A trend first observed in the evolution of the earliest tetrapods was _____
A) the appearance of jaws
B) feet with digits
C) the mineralization of the endoskeleton
D) the amniotic egg
B
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While studying eukaryotic mRNA processing, you encounter the sequence GUACACACAUGAG in the middle of a long mRNA transcript. Which statement can you make, based on your discovery?
a. This sequence will be replaced by a poly-A tail. b. This transcript will be assembled into a ribosome. c. This transcript has not yet undergone splicing. d. This is a transcript for Asparagine tRNA.
The Human Population growth curve illustrates that
a. humans have reached their carrying capacity. b. humans have exceeded their carrying capacity. c. humans are experiencing exponential growth. d. human population will crash. e. humans do not have a carrying capacity.
Cocaine can potentially cause convulsions because:a
the drug increases the clearance of neurotransmitter from the synaptic cleft. b. the drug decreases the amount of neurotransmitter in the synaptic cleft. c. the drug binds to postsynaptic receptors and stimulates depolarization. d. the drug decreases intracellular calcium levels and therefore blocks release of neurotransmitter. e. blocks the reuptake of neurotransmitters from the synaptic cleft
The assisted transport of a molecule across the cell membrane without an expenditure of energy is known as what?
A. osmosis B. diffusion C. crenation D. facilitated transport E. active transport