____________________ tissues covering the body's surfaces and lining its internal spaces are the initial site of most cancers because their cells are rapidly dividing.
Fill in the blank(s) with the appropriate word(s).
Epithelial
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Based on the arrangement of vascular tissue, how could you distinguish the upper versus lower surfaces of a leaf?
What will be an ideal response?
The maximum number of bonds that can be formed by an atom:
A. is dependent on the valence of that atom. B. is dependent on the number of unpaired electrons in its outer shell. C. can be made up of a combination of single and double bonds. D. is atom specific; for example, carbon can form four bonds, whereas oxygen forms two. E. All of these choices are correct.
Transformation of bacteria was shown to occur when ________ bacteria were injected into mice and the mice ________.
A. live S strain; died B. live S and R strain; died C. live R strain and dead S strain; died D. live S strain and dead R strain; didn't die E. live R strain; didn't die
In negative control, a gene is switched off when _____
A) a kinase adds a phosphate to DNA B) lactose is transported into the cell C) a regulatory protein binds to DNA and shuts down transcription D) a regulatory protein is removed from DNA and shuts down transcription