Exchange of genetic material among different species is called
A. homolgous gene exchange.
B. horizontal gene transfer.
C. exon shuffling.
D. genetic recombination.
E. exon shuffling and or genetic recombination.
B. horizontal gene transfer.
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Which of the following statements is NOT true about sister chromatids?
A. They are identical DNA sequences. B. They are attached to each other at a region of their DNA sequence called the centromere. C. They are formed in the S phase of the cell cycle when the chromosome undergoes replication. D. They are formed when the prokaryotic circular chromosome attaches at the plasma membrane. E. All of these statements about sister chromatids are false.
Expression of a microRNA complementary in sequence to a gene _____ that gene
a. blocks transcription of b. replicates c. speeds transcription of d. inhibits translation of e. methylates the bases in
Which statement is true?
a. Roots are well preserved in the fossil record. b. Bryophyte rhizoids are larger and stronger than roots. c. Vascular tissue appears to predate roots in plants. d. The primary purpose of roots is water storage.
Since all action potentials are identical, the intensity of a sensation depends on:
a. whether a myelinated or unmyelinated neuron has been stimulated. b. the duration of the stimulation. c. whether the neuron stimulated is a pre- or postsynaptic neuron. d. the total number of neurons stimulated and the frequency of their discharge. e. the presence of an EPSP or IPSP, which allows for a graded response.