A paraphyletic group contains
A. a common ancestor but not all of its descendants.
B. groups of species with different common ancestors.
C. a common ancestor and all of its descendants.
D. a common ancestor and all of its descendants but not the most recent common ancestor.
E. every species ever derived from a common ancestor.
A. a common ancestor but not all of its descendants.
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Alzheimer's disease and Parkinson's disease are both neurological diseases that result from ____
a. lack of acetylcholine production b. abnormal levels of specific neurotransmitters c. failure to remove neurotransmitters from the synaptic cleft d. too much dopamine production e. a failed reuptake of specific neurotransmitters
Many people hope that they will one day be able to travel into space for extended periods of time. What are the health risks to the bones and muscles of those people interested in such "space vacations"?
What will be an ideal response?
In horses, black coat color is influenced by the dominant allele (B), and chestnut coat color is influenced by the recessive allele (b). Trotting gait is due to a dominant gene (T), pacing gait to the recessive allele (t). If a homozygous black trotter is crossed to a chestnut pacer, which phenotype will be the most common in the F2 generation?
A. Black pacer B. Black trotter C. Chestnut trotter D. Chestnut pacer E. Both black and chestnut pacers
Silicon is an element that is found directly underneath carbon in the periodic table and thus has similar properties to carbon, including electron orbitals. How many electrons are in the valence shell of a silicon atom?
A) 1 B) 2 C) 4 D) 6