A fossil is defined as any evidence of an organism from at least
A. 10,000 years ago
B. 25,000 years ago
C. 100,000 years ago
D. 500 years ago
E. 1,000 years ago
A. 10,000 years ago
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Some ________ influence histone modification reactions.
A) microRNAs B) histones C) p53 genes D) scaffolding proteins E) tumor suppressors
Matching I. Choose the most appropriate answer for
each. 1. ___ colchicine 2. ___ deletion 3. ___ duplication 4. ___ inversion 5. ___ monosomy 6. ___ translocation 7. ___ triploidy 8. ___ trisomy A. 3n; generally sterile B. a chromosome segment is permanently transferred to a nonhomologous chromosome C. (2n – 1); a zygote deprived of a chromosome D. a repeat of a particular DNA sequence in the same chromosome or in nonhomologous ones E. (2n + 1); three chromosomes of the same kind are present in a set of chromosomes F. a piece of the chromosome is inadvertently left out during the repair process G. inhibits microtubule assembly; used in karyotyping H. a chromosome segment that has been cut out and rejoined at the same place, but backward
__________ are cells that synthesize bone, whereas
__________ break bone down. Fill in the blank(s) with the appropriate word(s).
A DNA molecule containing 32% thymine would contain how much cytosine?
A. 32% B. 36% C. 18% D. 64%