Which statement is NOT true of diffusion?
a. The process requires a concentration gradient.
b. The particles diffuse faster when the concentration gradient is steep.
c. The uncharged particles also move down electrical gradients.
d. Each particle moves down its own concentration gradient.
e. The process requires ATP.
ANSWER: e
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transcription factors. b. genetic switches such as operators. c. repressors. d. insulin-like growth factors. e. morphogens.
Sexual reproduction in multicellular Ascomycota leads to the production of
A) asci. B) basidia. C) conidia. D) sporangia E) zygotes.
Current classification of prokaryotes is based on
A. occurrence of transverse binary fission. B. type of colony formation. C. ability to stain the cell wall with Gram stain. D. sequencing of proteins, DNA, and RNA. E. morphology of flagella.
Which of the following is incorrect about transfer RNA?
A. The initiator tRNA that binds to the P site has the anticodon UAC. B. has a bottom hairpin loop with an anticodon C. contains a binding site for an amino acid D. An anticodon is complementary to a codon. E. Initiator tRNA in bacteria carries tryptophan.