What conditions are responsible for the stimulation of the JGA (juxtaglomerular apparatus)?
a. an increase in blood pressure or blood volume within the heart
b. an increase in the solute concentration of the blood plasma
c. a decrease in the solute concentration of the blood plasma
d. a decrease in the blood pressure or blood volume in the afferent arteriole
e. consumption of alcohol
Answer: d. a decrease in the blood pressure or blood volume in the afferent arteriole
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You are a botanist who is immersed in your attempt to increase a certain property in your plant of study. To that end, you induce a mutation that doubles the amount of vascular cambium (a type of meristem) in your plant. Assuming this brings the desired effect, what exactly was the property that you sought to increase?
A. Production of new growth at the tip of stems. B. Production of secondary xylem and phloem. C. Production of only xylem to make wood. D. Production of bark only. E. Production of new leaves.
________ membranes allow some molecules to pass but not others.
A. Selectively permeable B. Inverted monolayer C. Impermeable D. Permeable
What would occur if the repressor of an inducible operon were mutated so that it could not bind the operator?
A) irreversible binding of the repressor to the promoter B) reduced transcription of the operon's genes C) continuous transcription of the operon's genes D) overproduction of catabolite activator protein (CAP)
For some single-celled organisms reproduction only occurs asexually. What benefit does an organism gain by only using this method of reproduction?
A) It allows for varied genetic information. B) It is a quick way to produce two identical daughter cells. C) The offspring created have double the genetic information as the parent cell. D) It allows for daughter cells that are not genetically identical because of crossing over.