The picture represents the results of a tangent screen test.  What are the colored rings called?

Consider the balanced equation: 3AgNO3(aq) + Na3PO4(aq) → Ag3PO4(s) + 3NaNO3(aq) Of the following statements, which one is incorrect?  A) 9 moles of AgNO3will react with 3 moles of Na3PO4. B) 9 moles of AgNO3should react to form 3 moles of Ag3PO4, given sufficient Na3PO4. C) 3 moles of NaNO3should form when 1 mole of Na3PO4reacts with sufficient AgNO3. D)  6 moles of Na3PO4will react with 18 moles of AgNO3. E) 6 moles of Ag3PO4should form when 3 moles of Na3PO4react with sufficient AgNO3. Choose the letter of the correct response.

What color do Gram negative cells appear when observed at 1000x using bright-field microscopy?

In the Gram stain procedure, _____________________ is used in-between steps to rinse off excess material. 

  Consider a reaction where aqueous solutions of Ca(C2H3O2)2 and LiCO3 are mixed What insoluble precipitate is formed? A)  LiC2H3O2 C)  CaC2H3O2 D)  LiCa E)  Ca(CO3)2 F)  None of these choices is correct.   Choose the letter of the correct response.  

Which of the following types of agar is the Kirby-Bauer test performed on?

Antibiotics that stop the bacteria from dividing, but do not kill them, are called bactericidal.

Note: the following code will NOT error. What is printed by the following code? a = np.arange(3)b = np.arange(3.)c = np.array([a, b])masked_sum = c[(c % 2 == 0) & (a == b)].sum()print(masked_sum)

Given the following pandas DataFrame called salaries_df, write one line of code that returns Josh’s average salary over the three years.  The following table represents salaries_df, which shows each person’s salary for a given year.  1998 1999 2000 John 22000 23000 13000 Jack 11000 14000 16000 Josh 19000 22000 26000

During the streak for isolation, the cell density _____________, eventually leading to individual cells being deposited separately on the agar surface.