Which of the following is probably the main factor responsible for the phenomenon of density-dependent inhibition?
A) a local accumulation of growth-inhibiting factors
B) cells' innate ability to "sense" when the organ of which they are a part has no need for additional cells
C) a local deficiency of nutrients
D) physical contact of cell-surface proteins between adjacent cells
Answer: D
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Use the following information to answer the following question(s): You wake up one morning feeling slightly under the weather. A close family member enthusiastically suggests that you take some Echinacea, an herb commonly used as a cold remedy. You then decide to design an experiment to test Echinacea and see if this claim is true. You think, "If taken at the beginning of a cold, Echinacea will reduce cold symptoms."If you give 100 sick people tablets similar to Echinacea but with no herb (called a placebo), and do not tell them whether they are receiving the placebo or the Echinacea tablet, what kind of control would this be?
A. A positive control, since you are expecting a change to happen in this control group B. A blind control, since the sick people do not know whether they are receiving the placebo or the Echinacea C. A negative control, since you are expecting no change to happen in this control group D. Both B and C are correct
The closed end of a nephron forms a cup-like structure called a Bowman's capsule or a ______?
Fill in the blank(s) with correct word
The sebaceous glands associated with hair follicles produce ________
A) sweat B) sebum C) androgens D) keratin
Which of the following is a true statement about meristems? Select all that apply.A) They can be apical or lateral.B) Meristematic cells divide into two cells, one of which remains a meristem cell and another that becomes a plant body cell.C) Apical meristems give rise to three types of embryonic tissues.D) Meristematic cells are found only in eudicots and not in monocots.E) They are responsible for primary and secondary growth.
What will be an ideal response?