Larger substances can exit and enter a membrane by
What will be an ideal response?
exocytosis and endocytosis
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Which of the following defines a hypothesis?
a. A suggested and testable explanation for an event b. A form of logical thinking based on observations c. A description of a behavior or natural occurrence d. A research method that relies on experiments
The current model of cancer development is that
A) cancer develops from a single cell that evolves through one to two mutations. B) cancer develops from a single cell that evolves through multiple mutations. C) cancer develops from multiple cells that evolve through multiple mutations. D) cancer develops from multiple cells that evolve through one to two mutations.
Which of the following is the binding site for RNA polymerase on the DNA molecule?
a. structural genes. b. repressor gene. c. promoter sequence. d. operator sequence. e. region between an operator and the first structural gene.
The waterproof cuticle covering the epidermis of land plants helps prevent dehydration, much like the skin of some land animals. As a consequence of having a cuticle, what other evolutionary adaptation was important for most land plants?
A. Root hairs on the root epidermis B. Stomata in the leaves C. Trichomes on leaf surfaces D. The endodermis in the root E. Collenchyma fibers just beneath the surface of the epidermis