The all-or-nothing rule of action potential production is a function of ____
a. threshold potential
b. graded potential
c. conduction velocity
d. propagation direction
e. frequency coding
ANSWER: a
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A single mutation causes sickle-cell disease. Which of the following statements best describes how this occurs?
A. The removal of several nucleotides cause the start codon to shift down several places. This causes RNA polymerase to bind in the incorrect spot so that several amino acids are left out of the polypeptide chain during translation. This results in a hemoglobin protein that is incorrectly formed, resulting in sickle-shaped red blood cells that cannot function as intended. B. A single nucleotide mutation causes a normal glutamine amino acid to be replaced with a valine amino acid. This causes the resulting hemoglobin protein to form incorrectly, resulting in sickle-shaped red blood cells that cannot function as intended. C. Three nucleotide mutations cause normal glutamine amino acids to be replaced with valine amino acids. This causes excess hemoglobin proteins to be synthesized, causing red blood cells to swell to the point of bursting, resulting in burst cells that have a sickle-shape. D. The addition of several nucleotides cause the start codon to shift down several places. This causes RNA polymerase to bind in the incorrect spot so that several extra amino acids are included in the polypeptide chain during translation. This results in a hemoglobin protein that is incorrectly formed, resulting in sickle-shaped red blood cells that cannot function as intended.
With respect to a gene with two alleles, for each generation of complete inbreeding the proportion of heterozygotes is expected to be reduced by while the proportion of each homozygous class is expected to increase in frequency by
Explain why this is so.
What is the basic unit of life and the building block of tissues and organs?
a) atom b) organelle c) cell d) dna
Enzymes increase the rate of a reaction by increasing molecular motion, thereby providing kinetic energy to drive the reaction.
Answer the following statement true (T) or false (F)