Most phyla of aquatic invertebrates have improved the rate of gas exchange by creating a water current over their respiratory surfaces, thereby ________.
A. changing the diffusion constant
B. increasing the concentration difference
C. increasing the surface area for diffusion
D. decreasing the distance for diffusion
Answer: B
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In signal transduction, phosphatases _____
A) move the phosphate group of the transduction pathway to the next molecule of a series B) prevent a protein kinase from being reused when there is another extracellular signal C) amplify the transduction signal so it affects multiple transducers D) amplify the second messengers such as cAMP E) inactivate protein kinases and turn off the signal transduction
If a male cat with orange fur produces female offspring with calico fur, what color was the mother cat?
A. orange B. black C. calico D. black or calico E. orange or calico
Segmentation is the subdivision of the body into segments or metameres. True segmentation is found in which of the following phyla?
A. Annelida, Mollusca, Arthropoda B. Echinodermata, Platyhelminthes, Cnidaria C. Mollusca, Chordata, Annelida D. Arthropoda, Chordata, Porifera E. Arthropoda, Annelida, Chordata
The full set of genetic instructions of an organism is its (phenotype/genome/genotype).
Fill in the blank(s) with the appropriate word(s).