An elephant’s trunk does not have any bones. However, it has many muscles, and the tip has
very precise movements that allow it to pick a single leaf from a tree. What type of skeleton
allows this movement to occur?
a. hydrostatic skeleton
b. exoskeleton
c. antagonistic skeleton
d. pressurized skeleton
A
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When a single-gene mutation can have phenotypic effects at multiple stages of development, it is
A. pleiotropic. B. incompletely dominant. C. recessive. D. causing a disease. E. codominant.
A "rain shadow" describes
A) shadows cast by the mist and clouds that hover above the crest of a mountain range. B) forested conditions of mountain ranges. C) mountainous areas where dry descending air absorbs moisture and there is little precipitation. D) dark-colored chaparral vegetation that grows on the mountain ranges.
In human chromosomes, satellite DNA sequences of about 170 base pairs in length are present in tandem arrays of up to 1 million base pairs. Found mainly in centromere regions, these DNA sequences are called ________
A) telomeres B) telomere-associated sequences C) primers D) euchromatic regions E) alphoid families
Which method of inserting DNA into cells is illustrated in Figure 8.1?
A. protoplast fusion B. injection C. electroporation D. a gene gun E. transduction