1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Mandarinka [93]
4 years ago
15

A student placed a disk of filter paper in each of the following solutions: disinfectant 1, disinfectant 2, disinfectant 3, and

distilled water. While the four disks were soaking in their respective solutions, she streaked a sterile nutrient agar dish with a culture of E. coli bacteria. Then, she placed each disk carefully onto the nutrient agar dish, placed the lid on the dish, taped it shut, and incubated the dish at 37°C for several days. The diagram shows how the nutrient agar dish looked on Day 1 and Day 4. The shaded portion of the plate on day 4 indicates the bacterial growth. What is the control in the experiment?<br />
a. Disk soaked in disinfectant 1<br />
b. Disk soaked in disinfectant 3<br />
c. Disk soaked in disinfectant 2<br />
d. Disk soaked in distilled water
Biology
1 answer:
andrey2020 [161]4 years ago
7 0
Correct me if i get this wrong but im gonna go  with letter D it just feels right!
You might be interested in
Which type of equipment would be used to precisely measure 26.0 ML of dilute hydrochloric acid
STatiana [176]

Answer:

the answer is c a graduated cylinder is used to measure liquids more efficently

Explanation:

7 0
3 years ago
How is a class system different from a caste system?
lana66690 [7]

Answer:

A class system is a more smooth system, caste is more of a system that changes consistently.

Explanation:

"Class system is typically more fluid than the caste system or the other types of stratification and the boundaries between classes are never clear-cut. Caste system is static whereas the class system is dynamic. ... In the caste system, individual mobility from one caste to another is impossible."

4 0
3 years ago
There are a number of lipids that are found in foods and contribute to various functions in the body. Triglycerides are the most
hodyreva [135]

<u>Answer</u>:

There are a number of lipids that are found in foods and contribute to various functions in the body. Triglycerides are the most common lipid found in food and in the body; they consist of a <u><em>Glycerol</em></u><u> </u>backbone attached to three fatty acids.

Fatty acids are classified based on the degree to which the carbon chain is saturated with <u><em>Hydrogen</em></u>

A fatty acid is <u><em>saturated </em></u>if it contains no carbon-carbon double bonds,   <em><u>polyunsaturated </u></em>if it contains  two or more carbon-carbon double bonds, and<em><u> monounsaturated </u></em>if it has only one carbon-carbon double bond.

The unsaturated fatty acids can exist in one of two structural forms: the <em><u>trans </u></em>form occurs when hydrogens on both carbons forming the double bond lie on opposite sides of that bond.

When hydrogens on an unsaturated fatty acid lie on the same side of the carbon-carbon double bond, a <u><em>cis </em></u>formation exists.

 

4 0
3 years ago
The circulatory system interacts with other body systems. How does the circulatory system help the excretory states and the dige
tatiyna
The circulatory system helps the excretory and digestive system do their jobs because the waste from the blood in the circulatory system is eliminated from the body through the excretory system, and the nutrients absorbed by the digestive system are transported through the blood.
8 0
3 years ago
Which one is it??<br> It’s on usatestprep.
sweet-ann [11.9K]

The other guy is right, B is the answer now hurry and get that test prep done

8 0
3 years ago
Other questions:
  • People who are colored blind most likely have deficiencies in their:
    5·1 answer
  • A biologically based addiction is a condition in which
    13·1 answer
  • The thin external covering is similar to the _______. The organelle with a texture like sandpaper is the _______.1.
    11·1 answer
  • Consider an atom of gold in which the nucleus contains 79 protons and 118 neutrons. What is its atomic number and atomic mass nu
    14·1 answer
  • Which of the following statements is not true?
    9·1 answer
  • *PLEASE HALPPPPPPPPP**PLEASE HELP SUPER URGENT FOR BRAINLIEST* A physical property that depends on the amount of matter in the s
    8·2 answers
  • What is the period of cell life when it is conducting cell division?
    13·2 answers
  • Which of the following polymers functions as insulation to help animals conserve heat
    15·2 answers
  • PLEASE HELP ME EMERGENCY PLEASE HELP!! IF YOU ARE NOT 100% SURE ABOUT YOUR ANSWER DO NOT ANSWER THEN PLEASE!!
    10·2 answers
  • 1. write a sentence that describes how the food changes in the stomach.
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!