Using what you know about how carbohydrate monomers are linked to form polymers, explain why most animals can
digest starch more easily than cellulose?
What will be an ideal response?
ANSWER: Plant starches are held together by alpha (1-4) linkages, whereas cellulose is held together by
beta (1-4) linkages. These different linkages have very different properties, with the alpha (1-
4) linkages being more reactive than the beta(1-4) linkages, which tend to be more stable.
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Under anaerobic conditions, pyruvate can be broken down by ____
Fill in the blank with the appropriate word.
How do sensory cells communicate different types of information to the brain—touch versus light for example?
A. by firing action potentials at different frequencies in the same neuron B. by firing action potentials of varying amplitudes in the same neuron C. by using different neurons for different stimuli (e.g., light and touch) D. by using different kinds of electrical signals in the same neuron as the information is conveyed to the brain E. by using different kinds of receptor potentials in the same neuron
Atmospheric sulfur dioxide returns to Earth in rain as weak sulfuric acid
Indicate whether the statement is true or false
A gene that when mutated leads to organisms with structures in abnormal places is termed
A. Dominant B. Homologous C. Parsimonious D. Vestigial E. Homeotic