Four of the five terms applied to chromosomes
belong together. Select the exception.
a. inversion
b. polyploidy
c. deletion
d. duplication
e. translocation
Answer: b
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You isolate a purify a bacteriophage that can replicate in E. coli. Through chemical analyses you determine that the only nucleic acid present is RNA
You isolate the RNA and put it in a test tube with all of the necessary proteins and RNAs for translation. The RNA is translated and new infectious virions are made. What does this tell you about the bacteriophage? A) The RNA genome is of the plus sense. B) The RNA genome is of the plus sense and RNA replicase is present in the viral capsid. C) The new bacteriophage is a retrovirus. D) RNA replicase is present in the viral capsid.
It appears that eukaryotic diversity took off around 800 million years ago. Which of the following is thought to be responsible for this?
A. By 800 million years ago, enough time had passed since the arrival of eukaryotes for evolutionary adaptation to take place. B. Eukaryotic organisms first arrived 800 million years ago, so when they did, they quickly diversified. C. Chloroplasts first arrived 800 million years ago. D. Environmental conditions changed 800 million years ago, namely an increase in oxygen and a decrease in sulfide. E. All of the answer options are correct.
A property of T cells, but not B cells, is their __________.
A) development from stem cells in the bone marrow B) recognition of specific antigens C) ability to differentiate into memory cells D) ability to form cells that directly kill virus-infected host cells E) ability to undergo clonal selection
Which option would be the LEAST effective initial line of defense against pathogens?
A. Lysosomes in the fluid bathing the eye B. Thick mucus coating the trachea C. Thin, unkeratinized skin of a salamander D. Exoskeleton of a beetle E. Strong stomach acid