The apples from the apple trees Johnny Appleseed sold to homesteaders were mainly used to make ____
a. pies
b. apple juice
c. hard cider
d. jam
e. sauce
ANSWER: c
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What technique can be used to detect genetic defects in early stage embryos, prior to implantation?
a. genetic screening b. chorionic villus sampling c. PGD d. amniocentesis e. micromanipulation
Crossing over is facilitated by a ____ orientation between homologous chromosomes
a. tightly angled b. separated, perpendicular c. tight, perpendicular d. separated, parallel e. tight, parallel
Atoms that bear a positive or negative charge are known as:
A. ions
B. electrically neutral
C. magnetic
D. lacking nuclei
The master gene for male sex determination is located on _____
a. both X chromosomes b. each autosome c. the Y chromosome d. the X chromosome e. both X and Y chromosomes