Which of the following statements is consistent with the assertion that protists are paraphyletic?
A) Some protists evolved into other eukaryotic groups.
B) Protists all share a common set of synapomorphies.
C) Protists are all more primitive than land plants and animals.
D) Protists do not share a single common ancestor.
Answer: A
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The largest mass extinction occurred at the end of the:
A. Ordovician. B. Devonian. C. Permian. D. Triassic. E. Cretaceous.
In this generalized illustration of gametogenesis, the
four cells in the right column should be labeled a. sperm. b. eggs. c. ovum and three polar bodies. d. secondary spermatocytes. e. diploid.
Which hormone stimulates the distal tubules to reabsorb more sodium?
a. ADH b. renin c. angiotensin I d. angiotensin II e. aldosterone
What term describes the implantation of the blastocyst in a place other than the uterus?
a. menstruation b. gastrulation c. ectopic pregnancy d. endometrial pregnancy e. conjoined pregnancy