In Addam's family, there is an autosomal dominant condition in which webbing attaches the second toe to the third toe and the second toe is longer than the big toe. Only some of the members who have inherited the mutant allele have a second toe longer than the big toe. In addition, the extent of webbing varies. This phenotype is
A) both inherited and non-inherited.
B) dominant and recessive.
C) variably expressive and incompletely penetrant.
D) invariably expressive and completely penetrant.
C) variably expressive and incompletely penetrant.
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Which of the following statements regarding plants' ability to sense their environment is not true?
A. Photoreceptors allow plants to sense light availability. B. Plants have chemical receptors that allow them to detect and respond to chemical gradients. C. Plants have mechanical receptors that allow them to sense the Earth's gravitational field. D. Plants contain touch-sensitive genes that allow them to respond to wind. E. Plants have difficulty detecting temperature and so, rely on light wavelengths.
Which type of DNA library (genomic or cDNA) would include introns and promoters?
What will be an ideal response?
Imagine that you have an atom of sodium (Na), which has two electrons in its innermost shell, eight electrons in its middle shell, and one valence electron in its outermost shell. In this atom, which electron would have the greatest amount of potential energy?
a. the valence electron b. an electron in the middle shell c. an electron in the innermost shell d. All of the electrons in this atom would have equal amounts of potential energy.
Which of the following is NOT strictly a freshwater community?
A. ponds B. streams C. estuaries D. lakes E. rivers