Which position in a codon is most likely to contribute to the degeneracy of the genetic code?
a. first
b. second
c. third
d. any position
e. no position
C
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Which of the following is a type of epithelial
tissue that is several layers thick?
a. stratified b. loose connective c. dense connective d. simple e. more than one of these
The negative pressure gradient that contributes to the respiratory cycle ____
a. occurs only during expiration b. exists in the pleural cavity c. means that the inside of the lungs has a greater pressure than the pleural sac d. keeps the lungs separated from the chest wall e. is known as a pneumothorax
What is calmodulin, and what role does it play in signal transduction? What will be an ideal response?
Figure 18.1
In comparing a fairly conserved gene in humans, mice, lizards, and tuna, what can you say about their DNA sequences for the gene based on the cladogram provided?
A. The mouse and lizard would have more similar DNA sequences than the mouse and human. B. The human and lizard would have more similar DNA sequences than the human and mouse. C. The mouse and human would share more DNA sequences than the mouse and tuna. D. The tuna and lizard would share more DNA sequences than the human and lizard. E. The tuna and lizard would share less DNA sequences than the human and mouse.