__________ refers to an individual's observable traits. Fill in the blank(s) with the appropriate word(s)
ANSWER: Phenotypic
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Genetic drift is most likely to lead to ____
a. artificial selection b. mutation c. the founder effect
d. gene flow e. adaptation
When exploring the Universe, looking for life, most scientists agree we should look for “carbon-based life forms.” Why is carbon considered so important to life?
a. Carbon atoms are a minor but very important component in lipids which are needed for life. b. The Carboniferous Period is a geological period on Earth when carbon was very prevalent. It is believed that all planets with life must pass through this period. c. The carbon atom’s ability to form four covalent bonds to as many as four different atoms makes it a fundamental structural component in the organic macromolecules. d. Carbon atoms make matter that burns readily, and it is believed that life could not develop without fire.
Which of the following allows groups of skeletal muscle cells to perform coordinated contractions? (2 points)
a. Their sarcolemma is fused to the tendons, allowing them to function without continual nerve stimulation. b. Their cells are branched and joined end to end, allowing them to function without continual nerve stimulation. c. They contain a complex network of striations, allowing more efficient cell-to-cell communication d. They are connected into multinucleate tissues, allowing more efficient cell-to-cell communication.
If a cell containing 20 chromosomes divides by mitosis, a total of how many daughter cells will be produced?
a. 1 b. 2 c. 3 d. 4 e. 5