Which scientific investigation would provide the most information about the interactions among body systems in animals?
a) an investigation studying how muscle movement is triggered by nerve signals
b) an investigation studying the structures involved in the elimination of urine and feces from the body
c) an investigation studying the rate of gamete production in different animals
d) an investigation studying the physical changes that food undergoes in the stomach
Ans: a) an investigation studying how muscle movement is triggered by nerve signals
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A key difference between hormonal regulation of the reproductive systems of males and females is that:
A. LH and FSH are released only in females. B. LH and FSH are released only in males. C. LH and FSH are released cyclically in females but nearly continuously in males. D. LH is released in males and FSH is released in females. E. LH is released continuously in males and FSH is released cyclically in females.
To make a transgenic Huntington Disease mouse, a copy of the mutant human HD gene was cloned into a vector, and the next step was to _____
1.transfer the vector directly into the foster mother mouse 2.microinject the vector into the nucleus of a fertilized mouse egg 3.transform bacteria using the engineered plasmid 4.insert the sequence into the genome of a virus and infect a mouse with the virus
Blood slows down in arterioles due to the large cross-sectional area.
a. true b. false
Which of the following is a parasitic protist that is spread by Anopheles mosquitoes?
A) Giardia B) Trichomonas C) Plasmodium D) Pfisteria E) Paramecium