The human body's arterial blood pH is tightly maintained around 7.4 by buffering agents that bind hydrogen ions to stop any change in pH. If an acid-base imbalance overcomes the buffer system, the body changes the ventilation rate, or the rate at which gas enters or leaves the lungs. Changing the ventilation rate changes the concentration of CO2 in the blood, which alters the pH of the blood. In this case, pH 7.4 is the:
A. homeostatic challenge.
B. sensor.
C. effector.
D. integrator.
E. set point.
E. set point.
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If 2 spot (S) is dominant to 4 spot (s), give the genotypes for the parents in the following crosses:
(a) 2 spot ? 2 spot yields 2 spot and 4 spot (b) 2 spot ? 4 spot yields only 2 spot (c) 2 spot ? 4 spot yields 2 spot and 4 spot (d) 2 spot ? 2 spot yields only 2 spot (e) 4 spot ? 4 spot yields only 4 spot What will be an ideal response?
The first cells were autotrophs Indicate whether the statement is true or false
Which of the following is not true:
a) The flow of genetic information in a cell is RNA to DNA to Protein. b) A mutation is any change in the nucleotide sequence of DNA. c) Mutations may result from errors in DNA replication. d) Mutations may result from physical or chemical agents called mutagens.
A transfer of genes between non-homologous chromosomes is known as
A. crossing over. B. aneuploidy. C. trisomy. D. translocation. E. duplication.