The earliest primates were:a
knuckle walkers.
b. bipedal.
c. brachiate.
d. quadrupedal.
e. arbore
E
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The owner of a plant nursery is introducing the new night janitor to his duties. “Behind this door are the poinsettias,” she said, “Please don’t clean this room, and leave the door closed.” Why might the owner say this?
A. Poinsettias are short-day plants that require a long uninterrupted period of darkness to flower. Even a short flash of light at night could prevent flowering. B. Poinsettias are very sensitive to the chemicals used in cleaning, which can interfere with the gibberellin-dependent pathway and disrupt flowering. C. Poinsettias are tropical plants and require constant warm temperatures for flower formation. D. Poinsettias are long-day plants that require a long period of light for flower formation, and this light might disrupt the day-night cycles of other plants outside the room. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about short-day and long-day plants? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Answer the following statements true (T) or false (F)
1. Research suggests a link between a mutation in the skin protein filaggrin and allergic reaction. 2. Vaccinating a substantial portion of the population against an infectious disease establishes "herd immunity." 3. Mitosis in a cancer cell can be compared to a runaway train that is racing along without signals and control points. 4. Invasive malignant tumors typically contain mutations that affect the cytoskeleton and allow the cell to move from where it is anchored. 5. Research has shown that a "cocktail" of several drugs, each acting on a different cellular pathway, is the best approach to treat many cancers.
At a source the phloem typically has a water potential that is ____ that in surrounding xylem
a. lower than b. about the same as c. higher than d. exactly the same as e. less negative than
Which of the following is (are) false regarding B
cells with antigen-MHC complexes? a. They are stimulated by helper T cells to secrete cytokines. b. Helper T cells signal them to divide and differentiate. c. On signals from the helper T cells, they produce clones with identical receptors. d. Once activated by signals from helper T cells, they produce IgG, IgA, or IgE immunoglobulins instead of membrane-bound IgM. e. All of these are true.