The number of allele pairs that assort independently in an organism is generally much higher than the number of chromosome pairs. This phenomenon is due to
A. chromosome inactivation.
B. independent assortment.
C. crossing over.
D. sex-linkage.
E. segregation.
Answer: C
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A cell infected by viruses may die due to the actions of interferons. The same result would occur WITHOUT interferon-any cell infected by a virus would die directly from the virus
Is there any apparent benefit to the host organism from the interferon action? A. No-interferon is just an evolutionary leftover from a much earlier form of antiviral activity. It has no function now. B. Yes-when the interferon acts on a virally infected cell, it shuts down protein production (which shuts down virus replication). Without interferon, virus will kill the cell eventually, but only after it has replicated many times over. Interferons may kill the host cell, but they will also prevent it from being used to replicate virus. C. Yes-by killing host cells, you limit the number of cells that are available targets for viral infection. This is a good way of preventing viral infection. D. No-viruses will replicate in cells regardless of the effects of interferons, so their action of killing the cell has no benefit to the host organism during the infection process.
Each tRNA has an __________ that base-pairs with a
codon, and each binds to the kind of amino acid specified by the codon. Fill in the blank(s) with the appropriate word(s).
Which feature of life is the ability to maintain a stable internal state?
a. energy production b. sensing the outside world c. reproduction d. homeostasis e. growth
A theory is a hypothesis that has been tested many times and continues to be supported
Indicate whether the statement is true or false