When DNA is cut with a restriction enzyme, the resulting fragments have
A) 5' carboxyls.
B) 5' hydroxyls.
C) 3' hydroxyls.
D) 3' phosphates.
E) 3' carboxyls.
C
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In honeybees, queen bees are haploid organisms while male drones are diploid
a. True b. False
One advantage that angiosperms have is a unique triploid ____, a nutritive tissue produced during
fertilization.
a. seed coat b. endosperm c. ovule d. pollen sac e. ovary
Which of the following is TRUE at the end of telophase I in corn (2n = 20)?
a. Each cell has 20 chromosomes. b. Each chromosome is paired with its homologue. c. Centromeres connect homologous chromosomes. d. Each cell is diploid. e. Centromeres connect sister chromatids.
The rapid growth of the human population still seen today began in the
A) 1200s. B) 1400s. C) 1700s. D) 1800s. E) 1900s.