Analysis of the primary transcript for an insulin receptor protein reveals that exon 11 has been removed from the mRNA in skeletal muscle, but not in liver. How does this affect the proteins synthesized in these two types of cells?
A. Translation of the insulin receptor mRNA is
inhibited in skeletal muscle.
B. Translation of the insulin receptor mRNA is
inhibited in the liver.
C. The mRNA transcript for the insulin
receptor protein will be identical in both the
liver and skeletal muscle and so translation
occurs in both cell types.
D. The insulin receptor in skeletal muscle has
a higher affinity for insulin than the receptor in
the liver.
E. The insulin receptor in the liver has a
higher affinity for insulin than the receptor in
skeletal muscle.
D
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Griffith, a British microbiologist, used bacteria and mice to demonstrate the process of transformation. During transformation,
A. a bacterial chromosome produces an exact copy of itself. B. the nucleus of a mouse cell repairs itself when damaged by bacterial infection. C. DNA from an infected mouse cell changes bacteria from a non-pathogenic to a pathogenic form. D. genetic material is transferred from one bacterial cell to another. E. a bacterial cell is transformed into a spore during unsuitable environmental conditions.
During synaptic transmission across a typical synapse, which action occurs?
A) Sodium ions flow into the membrane of the presynaptic neuron. B) The binding of neurotransmitters triggers the release of potassium ions by the presynaptic neuron. C) Vesicles containing neurotransmitter molecules diffuse to the receiving neuron's plasma membrane. D) Neurotransmitter molecules bind to receptors on the postsynaptic membrane.
The proper order for the scientific process is:
A. experiment - observation - predictions - hypothesis B. predictions - experiment - observation - hypothesis C. observation - hypothesis - predictions - experiment D. hypothesis - observation - experiment - predictions
Protein synthesis occurs on/in the
A. nucleus. B. ribosome. C. inclusion. D. cytoskeleton. E. periplasmic space.