A ____________ is an abnormally growing mass of cells that is actively spreading through the body.
Fill in the blank(s) with the appropriate word(s).
malignant tumor
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Which statement best describes the relationship between a carpel and a pistil?
A. The two terms are merely two names for the same thing. B. A pistil is part of a male component of the flower whereas a carpel is part of a female component. C. A pistil can be composed of either a single carpel (in which case the two terms are synonymous) or of two or more carpels fused together. D. A pistil is a reproductive part of a flower whereas a carpel is a showy vegetative part. E. A pistil is part of the female component of a flower and a carpel is not even a flower part at all.
The Ames test is useful as a rapid screening test to identify those compounds that
A. will respond to chemical agents. B. are mutagens. C. respond to the deletion of DNases. D. will protect an organism from cancer. E. will respond to chemical agents AND will protect an organism from cancer.
Answer the following statements true (T) or false (F)
1. When lactose becomes available the genes encoding b-galactosidase and lactose permease are upregulated in E. coli. 2. Different globin polypeptides are expressed at similar levels during the embryonic and fetal stages of mammalian development. 3. Small effector molecules directly bind the DNA they regulate. 4. Both eukaryotes and prokaryotes require a promoter region for gene transcription. 5. A cis-effect is a form of gene regulation that can occur between two DNA segments that are not physically adjacent.
The symmetrical pattern of yolk distribution in a sea urchin represents the beginnings of radial
symmetry.
Indicate whether the statement is true or false.