Transposable elements are considered to be "selfish" genes because they _____
A) have multiple promoters
B) require multiple RNA polymerases for transcription
C) reproduce without increasing the fitness of the host
D) do not produce mRNA
Answer: C
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Which of the following were key events in the evolution of vascular plant leaves? Select all correct choices
A. the conversion of stems (or branches) to flattened structures B. the development of apical meristem identity genes C. the development of leaf meristematic cells D. the development of leaf identity genes
The body pattern of plants
A. is determined by the orientation of the first zygotic cell division. B. is determined by sunlight. C. is determined by three axes. D. develops in segments.
Which of the following cells would undergo osmotic lysis?
a. gram- cell in distilled water b. gram- cell in salt water c. gram+ cell in distilled water plus penicillin d. gram+ cell in salt water
The first pair of walking legs in a crayfish, lobster, crab, and their relatives, that is enlarged with a terminal claw is the
a. Protopodite b. Statocyst c. Cheliped d. Pedipalp e. Exopodite