What is the importance of crossing-over?
A. It provides extra genetic material for the daughter cells.
B. It increases the likelihood that daughter cells contain different genetic material.
C. It produces the proteins that are associated with DNA in chromosomes.
D. It increases chromosome condensation.
E. It separates the homologous chromosomes
Answer: B. It increases the likelihood that daughter cells contain different genetic material.
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The genus Arthrobacter
A. plays an important role in the degradation of some herbicides and pesticides. B. is a significant component of the microbial flora of soil. C. forms heat resistant endospores. D. is a significant component of the microbial flora of soil and plays an important role in the degradation of some herbicides and pesticides.
A normally harmless substance that produces an immune response in some people is a(n):
a. pathogen b. cytokine c. histamine d. allergen e. antibody
A creature that does NOT have an endoskeleton is the
A. beetle. B. crocodile. C. sea sponge. D. starfish. E. shark.
Which of the following were instrumental in DISPROVING spontaneous generation?
a. Pasteur's experiments using a specialized swan-necked flask that prevented microbes from entering flasks open to the air. b. The theory set forth by Rudolph Virchow, stating that living cells arise only from preexisting cells. c. Needham's experiments showing that even boiled vials of meat broth, when covered, became cloudy, teeming with microorganisms after a few days. d. Spallanzani's experiment in which flasks of meat broth were boiled and then melted shut, preventing the passage of air altogether.