Two oocytes released from the same ovary at the same time and fertilized by two sperm results in
A) monozygotic twins.
B) dizygotic twins.
C) blighted ova.
D) cloned embryos.
B) dizygotic twins.
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Several species of sea urchins may inhabit the same tide pool and their reproductive periods overlap. Although they practice external fertilization, they seldom interbreed because eggs produce chemicals that are only attractive to sperm of their own species. This is an example of a _________ barrier that _______________.
A. prezygotic; causes geographic isolation B. prezygotic; causes temporal isolation C. prezygotic; prevents gamete fusion D. postzygotic; prevents zygote fusion E. postzygotic; causes hybrid infertility
Which of the following tissue types is specialized to conduct electrical signals?
A. nervous B. muscular C. epithelial D. connective E. Both nervous and epithelial tissue are correct
Components typical of plant cells but not of animal cells are
a. nuclei. b. cell walls. c. mitochondria. d. ribosomes.
Which statement about dinosaurs is FALSE?
a. Some species lived in social groups and hunted in packs. b. Dinosaurs were all slow-moving, with relatively low metabolic rates. c. Fossils of dinosaurs with feathers suggest that feathers first evolved to provide insulation. d. Dinosaur social behaviors include courtship rituals and parental nurturing of the young. e. Dinosaurs underwent an extensive radiation throughout the Jurassic and Cretaceous periods