We know that from their mother's milk, infants gain proteins called antibodies that protect them from specific germs. We also know that proteins will eventually be broken down by a person's digestive system. How is it that these antibodies can get into
the bloodstream of the breast-feeding infant intact? Use only the information from this chapter.
What will be an ideal response?
It appears that the child's digestive system engulfs the proteins by the process called pinocytosis before the chemicals can be broken down.
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What is true of most deciduous trees in the temperate zone?
a. they spend all of their energy on reproduction b. growth and reproduction occur simultaneously c. they only produce one or two offspring annually d. they produce thousands of seeds for one or two years e. they only begin to breed after reaching adulthood
. Which of the following statements about
exergonic reactions is false? a. They release energy. b. Glucose metabolism is an example. c. Their products have more energy than the reactants. d. Some energy is converted to less biologically useful forms. e. Bonds are broken
In the life cycle of the brown alga Laminaria, which stage represents the young sporophyte?
1.A
2.B
3.C
4.D
5.E
A notochord is
A. a strip of cartilage that forms a back and tail in all vertebrates. B. a stiff dorsal supporting rod that is replaced by the vertebral column during development. C. a stiff ventral supporting rod. D. replaced by the nerve cord during development. E. All of the choices are correct.