Multi-cellularity is believed to have evolved multiple times on Earth
Indicate whether the statement is true or false.
ANSWER: True
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How long does it take a sperm to reach the
oviduct?
a. 3 minutes b. 30 minutes c. 3 hours d. 3 days e. 30 days
Barringer Crater in Arizona was formed when
a 300,000-ton asteroid slammed into Earth 50,000 years ago. Which of the following is true about this event? a. It hit so early that it had little influence on the history of life. b. This one produced about 150 times the energy of the bomb that hit Hiroshima. c. Its impact produced a minor crater. d. Scientists recently disproved that an asteroid impacted our planet just prior to the mass extinctions at the K-T boundary. e. An asteroid impact releases only minor amounts of energy.
One goal of the Human Genome Project was to sequence the ____________________ (number of) chromosomes in
the human genome, including all autosomes and the sex chromosomes. Fill in the blank(s) with the appropriate word(s).
Tomato plants that have pest-resistance genes inserted into the genome can be called
A) genetically engineered organisms. B) Only the second and third answer choices are correct. C) transgenic organisms. D) cloned organisms. E) All of the above answer choices are correct.