Boundaries offer unique habitats
A) that offer relatively easy access to adjacent communities.
B) that do not offer easy access to adjacent communities.
C) that support only species specially adapted to the boundary environment.
D) whose composition is almost exactly the same as adjacent communities.
A
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Before Mendel's experiments with pea plants, which ideas formed the basis for most thinking about heredity? Check all that apply.
_____ species gradually change over time _____ the traits of both parents are blended together in their offspring _____ heredity occurs within species _____ some traits are dominant and some are recessive _____ traits are transmitted directly from parents to offspring
Protein-encoding genes in eukaryotes are transcribed by
a. RNA polymerase I. b. RNA polymerase II. c. RNA polymerase III. d. either RNA polymerase I or III. e. either RNA polymerase II or III.
Which subatomic particles have a negative charge?
a. neutrons only b. protons only c. electrons only d. both neutrons and protons e. both protons and electrons
What is considered to be the first evidence of differentiation in the cells of an embryo?
a) the occurrence of mRNAs for the production of tissue-specific proteins b) cell division occurring after fertilization c) changes resulting from induction d) determination of specific cells for certain functions e) changes in the size and shape of the cell