Cultures grown from cells of a dissociated tissue are called
a. normal cell lines.
b. transformed cell lines.
c. primary cell cultures.
d. immortal cell lines.
Ans: c. primary cell cultures.
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The outcome of cleavage during embryonic development is the production of a
A. blastula. B. gastrula. C. neurula. D. substantially larger embryo. E. None of the choices are correct.
A cell with a diploid number of 20 will have how many chromosomes at the end of meiosis?
A) 40 B) 10 C) 20 D) 5
The mechanism for excreting nitrogenous waste in aquatic animals was ineffective on land because
A) land animals concurrently developed a more efficient reproduction system. B) land animals found better food sources. C) land animals had a more difficult time with water balance than aquatic species. D) aquatic animals did not have as much protein in their diets as did land animals.
Human babies and animals adapted to the cold are able to maintain their body temperatures because of the presence of brown fat. The mitochondria in brown fat have a protein in them called thermogenin, which allows the flow of hydrogen ions back through
the inner mitochondrial membrane (bypassing the ATP synthase). Based on this and your understanding of cellular respiration, propose a mechanism by which brown fat helps keep babies and other animals warm. What will be an ideal response?