of an estimated 18 parallel chains of (1,4)-linked β-D-glucose chains tightly bonded to each other to form a crystalline microfibril

b) Microfibrils have hydrophilic surfaces, populated by polar –OH groups extending from theplane of the sugar rings

c) Microfibrils have hydrophobic surfaces, populated by nonpolar C–H groups populating thesides of stacked glucose chains

 d) microfibril important for enzymatic attack by microbial cellulases, which dock onto the hydrophobic surface and remove one glucan chain at a time

Which of the following from given characterstics of microfibrils is incorrect?

#Question id: 7297

#Unit 5. Developmental Biology

How is the ABC model for floral identity in Arabidopsis similar to the models for homeotic gene function derived from studies in Drosophila?

#Question id: 26974

#Unit 10. Ecological Principles

Trade off is caused by