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
E. Autocrine
If a cell responds to the ligand that it secretes, this is considered autocrine signaling.
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Which type of regulator(s) specifically bind to operator regions of DNA?
A) activators B) activators and inducers C) repressors D) repressors and corepressors
Capillary action is one of the forces that aids water's upward movement in plants. The narrower the diameter of the tube, the farther the water column will rise. Capillary action is a result of water molecules:
A. producing sufficient surface tension to overcome the pull of gravity. B. having a strong cohesive force and attaching to the surrounding vessel walls. C. storing heat and thus moving faster because of heat of vaporization. D. having an adhesive force, which allows them to attach to the vessel walls. E. being associated with hydrophobic molecules, which can result in upward movement.
Describe the Lyon hypothesis What will be an ideal response?
What group of microbes is known to grow at more acidic pH's
What will be an ideal response?