Describe the technique of in situ hybridization and its purpose
What will be an ideal response?
Ans: In situ hybridization allows the detection of a specific sequence at a specific location in an intact cell or tissue, such as a specific chromosomal locus. After treatment to denature the target sequence, a probe is hybridized and the probe's label can be detected to indicate the location of the target sequence.
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Which of the following mutations would most likely have the most severe consequence?
A. silent B. missense C. frameshift D. addition of a codon
Scientists want to determine whether chemical X, a component of fertilizer, is harmful to fish. They treat fish in the
laboratory with increasing amounts of the chemical for one week and then measure their viability. When researchers designed this experiment, they wrote "If chemical X is toxic, the fish will begin to look sick and die." This statement is a(n) ____.
a. interpretation b. theory c. hypothesis d. result e. prediction
Which one of the following cellular components is NOT directly involved in synthesis or secretion of
molecules in the cell?
a. ribosomes b. lysosome c. rough endoplasmic reticulum d. Golgi complex e. smooth endoplasmic reticulum
Freshwater sponges reproduce asexually by forming resistant internal buds called
a. spicules. b. larvae. c. ovaries. d. gemmules.