Overexpression of ________ lead to the development of cancer in mice, and variations in their structure or amounts have been documented in various types of cancer cells.
Fill in the blank(s) with the appropriate word(s).
micro-RNAs
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Because of its unique structure, mutations on the Y chromosome:
A. are accumulated within individual Y chromosome lineages. B. generally only affect male reproductive structure and function. C. are helpful for mapping genes. D. are shared only with specific regions of the X chromosome. E. happen only rarely.
The ___ Echinoderm lineage is made up of brittle and basket stars, each with elongated, slender, somewhat snakelike
arms surrounding a well-defined central disk.
a. Echinoidea b. Ophiuroidea c. Crinoidea d. Holothuroidea e. Asteroidea
What cell type develops into plasma cells?
A) T cells B) macrophages C) helper T cells D) mast cells e) B cells
Which scientist specializes in categorizing and describing groups of organisms?
A) botanist B) entomologist C) herpetologist D) systematist