Ciliate sexual reproduction by conjugation differs from sexual reproduction in most animals in that
A. both parents are converted into zygotes.
B. the zygotic nucleus is diploid.
C. cell fusion occurs during fertilization.
D. meiosis occurs in both partners.
Answer: A
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Current scientific thought places organisms in one of kingdoms
(a) two. (b) four. (c) five. (d) six.
Which of the following is referred to as a hollow ball of cells?
a. cleavage b. egg c. gastrula d. zygote e. blastula
The rate of decomposition is greatest in
A) cold and moist environments. B) cold and dry environments. C) warm and moist environments. D) warm and dry environments.
Bacteria perform the following ecological roles. Which role typically does not involve symbiosis?
a. Skin commensalist b. Pathogen c. Decomposer d. Bioluminescent bacteria in fish e. Gut mutualist