What are the key characteristics of arthropods?
A. Fused bodies, no exoskeleton, and jointed appendages
B. Segmented bodies, tough exoskeleton, and jointed appendages
C. Segmented bodies, no exoskeleton, and jointed appendages
D. Fused bodies, tough exoskeleton, and jointed appendages
Answer: B
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________ is when one species splits into two species or when one species transforms into another over time.
A. Convergent evolution B. Speciation C. Both reproductive isolation and speciation are correct. D. Reproductive isolation E. The founder effect
It has been predicted that genes may be involved in smoking initiation and/or current smoking behavior
Previously, large twin and family studies have provided evidence of this and an estimate of heritability (genetic contribution) of 37-55% for initiation and 46-59% for current smoking, depending on gender. A large group of researchers from several institutions composed a pathway- or-systems-based series of studies including SNP analysis, cellular location and protein interaction, replication with other samples, statistical analysis, and bioinformatics. What is a likely result? A) The study is unlikely to produce meaningful results because it is too diffuse in its methods. B) The samples used also correlate with behaviors like depression, often associated with smoking, and they may be finding depression-associated genes. C) Two specific genes, one for a transporter protein and one for an opioid receptor, are clearly shown to be causative in all members of each sample. D) A group of genes that tend to code for proteins with similar biological function have been identified to contribute significantly. E) Genome-wide association studies are of no practical use in studying human behaviors.
All cells have some characteristics in common; both prokaryotic and eukaryotic cells have
A) a nucleus and a cell membrane B) DNA and a cell membrane C) cytoplasm, a plasma membrane, and a nucleus D) cytoplasm, a plasma membrane, and DNA E) a cell membrane and cytoplasm
The number of hosts in the life cycle of a tapeworm is
A. one. B. two. C. three. D. different for different types of tapeworms.