According to the graph, at what maternal age is the incidence of Down syndrome equal to five times the incidence at age 40?
A) about 29 or 30
B) about 35 or 36
C) about 44 or 45
D) about 46 or 47
Answer: C
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Which approach could be used to investigate distinctions between a muscle cell and a bone cell?
A) Gene expression profiling B) DNA variation screening C) Microarray comparative genomic hybridization D) Transcription-mediated amplification
Crops have been genetically modified to resist the herbicide ____
a. glyphosate b. DDT c. triazine d. 2, 4-D e. atrazine
Which of the following types of cells does HIV preferentially infect?
A) cytotoxic T cells B) natural killer cells C) helper T cells D) phagocytic cells
Bacteria differ from Archaea in that
A. Archaea have peptidoglycan in their cell walls. B. Bacteria have peptidoglycan in their cell walls. C. Archaea have DNA which is in the shape of a ring. D. Bacteria have DNA which is in the shape of a ring.