If Mendel crossed two homozygous recessive green peas (yy) together, what percentage of offspring would also be homozygous recessive?
a. 0%
b. 50%
c. 75%
d. 100%
d. 100%
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The lowest concentration of an antibiotic that prevents growth is the
A. 50% inhibitory dose. B. minimal inhibitory concentration (MIC). C. minimal lethal concentration (MLC). D. All of the choices are correct.
Match the following items with the correct phrases.
_______1. The end product of ____________________ is a messenger RNA molecule. _______2. Combining two monosaccharides to form a disaccharide is an example of ____________________. _______3. James Watson and Francis Crick were the first to publish an article describing ____________________. _______4. The end product of ____________________ is a protein. _______5. Breaking the bond in a disaccharide to produce two monosaccharides is an example of ____________________. a. a dehydration synthesis reaction b. DNA replication c. a hydrolysis reaction d. transcription e. translation
The molecular explanation for narcolepsy is that
A) certain brain cells have many extra orexin/hypocretin receptors, so these cells receive too many messages to sleep. B) the orexin/hypocretin receptor does not reach the cell surfaces of certain brain cells. C) a gene is missing in chromosome 6 that encodes the protein narcoleptin. D) a viral infection activates genes that promote sleep.
In describing the initiation and transmission of action potentials in neurons, it would be INCORRECT to say that
A. a stimulus to the neuron can either depolarize or hyperpolarize the neuronal membrane. B. the resting potential is maintained by differential ion permeabilities and the sodium-potassium pump. C. the rate of transmission of an action potential is directly related to the diameter of the axon. D. information about the intensity of a stimulus is conveyed by changes in the size of the action potential generated.