The fluid-filled ball of cells produced at the end of cleavage is properly called the:
A. blastula.
B. morula.
C. gastrula.
D. fetus.
E. epiblast.
A
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What is the life history adaptation called where organisms produce offspring several times over many seasons?
A. semelparity B. iteroparity C. biparity D. polyparity E. alloparity
Invasive fungi have caused ecological disasters in the U.S. during the last century. The American chestnut tree commonly grew in forests from Michigan to Louisiana and from Maine to Georgia. In the 1900s Cryphonectria parasitica, an invasive species, commonly known as Chestnut blight, decimated the chestnut tree population leading to one of the worst ecological disasters in U.S. history. It is thought that the invasive fungus was imported from Japan and China. Other invasive fungi have destroyed large numbers of redbay, dogwood, and oak trees. Is human activity to blame for such disasters? What can be done to alleviate this problem?
What will be an ideal response?
In 1964, Nirenberg and Leder used the triplet binding assay to determine specific codon assignments. A complex of which of the following components was trapped in the nitrocellulose filter?
A) sense and antisense strands of DNA B) charged tRNA, RNA triplet, and ribosome C) ribosomes and DNA D) uncharged tRNAs and ribosomes E) free tRNAs
Some lipases are able to cleave the covalent bonds between the glycerol backbone and the attached fatty acid. What final products do you expect to accumulate through the action of the enzyme monoacylglycerol lipase?
(a) phosphoglycerol and free fatty acid (b) sterol and glycerol (c) free phosphate and glycerol (d) glycerol and free fatty acid