What is the function of troponin and tropomyosin during skeletal muscle contraction?
A) To generate an action potential
B) To regulate bonding between actin and myosin
C) To remove calcium from the muscle fiber
D) To increase the amount of calcium entering the muscle fiber
E) To prevent over-contraction of muscle fibers
B
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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.
A retrovirus produces an enzyme, called reverse transcriptase, which copies its RNA genome into DNA. This is opposite of the central dogma because
A) a virus is not an organism. B) a virus lacks genetic material. C) the central dogma states that RNA is copied into DNA. D) the central dogma states that DNA is copied into RNA.
The purpose of regulation of the trp operon in bacteria is to ensure the cell can digest tryptophan if it is present and the cell is short on energy
Indicate whether the statement is true or false
The filtrate removed from the blood by the kidneys might contain
a. salts, amino acids, glucose, and urea b. ammonia, red blood cells, and minerals c. fat, urea, and water d. salts, urea, and plasma