Huntington's disease is caused by:
a. a rare recessive allele.
b. a repeat of a nucleotide triplet in a gene.
c. a monosomic condition.
d. a dominant X-linked allele.
e. a deletion of part of chromosome 4.
B
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Telomerase activity in stem cells is very low
A. true B. false
Which process produces multiple proteins from the same primary transcript in the same cell?
A. chromatin remodeling B. histone modification C. combinatorial control D. alternative splicing E. RNA editing
Which of the following two terms relate most closely to split genes?
A) 5'-cap, 3'-poly-A tail B) introns, exons C) elongation, termination D) heteroduplex, homoduplex E) transcription, translation
Why are enzymes considered important biological catalysts?
a. Enzymes lower the entropy of a biochemical reaction. b. Enzymes decrease the enthalpy of a biochemical reaction. c. Enzymes increase the free energy of a biochemical reaction. d. Enzymes supply the energy to initiate a biochemical reaction. e. Enzymes lower the activation energy of a biochemical reaction.