The beaks of birds are well suited to the type of food they eat. This result arises from
What will be an ideal response?
adaptations that occur as part of natural selection leading to a closer and closer fit between organisms and their environment.
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Actively transcribed regions of eukaryotic chromatin have a diameter of approximately:
A. 10 microns B. 2 nanometers C. 30 nanometers D. 1400 nanometers E. 10 nanometers
Which of the following hypotheses relies on the chemical reaction between hydrogen sulfide (HS2) and iron (Fe) for the built up of a H2 concentration gradient to provide the necessary energy for the reduction of N2 to NH3?
A. Reducing Atmosphere Hypothesis. B. Extraterrestrial Hypothesis. C. Deep-Sea Vent Hypothesis. D. Both Reducing Atmosphere and Extraterrestrial Hypotheses. E. All three hypotheses use this exact reaction to create a chemical gradient to form amino acids.
Which of the following represents the correct sequence of cell types through which an electrical signal would pass in a reflex arc?
A. sensory neuron ? interneuron in the CNS ? motor neuron B. motor neuron ? interneuron in the PNS ? sensory neuron C. sensory neuron ? motor neuron ? interneuron in the CNS D. motor neuron ? sensory neuron ? interneuron in the PNS E. sensory neuron ? motor neuron ? interneuron in the CNS
Plasma membrane permeability of which of the following ions is most important in generating the resting membrane potential?
A) sodium ions B) potassium ions C) chloride ions D) calcium ions E) None of the above generates resting membrane potential.