Grizzly bears have large geographic ranges that consist of mosaics of forests and grasslands at varying altitudes. Grizzlies also require relatively pristine water sources in their range. Based on this, what species type best describes grizzly bears?
A. flagship species.
B. endemic species.
C. indicator species.
D. keystone species.
E. umbrella species.
Answer: E
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If you were to dissect a root, the layers from outside to inside would be:
A. epidermis cortex endodermis phloem xylem. B. cortex epidermis phloem endodermis xylem. C. epidermis cortex endodermis xylem phloem. D. endodermis cortex epidermis phloem xylem. E. epidermis endodermis cortex phloem xylem.
Cardiac muscle cells are associated with
a. bundles. b. a sheath of dense connective tissue. c. voluntary responses. d. cells tapered at both ends. e. communication junctions.
In humans, the 30S pre-RNA transcript yields three rRNA segments following transcription and RNA cleavage. What RNA transcripts are generated by the 30S pre-RNA transcript in E. coli?
A) two rRNAs (15S each) B) three rRNAs (5S, 16S, and 23S) C) two tRNA transcripts D) three rRNAs (5.8S, 18S, and 28S) and two tRNA transcripts E) three rRNAs (5S, 16S, and 23S) and two tRNA transcripts
Paleontologists have pieced together from fossils the evolution of the whale from:a
aquatic reptiles. b. four-legged, land dwelling mammals. c. sharks. d. porpoises. e. extinct aquatic birds.