Most Gram-negative bacterial cells exhibit which of the following characteristics?
A) Thick layer of peptidoglycan without teichoic acids and large periplasmic space
B) Thick layer of peptidoglycan with teichoic acids and small periplasmic space
C) Thin layer of peptidoglycan without teichoic acids, large periplasmic space, and outer membrane
Ans: C) Thin layer of peptidoglycan without teichoic acids, large periplasmic space, and outer membrane
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One portion of the cell theory states that ____
a. all cells have a nucleus b. all cells divide by meiosis c. all living organisms are made up of one or more cells d. cells arise through spontaneous generation e. growth is solely the result of cell division
Which panel of the figure contains the
recombinant DNA plasmids that will be incorporated into a host cell? a. A b. B c. C d. D e. none of these
Nondisjunction of the XY pair during the first meiotic division can produce sperm with 2 X
chromosomes and 2 Y chromosomes. _________________ Indicate whether the statement is true or false.
Griffith's experiments with S. pneumoniae were significant because they showed that traits could be transferred from one organism to another. What else did he find that was significant?
a) The transferred traits were heritable b) DNA was the genetic material c) A virus made the bacteria pathogenic d) Protein could not be the genetic material e) Heat kills bacteria