Which of the following relationships is accurate?
a. insects: Malpighian tubules: urea as major nitrogenous waste
b. annelids: protonephridia: ammonia as major nitrogenous waste
c. freshwater fish: kidney: large volume of hypertonic urine
d. sharks: kidney: large volume of hypotonic urine
e. earthworm: kidney: ammonia as major nitrogenous waste
d
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How does cAMP affect the expression of the lac operon?
A. cAMP binds to the CRP, decreasing its affinity for a DNA site near the promoter. B. cAMP binds to the CRP, increasing its affinity for a DNA site near the promoter. C. cAMP binds to the Lac repressor, decreasing its affinity for a DNA site near the promoter. D. cAMP binds to the Lac repressor, increasing its affinity for a DNA site near the promoter.
The DNA-protein complex in eukaryotic chromosomes is called the genome
Indicate whether the statement is true or false
In complex land plants, the diploid stage is resistant to adverse environmental conditions, such as dwindling water supplies and cold weather. The diploid stage progresses through which sequence?
a. gametophyte ? male and female gametes b. spores ? sporophyte c. zygote ? sporophyte d. zygote ? gametophyte e. spores ? gametophyte
Which muscle extends the leg at the knee?
a. gluteus maximums b. biceps femoris c. gastrocnemius d. sartorius e. quadriceps femoris