Biology, 12.10.2019 06:10 mariahv105

Astudent 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?
a. disk soaked in disinfectant 1
b. disk soaked in disinfectant 3
c. disk soaked in disinfectant 2
d. disk soaked in distilled water

Answers: 2

Show answers

Another question on Biology

Biology, 21.06.2019 16:00

Glutamic acid: hydrophilic or hydrophobic? positive, negative, or neutral? valine: hydrophilic or hydrophobic? positive, negative, or neutral?

Answers: 1

Answer

Biology, 22.06.2019 01:30

Which is an advantage of having memory cells when a pathogen is encountered for a second time. a) the memory cells are what proliferate into clones of cells in response to the binding of an antigen. b) memory cells are vital to the primary immune response in that they immediately recognize pathogens even at the first encounter. c) memory cells are essentially effector cells that are short lived and attack antigens even without having a receptor specific to that antigen. d) it ensures that more lymphocytes with a receptor specific to a particular antigen will be present than in a host that had never encountered that pathogen.

Answers: 1

Answer

Biology, 22.06.2019 05:30

Amniocentesis is a process in which amniotic fluid is taken from the mother's womb to identify any genetic abnormalities in the fetus. how would the discovery of the human genome contribute to this process?

Answers: 1

Answer

Biology, 22.06.2019 08:40

What best explains whether bromine (br) or neon (ne) is more likely to form a covalent bond? bromine forms covalent bonds because it has seven valence electrons, but neon has eight valence electrons and already fulfills the octet rule. bromine forms covalent bonds because it has many electron shells, but neon has only two electron shells and is tightly bound to its electrons. neon forms covalent bonds because it can share its valence electrons, but bromine has seven valence electrons and can gain only one more electron. neon forms covalent bonds because it has only two electron shells, but bromine has many electron shells and will lose electrons in order to fulfill the octet rule.

Answers: 3

Answer

You know the right answer?

Astudent placed a disk of filter paper in each of the following solutions: disinfectant 1, disinfec...

Questions