A farmer wants to improve crop yield in his fields by testing the effectiveness of a new pesticide available on the market. Which one of the following is the best control for this experiment?
A) a higher concentration of new pesticide used on the control field than the experimental field
B) more shade on the control field than on the experimental field
C) a lower concentration of new pesticide used on the control field than on the experimental field
D) more water on the control field than on the experimental field
E) no new pesticide used on the control field; new pesticide used only on the experimental field
E
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From the relative positions of genes on the
chromosome illustration below, we expect a. the highest frequency of crossing over between genes A and D. b. more crossing over between C and D than between A and B. c. more crossing over between A and B than between B and C. d. the lowest frequency of crossing over between B and C. e. none of these.
Thread-like pseudopods that can perform phagocytosis are generally characteristic of which group?
A) cercozoans B) gymnamoebas C) entamoebas D) amoeboid stage of cellular slime molds E) oomycetes
If a viral host cell has a mutation that interferes with the addition of carbohydrates to proteins in the Golgi, which of the following could likely result?
A) The viral envelope proteins would not be glycosylated and might not arrive at the host plasma membrane. B) The viral capsid proteins would not be glycosylated and might not arrive at the host plasma membrane. C) The viral core proteins would not be glycosylated and might not arrive at the host plasma membrane. D) The virus would be unable to reproduce within the host cell.
Penicillin and streptomycin are commonly used in synergism because they display the same mode of action
Indicate whether the statement is true or false