Food moves through the digestive system with the aid of ________, special muscular contractions of the food tube.
Fill in the blank(s) with the appropriate word(s).
peristalsis
Food moves through the digestive system with the aid of peristalsis, special muscular contractions of the food tube.
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Experiments on selective adhesion between ectoderm, mesoderm, and endoderm derived from amphibian embryos
demonstrated that ____.
a. ectoderm cells have positive affinity for mesoderm cells but negative affinity for endoderm cells b. ectoderm cells have negative affinity for mesoderm cells but positive affinity for endoderm cells c. mesoderm cells have negative affinity for endoderm and ectoderm cells d. ectoderm cells have positive affinity for both endoderm and mesoderm cells e. endoderm cells have positive affinity for both ectoderm and mesoderm cells
You decide to do an experiment with isolated myofibrils to explore the effects of ATP hydrolysis on myofibril function. You do this by bathing the myofibrils in a solution that contains a modified form of ATP, which cannot be split into ADP and Pi. At what step will myofibril function be arrested by using this compound instead of unmodified ATP?
A. Myosin heads will be unable to bind to the actin filaments. B. There will be no block in the cycle, since ATP hydrolysis is not required for this process. C. The myosin heads will remain attached to the actin filaments after the power stroke. D. Myosin heads will bind to the actin filaments, but the power stroke will not occur and actin filaments will not slide over the myosin filaments. E. Myosin molecules will be unable to assemble into thick filaments. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you know about the role of ATP hydrolysis in myofibril function? 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?
An example of morphological divergence is the wing of a bat and the ____
a. hand of a human b. foot of a human c. femur of an elephant d. femur of a human e. leg of a chicken
Where does human herpesvirus 4 (EBV) become latent?
A. in sensory nerves B. in B lymphocytes C. in cytotoxic T lymphocytes D. in motor nerves E. in oligodendrocytes