You are presented with an animal that resembles a jellyfish. As you examine it further, which characteristic would allow you to conclude that it belongs to the Phylum Ctenophora rather than the Phylum Cnidaria?
A. complete digestive tract.
B. tentacles.
C. gonads.
D. stinging cells.
A. complete digestive tract.
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In a normal mammalian birth, how does the body guarantee that birth proceeds to completion?
A. Via positive feedback -- stretching of the uterus by the descending fetus induces release of oxytocin from the posterior pituitary causing even stronger uterine contractions. B. Via negative feedback -- stretching of the uterus by the descending fetus induces release of FSH and LH from the posterior pituitary causing even stronger uterine contractions. C. Via positive feedback -- stretching of the uterus by the descending fetus induces release of prolactin from the posterior pituitary causing even stronger uterine contractions. D. Via negative feedback -- stretching of the uterus by the descending fetus induces release of prostaglandins from the posterior pituitary causing weaker uterine contractions.
Four of the five substances listed below are
cofactors or coenzymes. Select the exception. a. mineral b. water-soluble vitamin c. metallic ions d. NAD+ e. protein
A particular chemical reaction is exergonic. What can you say about the relationship between the reactants and the products in this exergonic reaction?
A. The reactants cannot spontaneously react to generate the products. B. The reactants likely have lower enthalpy than the products. C. The reactants have more free energy than the products. D. The reactants are likely more disordered and the products are likely more ordered.
The most primitive primates are considered to be the
What will be an ideal response?