Scaphopods use tentacles on their heads for capturing their prey
Indicate whether the statement is true or false
T
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When the pituitary gland releases thyroid-stimulating hormone (TSH), the hormone circulates throughout the entire bloodstream, yet only the cells of the thyroid gland respond. This specificity is due to the presence of _____ in the cell membranes of the thyroid
1.adhesion proteins 2.receptor proteins 3.recognition proteins 4.transport proteins
Which sort of interaction is harmful to one species but beneficial to the other? What will be an ideal response?
The prolonged low temperature exposure required for the germination of some seeds:a
is typical of coconuts. b. provides an alternative to the process of imbibition. c. prevents them from growing in flooded, anaerobic soils. d. allows the seeds to conserve limited food stores. e. ensures that the seeds germinate in spring, rather than in winter
Which of the following describes the Lac operon in E. coli when lactose, but not glucose, is present in the culture medium?
A. CAP and the Lac repressor are both bound to the Lac operon's regulatory DNA, and the Lac operon is not expressed. B. Neither CAP nor the Lac repressor is bound to the Lac operon's regulatory DNA, and the Lac operon is expressed. C. Neither CAP nor the Lac repressor is bound to the Lac operon's regulatory DNA, and the Lac operon is not expressed. D. CAP, but not the Lac repressor, is bound to the Lac operon's regulatory DNA, and the Lac operon is expressed. E. The Lac repressor, but not CAP, is bound to the Lac operon's regulatory DNA, and the Lac operon is not expressed.