When under attack, ciliates can eject dart-like protein threads from surface organelles called ____
a. vacuoles
b. gullets
c. trichocysts
d. phagosomes
e. alveoli
ANSWER: c
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In the Northern Hemisphere, seasonal variation in temperatures is caused mainly by ____
a. the Earth's elliptical orbit taking it closer to and farther away from the sun b. the Earth's tilt on its axis of 23.5
In this type of interaction, one organism is unharmed while the other benefits
a. commensalism b. mutualism c. symbiosis d. predation e. parasitism
Which one of the following is the lowest level of biological organization in which evolutionary change can occur?
A) cell B) organism C) community D) population
What is the correct sequence for the start of an organism's life cycle?
A) fertilization ? meiosis ? zygote ? embryo
B) meiosis ? fertilization ? zygote ? embryo
C) fertilization ? zygote ? meiosis ? embryo
D) meiosis ? fertilization ? embryo ? zygote