From the mouth, food next enters the _______.
a) pharynx
b) esophagus
c) trachea
d) alveoli
Ans: a) pharynx
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Genetic counselors are available for diagnosing some diseases, and for helping in family planning. If a genetic counselor examines a pedigree chart and notices an occurrence of a disease in every generation, she has evidence that the disease is caused by
A. an autosomal dominant disorder. B. a chromosomal abnormality. C. having an extra set of chromosomes. D. an autosomal recessive disorder. E. a new reoccurring mutation.
A DNA site called a ________ is the binding location for a transcriptional repressor.
Fill in the blank(s) with the appropriate word(s).
Gene expression in multicelled eukaryotic cells changes in response to _____
a. conditions outside the cell b. master gene products c. operons d. conditions outside the cell and master gene products
What distribution pattern is the most common
in the natural world? a. random b. uniform c. clumped d. stratified or layered e. homogeneous