Any microorganism that spends a portion of its life associated with another organism of a different species is engaged in ________.
A. synergy
B. parasitism
C. commensalism
D. symbiosis
Answer: D
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In most flowering plants, one sperm nucleus fuses with an egg forming a zygote that develops into an embryo. Another sperm nucleus fuses with ____
a. the endosperm mother cell to produce three cells, each with one nucleus b. the endosperm mother cell, forming a diploid cell c. the endosperm mother cell, forming a triploid (3n) cell d. one of the smaller megaspores to produce what will eventually become the seed coat e. one of the smaller megaspores to produce a diploid endosperm
Scientists in Scotland figured out a novel method to clone cells successfully. It involved
A. using an egg that was in cytokinesis and a nucleus that was in S stage of the cell cycle. B. using an egg that was in the S stage of the cell cycle and a nucleus that had just entered prophase. C. using an egg that was in the S stage of the cell cycle and a nucleus that just passed through telophase. D. using an egg and a nucleus that were at the same stage of the cell cycle.
Water fleas, Daphnia magna, can switch between asexual and sexual reproduction cy-cles. Which of the following observations support(s) the hypothesis that sex is favored in unpredictable environments?
a. The introduction of predators triggers sexual reproduction. b. Daphnia reproduces asexually every other generation in a variety of habi-tats. c. Daphnia reproduces sexually when its aquatic habitat dries up. d. Asexual D. magna strains outcompete introduced competitors. e. A and C.
An arthropod exoskeleton is composed of
A) chitin. B) calcium carbonate. C) cellulose. D) lignan. E) silica.