In which group did the amniotic egg first evolve?
a. amphibians
b. birds
c. reptiles
d. mammals
e. frogs
c
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A researcher has mapped the entire genome of an insect. When scanning the sequences she notices highly repetitive sequences, which contain tandem arrays of short sequences. She is most likely looking at which region of the chromosome?
A. centromere B. telomere C. chromatid D. spindle fiber E. centriole
Answer the following statements true (T) or false (F)
1. Glucocorticoids (i.e., cortisol, prednisolone, dexamethasone) have a diverse number of functions. They include glucose mobilization during stress, development of lung tissue, and therapies to reduce inflammation. 2. Metamorphosis in flatfishes and in amphibians is controlled by growth hormone. 3. The nervous system integrates with the endocrine system to control hormone secretion. 4. The placenta develops from the endometrium while the fetus develops from embryonic tissue.
Classically, nature and nurture have been considered as two very separate factors impacting phenotype. Considering
what we have learned of methylation, is this always the case? What will be an ideal response?
All of the following statements are true about the clam's digestion EXCEPT
A. the clam has a single opening for the entry of food and the exit of digestive wastes. B. small food particles are collected on the gills and moved by cilia to the mouth. C. the clam is a filter feeder. D. the clam is a continuous feeder.