All of the following are advantages of a bioreactor instead of a flask culture EXCEPT
A) larger culture volumes can be grown.
B) instrumentation for monitoring environmental conditions.
C) uniform aeration and mixing.
D) aseptic sampling.
E) None of the answers is correct; all of these are advantages of using a bioreactor instead of a flask culture.
E
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When X-linked traits are recessive,
A. males who express the trait receive the recessive allele from their mothers. B. males who express the trait receive the recessive allele from their fathers. C. males who express the trait must receive recessive alleles from both parents. D. males who express the trait carry the recessive allele on their X chromosome. E. males who express the trait receive the recessive allele from their mothers and carry the recessive allele on their X chromosomes.
Archaeopteryx lithograpica:
A. was the first fossil directly linking birds to reptiles B. had a beak with teeth C. had a small, reptilian breastbone D. had both claws and feathers on the wings E. All of the choices provided are true
Cilia and flagella are most directly involved in:
a. metabolism. b. movement. c. maintaining homeostasis. d. muscle contraction. e. cell signaling
In the late 1920s, a mutation occurred in many silver fox farms around the world. The fox farms that sold expensive furs were proud of the quality of their furs, and each advertised that it had the best, purest breed of all the fox farms. The new mutations produced a "platinum" coat pattern that was commercially desirable, so the farms crossed them to get more. The results of their breeding experiments were as follows: (1) silver ´ silver >>> all silver offspring; (2) silver ´ platinum >>> equal numbers of silver and platinum; (3) platinum ´ platinum >>> two platinum for each silver offspring. Which of the following inheritance patterns explain the breeding results?
A. Incomplete dominance of the silver trait B. Codominance of the silver and platinum alleles C. Multiple alleles exist that cancel out some traits D. Heterozygotes express the recessive platinum trait E. Homozygous alleles cause lethal effects