What is the path of urine from formation to excretion in the mammalian kidney?
A. collecting duct ? ureter ? urinary bladder ? renal pelvis ? urethra
B. collecting duct ? renal pelvis ? ureter ? urinary bladder ? urethra
C. ureter ? collecting duct ? renal pelvis ? urinary bladder ? urethra
D. urethra ? collecting duct ? renal pelvis ? ureter ? urinary bladder
E. renal pelvis ? ureter ? urinary bladder ? urethra ? collecting duct
Answer: B
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When researchers calibrate the molecular clock they are
A. determining how much time it takes to accumulate a certain percentage of nucleotide changes. B. setting the geological time scale according to the position in which the fossil was found in the rock. C. investigating where the least common ancestor was found. D. generalizing about the amount of time between speciations. E. setting the geological time scale according to the position in which the fossil was found in the rock and investigating where the least common ancestor was found.
An extended period of torpor entered by an animal during the winter when the environment is too cold
and food is too scarce is called
a. estivation. b. hyperthermia. c. thermal acclimatization. d. hypothermia. e. hibernation.
In generalized transduction, a phage introduces a segment of donor DNA into the recipient cell. This is followed by recombination of the donor fragment with the recipient chromosome. Which of the following must occur?
A) circularization of the donor fragment before recombination B) a pair (or even number) of crossovers between the donor segment and the recipient C) degradation of one of the two strands of phage genome D) replication of the donor segment before recombination E) a single crossover between the donor segment and the recipient chromosome
In the food chain below, what does the blue jay represent?crabgrass-cricket-garden spider-blue jay-red-tailed hawk
A. Herbivore B. Primary carnivore C. Primary producer D. Secondary carnivore E. Detritivore