The fluid that enters vertebrate nephrons is called the filtrate. What is the source of the filtrate?
a. blood in capillaries
b. urine
c. lymphatic fluid
d. cells of the kidney
e. the loop of Henle
Answer: a. blood in capillaries
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Why was it important for Mendel to remove the anthers from pea plants in his experiments when crossing two different true-breeding pea plants?
A. To prevent self-fertilization B. To make sure self-fertilization would occur C. To protect the pea plants from environmental pollen D. To stimulate the pea plants to ovulate
Compare and contrast the events and results of oogenesis and spermatogenesis. What will be an ideal response?
Which of the following animals do not have a four-chambered heart with two separate pumping systems?
A. hummingbirds B. lizards C. cats D. crocodiles E. elephants
Application of heat to living cells can result in all of the following EXCEPT
A) breaking of hydrogen bonds. B) alteration of membrane permeability. C) denaturation of enzymes. D) decreased thermal death time. E) damage to nucleic acids.