ATP molecules are catalysts that lower the activation energy needed to initiate a reaction.
Answer the following statement true (T) or false (F)
False
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In a developing embryo, different cells begin to transcribe different master genes, depending on where they fall within a gradient of ________
a. protein products of embryonic mRNAs b. homeodomains c. temperature d. protein products of maternal mRNAs
Which of the following is NOT true of seedless vascular plants?
a. Sporophytes are independent of gametophytes. b. Water is not needed for gamete transport. c. Sporophytes have vascular tissue. d. Seeds are not produced. e. Living members still exist
In a chemical reaction, the element 13Al will most preferably ________.
A) lose three electrons and become positively charged B) gain five electrons and become negatively charged C) lose five electrons and become positively charged D) gain three electrons and become positively charged
A horseshoe-shaped crown of tentacles used by many invertebrates for feeding is called a
A. protostome. B. rhizophore. C. trochophore. D. lophophore. E. fimbrium.