How was the navigation ability of young loggerhead sea turtles studied by Kenneth Lohmann?
a. He placed radio transmitters on the shells of numerous hatchlings and tracked their
migration patterns in the Atlantic ocean.
b. He genetically engineered turtles so they lacked magnetoreceptors and then studied their
behavior compared to a control group.
c. He subjected turtles to an electromagnetic field opposite that of Earth's magnetic field, and
then tracked the direction the hatchlings swam.
d. The loggerhead turtles were injected with magnetite to see what impact it had on their
navigation.
e. Small magnets were glued to the hatchlings' shells, and their behaviors were monitored.
C
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Which of the following is correct with regard to adult and embryonic stem cells?
a. Only embryonic stem cells are undifferentiated. b. Both undergo mitosis and differentiation. c. Both can differentiate into any type of cell to replace old and worn-out cells. d. Adult stem cells can only develop into a limited number of cell types.
Which one of the following is formed by the removal of a carbon (as CO2 ) from a molecule of pyruvate?
A) glyceraldehyde 3-phosphate B) oxaloacetate C) acetyl CoA D) citrate
Membrane proteins that help move molecules across the plasma membrane are _______ proteins.
a) channel b) enzyme c) cytoskeleton d) cell recognition
Heart muscle works hard and therefore consumes much ATP. Which organelles would you expect to be especially numerous in the heart muscle cells?
A) lysosomes B) mitochondria C) nuclei D) Golgi complexes