Which of the following describes an accurate order of events in translation?
A. Ribosomal translocation occurs before the first aminoacyl-tRNA molecule binds to the small subunit.
B. Initiation of translation occurs only after the small subunit dissociates from the mRNA.
C. The large subunit of the ribosome binds the mRNA before the small subunit.
D. The first aminoacyl-tRNA molecule binds to the small subunit before the large subunit binds.
D
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Which of the following is not true about the sequencing of Neanderthal DNA?
A. Neanderthal mitochondrial DNA shows the same haplotypes as human DNA. B. Small amounts of Neanderthal DNA are cloned into a library, and the cloned sequences are sequenced at random. C. Sequences obtained from random clones are compared with existing human genome and chimpanzee genome data bases. D. Segments derived from Neanderthal DNA can be distinguished from segments derived from bacteria or insects by computerized analysis. E. The data provides evidence that modern humans and the Neanderthals shared a common ancestor about 700,000 years ago.
The posterior lobe of the pituitary gland stores and secretes ____
a. ADH only b. TSH only c. oxytocin only d. ADH and oxytocin only e. ADH, oxytocin and TSH
If two nonsister species on the phylogenetic tree above differ from the other two in a single character state (say dark or light fur), how many character state changes (evolutionary events) are needed to explain this pattern?
a. one c. three b. two d. four
For extinct taxa:
a. the fossil record is the primary source of data for constructing phylogenetic trees. b. one would expect allied extant taxa from the same location to be very different. c. it makes sense to use an ad hoc explanation of how natural selection produced changes in a lineage even when it is uncertain how the biotic and abiotic environment changed over time. d. A and C. e. B and D.