Which of the following statements about probes used in hybridization methods are true?
A. The probe could be a gene from another species.
B. They are usually radiolabelled or conjugated with a fluorescent tag so they can be visualized.
C. They can be synthetic DNA sequences based on known amino acid sequences.
D. They can be based on DNA sequence information from a sequence database.
E. All of these statements about hybridization probes are true.
E
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The geneticist Theodosis Dobzhansky famously wrote that "nothing makes sense in biology except in the light of _________".
Fill in the blank(s) with correct word
Streptococcus pneumoniae is a bacterium that has long been recognized as a major pathogen
causing pneumonia. Based on its name, how might it look under a microscope?
a. Because it is a bacterium, it will be very small and difficult to distinguish. b. It would look like a chain of round beads or balls. c. It would be about the size of a eukaryotic cell. d. both (b) and (c)
During the remodeling process, which cells break down the bone matrix?
a. osteoblasts b. osteocytes c. glial cells d. osteoclasts e. chondrocytes
During an acrosome reaction, the acrosome:a
detaches, allowing the sperm to penetrate the egg. b. releases enzymes that digest the outer layer of the egg. c. secretes calcium ions, which cause the sperm to fuse with the egg. d. releases bindin, which causes the sperm to bind to the egg. e. secretes a chemical that attracts the egg to the sperm.