For which of the following organisms is the sporophyte stage the dominant stage in the life cycle?
A. Liverwort
B. Fern
C. Moss
D. Charophyte
E. Green alga Chlamydomonas
Answer: B
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Griffith first proposed the "transformation principal" through his studies on Streptococcus pneumoniae bacterium. Which of the following molecules was later found to be responsible for this phenomenon?
A. protein. B. RNA. C. DNA. D. phage. E. bacteriophage.
The shoulder blade is the
a. tibia. b. patella. c. scapula. d. clavicle. e. tarsal.
The leading hypothesis for the origin of the jaw proposes that ______.
A. it resulted from mutations in the developmental regulatory genes that determine the morphology of the rudimentary vertebral elements B. it first occurred in the hagfish and the lamprey C. it first occurred in the early tetrapods D. it resulted from mutations in the developmental regulatory genes that determine the morphology of the gill arches
Which of the following is a potential risk of exotic species?
a) introduction of new diseases b) native species being outcompeted c) alteration of habitats d) all of these are potential risks