If an amphibian zygote is manipulated so that the first cleavage plane fails to divide the gray crescent, then _____
A) the daughter cell with the entire gray crescent will die
B) both daughter cells will develop normally, because amphibians are totipotent at this stage
C) only the daughter cell with the gray crescent will develop normally
D) both daughter cells will develop abnormally
C
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Which of the following would occur from a mutation in the gene's promoter region?
A. The sequence of the mature mRNA would change. B. The ability of pre-mRNA to be properly spliced would change. C. The ability of mRNA to be translationally regulated would change. D. The amino acid sequence of the translated protein would be altered. E. The rate of transcription may increase or decrease.
In a prokaryotic cell, the DNA can be found where?
a. nucleoid b. nuclear membrane c. nucleus d. chromatin
The loops of Henle in the kidneys of a desert kangaroo rat are much longer than those in a white laboratory rat because the __________.
a. kangaroo rat is adapted to living in an environment where water is scarce b. white rat's diet is much less varied than the kangaroo rat's diet c. kangaroo rat cannot always find food d. kangaroo rat produces more body wastes e. kangaroo rat has less stress and lower blood pressure
The first documented human disease to be eradicated was smallpox
Indicate whether the statement is true or false