Which statement is NOT true of the epidermis of a plant?
A. Root hairs increase the surface area of epidermal cells on roots.
B. The epidermis covers the entire body of a herbaceous plant.
C. The epidermis is impervious to gas exchange.
D. Cork cells replace epidermal cells on older woody plants.
E. Guard cells are specialized epidermal cells found on root surfaces.
Answer: E
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The concept of homeostasis originated with
A. Claude Bernard. B. Charles Darwin. C. James Watson. D. Rosalind Franklin. E. Gregor Mendel.
Lethal mutations can be maintained in diploid organisms if they are ________.
A. deletions B. recessive C. dominant D. None of the choices are correct.
The lactose operon is likely to be transcribed when _____
A) there is more glucose in the cell than lactose B) there is glucose but no lactose in the cell C) the cyclic AMP and lactose levels are both high within the cell D) the cAMP level is high and the lactose level is low
Which one of the following is an example of a latent viral infection in humans?
a) Measles b) HIV/AIDS c) Shingles d) Influenza