Which of the following statements about the transfer of fluid from the glomerulus to Bowman's capsule is CORRECT?
A. It results from active transport.
B. It transfers large molecules (e.g., proteins) as easily as small ones.
C. It is very selective as to which small molecules are transferred.
D. It is mainly a consequence of blood pressure force-filtering the fluid.
E. It usually includes the transfer of red blood cells to the nephron tubule.
D. It is mainly a consequence of blood pressure force-filtering the fluid.
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As a result of the action illustrated in the figure,
a. structural genes are transcribed. b. lactose is broken down. c. the lactose operon is repressed. d. the regulatory gene is inactivated. e. lactose production is enhanced.
Certain loci that are in linkage disequilibrium with alleles of interest can be used as markers, which can then be useful in reconstructing the history of those alleles in populations
One such marker/allele is described in your text, where the allele in question has an insertion mutation, rendering an enzyme (glucocerebrosidase, or GBA) nonfunctional. The decay curve for linkage disequilibrium between this marker (named D1S305 ) and the nonfunctional GBA allele is shown in the accompanying figure. The orange lines show the present level of linkage disequilibrium and the inferred number of generations elapsed since the most recent common ancestor. Assuming an average generation time of 25 years, what is the best estimate for how long ago the most recent common ancestor existed? A) about 55 years ago B) about 1375 years ago C) about 2325 years ago D) There is insufficient data to make this determination.
What is considered to be the primary method of succession in the marine intertidal zone?
A. Mutualism B. Facilitation C. Equilibrium D. Tolerance E. Inhibition
In bacteria, fungi, and plants, the high internal pressure generated by osmosis is counteracted by the mechanical strength of their
A. plasma membranes. B. cytoskeletons. C. cell walls. D. organelles.