Migrating cells move around the developing embryo using ____
a. electrical signals
b. genetic markers
c. apoptosis
d. adhesive cues
e. osmosis gradients
ANSWER: d
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An example of a nonbiological factor that affects community structure is ____
a. mutualism b. competition c. parasitism d. predation e. rainfall
Club mosses
a. are placed in the subphylum Pterophyta. b. are so-called because of the social nature of the plants. c. do not produce gametophytes. d. are so-called because most produce strobili.
The diploid chromosome number of an organism is usually represented as 2n. Humans have a diploid chromosome number of 46. What would be the expected haploid chromosome number in a human?
A) 24 B) 12 C) 23 D) 92 E) 16
The double helix model of DNA suggested by Watson and Crick was exciting to the scientific community because:
a. it opened the door to new PCR based technologies. b. it explained how genetic material could be duplicated by means of the complementary strands. c. it suggested the role of DNA in protein synthesis. d. it proved once and for all that DNA was the messenger of heritable traits. e. All of the above are correct.