Explain the process of swallowing.
What will be an ideal response?
Swallowing starts with a voluntary phase in which the tongue pushes food against the soft palate. The soft palate closes off the nasal cavity, and the epiglottis closes off the larynx so the food enters the esophagus. Peristalsis moves the food through a sphincter into the stomach.
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Air-breathing insects carry out gas exchange _____
A) in their specialized external gills B) in their specialized internal gills C) in the alveoli of their lungs D) across the finest branches of the trachea and cell membranes E) across all parts of their thin cuticular exoskeleton
Cytogenetic is
A. A photographic representation of chromosome. B. The field of genetics that involves the microscopic examination of the chromosomes and cell division. C. The sorting process to divide one cell nucleus into two nuclei. D. The process in which the two nuclei are segregated into separate daughter cells' E. The process by which the haploid cells are produced from a cell that was originally diploid.
The spaces between adjacent Schwann cells are called
a. nodes of Ranvier. b. axon terminals. c. dendrites. d. intercalated discs. e. active gaps.
The accompanying figure represents a chromosome at metaphase of mitosis. How many DNA molecules are present in this chromosome?
A) one B) two C) four D) more than four E) impossible to determine