An element has eight protons, nine neutrons, and eight electrons. Its atomic number and atomic mass, respectively, are __________.
a. 8 and 16
b. 8 and 17
c. 9 and 16
d. 9 and 17
e. 16 and 8
Answer: b. 8 and 17
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How did Bateson and Punnett's work with comb morphology in chickens differ from the dihybrid work of Mendel?
A. They were working with sex-limited traits. B. Their F2 offspring displayed 4 unique phenotypes, not the four combinations of two phenotypes expected in a Mendelian cross. C. ½ of their combinations were lethal. D. The expression of their trait varied by the environment in which the chickens were raised.
Which organ system includes the pituitary, thyroid, and adrenal glands?
a. endocrine system b. reproductive system c. lymphatic system d. respiratory system e. skeletal system
If a cell has the same concentration of dissolved molecules as its outside environment, the cell's condition is referred to as being
A. hypertonic. B. hydrophilic. C. hydrophobic. D. hypotonic. E. isotonic.
The two strands of a DNA double helix are held together by _____ that form between pairs of nitrogenous bases
a. ionic bonds b. covalent bonds c. hydrophilic interactions d. S—S bonds e. hydrogen bonds