While sampling marine plankton in a lab, a student encounters large numbers of fertilized eggs. The student rears some of the eggs in the laboratory for further study and finds that the blastopore becomes the mouth
The embryo develops into a trochophore larva and eventually has a true coelom. These eggs probably belonged to a(n) _____. A) echinoderm
B) mollusc
C) nematode
D) arthropod
B
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What is the most likely explanation of how 14 genes for globins, each specialized in their function (i.e., hemoglobin, myoglobin), arose in the genome of animals?
A. misaligned crossover B. gene deletion C. gene mutation D. misaligned crossover and gene mutation E. misaligned crossover and gene deletion
Receptor adaptation occurs when a sensory neuron stops sending impulses even though the original stimulus is still present. Provide several examples of receptors that adapt readily and others that adapt very slowly, if at all
Explain the survival advantage in each of these situations.
Which protist group is characterized by having a micronucleus and a macronucleus?
a. ciliates b. euglenoids c. actinopods d. diplomonads e. amoebozoans
Movement of molecules from an area of high to low concentration with the help of membrane proteins is:
A. simple diffusion B. signal transduction C. facilitated diffusion D. group translocation