The transfer of genes during bacterial conjugation involves rigid, tubular appendages called ________.
A. periplasmic flagella (axial filaments)
B. sex pili
C. fimbriae
D. cilia
E. flagella
Answer: B
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From personal experience, you may have noticed that cut flowers placed in a vase with tap water continue to be "alive" for several days. What is the most likely explanation as to why these cut flowers don't immediately wither and die?
A. The tap water in the vase is an excellent source of nitrogen. B. The plant can still take up water from the vase via an "evaporative pump." C. Cells in the flower petals continue to carry out photosynthesis. D. Cavitation allows for water to still be transported through the flower stems.
Which of the following best explains the figure?
A) Conspicuous behavior leads to high infection intensity. B) High intensity infection leads to more conspicuous behavior. C) There is no relationship between conspicuous behavior and infection intensity. D) Only infected individuals exhibit conspicuous behavior.
The largest prokaryote is ________
Fill in the blank(s) with correct word
In the procedure known as gel electrophoresis, DNA fragments are separated by their:
a. color b. size c. GC content d. pH tolerance