During embryonic development, which of the following is not a quality of inducer molecules?
A: They are generally produced by the same cells they affect.
B: They bind to receptors on the plasma membrane of target cells.
C: They act through signal transduction pathways.
D: They may be proteins.
E: Inducer molecules have all of the above qualities.
Answer: A: They are generally produced by the same cells they affect.
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Heterozygotes with the genotype HbA/HbS have
a. sickle cell anemia. b. malaria. c. blood type AS. d. Fanconi's anemia. e. sickle cell trait.
Which is an example of negative feedback?
A. TRH stimulates the anterior pituitary to release thyroid-stimulating hormone. B. FSH and LH stimulate the gonads to produce sperm or eggs. C. When the blood becomes dilute, ADH is no longer released from the hypothalamus. D. Uterine stretching sends nerve impulses to the hypothalamus that releases oxytocin that stimulates uterine contraction. E. Nursing action stimulates the hypothalamus to release oxytocin that triggers mammary gland milk production.
The engulfment of food particles by a heterotrophic protist cell is
What will be an ideal response?
The best way to directly observe Treponema pallidum is through ________ microscopy.
A. bright-field B. scanning electron C. dark-field D. phase contrast E. fluorescent