What is a trace element?
A) An element that is very rare
B) An element that is evenly distributed on the planet
C) An element that is required in miniscule amounts for life
D) An element that is used to identify the location of other elements
C
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Why do some animal viruses have an external envelope, while bacteriophages never do?
A. When animal cells are lysed, part of the plasma membrane attaches to the virus; in bacterial cells, it is covered by the cell wall. B. Some animal viruses bud out, taking part of the plasma membrane with them, whereas phages always lyse the host bacterial cell when they exit. C. When phages bud out of the host bacterial cell, they take with them part of the cell wall which forms the capsid, not an envelope. D. When bacteriophages bud out, the plasma membrane is beneath the cell wall and therefore cannot be removed.
Which location in the cell is unlikely to contain ribosomes or ribosomal subunits?
A) nuclear envelope B) plasma membrane C) endoplasmic reticulum D) cytoplasm
Which of the following is a marsupial mammal?
a. echidna b. hydrax c. Tasmanian devil d. manatee
HIV has an RNA genome that is converted to DNA when infecting a human immune cell. This type of virus is called a ________.
A. retrovirus B. bacteriophage C. reverse transcriptase D. prion