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3 years ago

All mutations are harmful. True False

Biology

2 answers:

Shalnov [3]3 years ago

4 0

I think it's false. Not 100 though

denis23 [38]3 years ago

4 0

False, However not all mutations are harmful, there are very few number of mutations that actually can change the codes for a better functioning protein. In this case they will be beneficial. Here we are testing for potentially harmful mutations in human genes.

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Does a prokaryotic cell or a eukaryotic cell seem more simple? Explain our answer.

dedylja [7]

Answer:

prokaryotic

Explanation:

I think that because since it doesn't have a nucleus or as many organelles as eukaryotic. They are smaller in size and don't have membrane bound structures.

6 0

3 years ago

PS: PLEASE DO NOT PUT A LINK IN THE ANSWER SECTION!

Dmitry [639]

Answer:

A Globally

Explanation:

i took the quiz and got it right.

8 0

3 years ago

What is NOT true about energy transformation in living things?

Eduardwww [97]

I say that it is D well i think it's D

5 0

3 years ago

B. Prepare a FLOWCHART for the isolation of the following: (conventional methods only: culture, through a by product and/or immu

yaroslaw [1]

1. Dysentery caused by Shigella dysenteriae is isolated using MacConkey Lactose agar and Xylose Lysine agar

2. Antibiotic associated diarrhea caused by Clostridium difficile (detection of toxin) is isolated using Clostridium difficile selective medium

3. Dermatophyte infection in the nails is isolated using potatoes dextrose agar

4. Dengue fever by immune response is isolated using minimal essential medium (MEM)

1. Dysentery caused by Shigella dysenteriae

Collection of fecal specimens and poultry (100) fecal samples collected from were processed according to published protocols.
Streak one loopful of fecal sample on MacConkey Lactose Agar (MLA) and Xylose Lysine agar

Incubated at 37 C for 24 hours
The MLA plates showing the presence of convex and colorless colonies are considered for further identification.
Similarly, the XLD plates showing appearance of presence of translucent or red colored colonies are taken for further identification.

2. Antibiotic associated diarrhea caused by Clostridium difficile (detection of toxin)

Mix equal parts of industrial absolute alcohol and the fecal specimen.
Homogenize using a vortex mixer.
Leave at room temperature for 1 hr.
Inoculate on Clostridium difficile Selective Agar
Incubate at 37ºC in a conventional anaerobic gas jar
Observe after 24-48 hours in anaerobic environment .
Use gram stain reagent and Malachite green for morphological study.
Observe positive bacillus cell shape with single or chains(2-6)cell and sub terminal endo spore forming after gram staining

3. Dermatophyte infection in the nails

Prepare potatoes dextrose agar (PDA)
Collect clippings from the nail with a sterile scalpel after carefully washing the site with 70% alcohol.
Dissolved in two drops of 10% KOH on a glass slide, if the sample is thick, use 20% KOH
Heat the slide few seconds over a spirit lamp, do not allow to boil.
Observe preparation under a low power of the microscope in reduced light.
Look out for presence of mycelia fragments and the distribution of spores inside.

4. Dengue fever by immune response

Dilute blood samples in minimal essential medium (MEM) containing 2% fetal bovine serum (FBS)
Add diluent to a cultured monolayer of C6/36 cells for 1 hour with gentle rocking in a 28 °C CO2 incubator.
After 1 hour, remove the inoculum and cells
Culture for 7 days in MEM with 2% FBS and antibiotics.
Collect culture supernatant on day 7 and infect a new batch of C6/36 cells
Repeat the procedure three times to achieve passage 3 (P3) isolates.

Learn more about culturing of microorganisms here:

brainly.com/question/17795892

#SPJ1

4 0

2 years ago

The ability to retrieve and reproduce from memory previously encountered material is called recognition.

s344n2d4d5 [400]

It is B. False. Probably I don't know

4 0

4 years ago