What are the functions of helicases and SSB proteins?
What will be an ideal response?
Ans: Helicases separate duplex DNA into single strands using energy provided by the hydrolysis of ATP. In DNA replication, a helicase proceeds at a replication fork to expose template strands for DNA synthesis. Single-strand binding (SSB) proteins bind to the denatured DNA strands and prevent them from reforming the duplex before DNA synthesis occurs.
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The protein Sonic Hedgehog (SHH) plays a role in specifying the identity of digits (such as fingers and toes) in mammals. Several digits arise directly from cells that both express and respond to secreted SHH. What type of signaling would this be considered?
A. Direct contact B. Paracrine C. Endocrine D. Synaptic E. Autocrine
Protein kinases place _____ groups on proteins
1.sulfate 2.hydroxyl 3.phosphate 4.carboxyl 5.carbonyl
The sodium-potassium pump is an example of
a. simple diffusion. b. facilitated diffusion. c. osmosis. d. active transport. e. bulk flow.
An endemic disease
a. is constantly present in the populace. b. has a low incidence in the population. c. is persistent in the population because of the presence of reservoirs. d. is described by all of the above.