What is parthenogenesis?
A. a modification of sexual reproduction in which an unfertilized egg develops into a complete individual
B. a sexual means of internal fertilization
C. an asexual means of reproduction by splitting or fission into several new individuals
D. a sexual means of reproduction by which cross-fertilization occurs between hermaphrodites
E. an asexual means of reproduction involving budding
Answer: A
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Consider a mutant organism that is unable to make the amino acid arginine. Knowing that the
metabolic pathway to production of arginine is ornithine ? citrulline ? arginosuccinate ? arginine, you test the ability of the mutant to grow in the presence of each one of these compounds, providing just one of the compounds in each of your tests. You find that the mutant can grow in the presence of arginosuccinate or arginine, but not in the presence of citrulline or ornithine. From this you can conclude that the product of the gene mutated in the mutant is most directly involved in production of ____.
a. arginine from ornithine b. arginosuccinate from citrulline c. citrulline from ornithine d. arginine from arginosuccinate e. arginosuccinate from ornithine
Objective evidence of disease as noted by an observer is called
A) a sign. B) a symptom. C) a syndrome. D) prodromal.
Enhanced immune responses to subsequent exposures to an antigen to which the body has already been exposed are known as ________ responses.
A. third-degree immune B. allergic C. primary immune D. memory E. autoimmune
)
A. The suspected pathogen infects animals but not humans. B. The suspected pathogen cannot be cultured in the laboratory. C. There is not a suitable experimental host for the suspected pathogen. D. The suspected pathogen produces disease both in humans and a suitable test animal. E. The disease is polymicrobial, caused by more than one pathogen.