To have a hormone receptor system that is responsive to changes in hormone concentration, it is useful if the concentration of the hormone is
A) always more than 10 times the Kd.
B) never more than 10 times the Kd.
C) far below the Kd before the stimulation of hormone secretion.
D) far above the Kd before the stimulation of hormone secretion.
E) always constant.
C) far below the Kd before the stimulation of hormone secretion.
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Most radiolaria have an internal skeleton made of
A. glycoproteins. B. cellulose. C. siliceous material. D. microtubules.
In arthropods, locomotion is accomplished by muscles that work against
A. each other. B. the exoskeleton. C. a hydrostatic skeleton. D. mineralized bones. E. the pseudocoel.
Identify the correct steps and the correct order for cloning a gene of interest
1. Transform the bacteria. 2. Mix the postrestriction endonuclease gene of interest with the postrestriction endonuclease cloning plasmid. 3. Incubate the combined DNA fragments with the liagase enzyme. 4. Use restriction endonucleases to cut the gene of interest and the target DNA. 5. Spread bacteria on medium containing lactose and ampicillin. 6. Spread bacteria on medium containing X-gal and ampicillin.
a. 4, 2, 3, 1, 6 b. 4, 3, 2, 1, 5 c. 4, 3, 2, 1, 6 d. 4, 2, 3, 1, 5 e. 2, 4, 1, 5, 3
Which of the following is NOT a characteristic
of a stolon?
a. they are found on strawberries b. they have nodes c. they originate from roots d. they grow above or below ground e. more than one of these is NOT a characteristic of a stolon