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Dima020 [189]
3 years ago
5

1. which pair of bacteria can be differentiated by oxidase test?

Biology
1 answer:
fredd [130]3 years ago
6 0

Answer:

1. A. Pseudomonas and E. coli

2. B. Red without black center

3. B. Salmon/orange

Explanation:

Pseudomonas is referred to as an oxidase positive bacteria while E. Coli is an oxidase negative bacteria. The use of the oxidase test will be helpful in the differentiation of the two Bacteria according to their oxidase activity/properties.

Colonies of Red without black center color is what is expected on HE agar if shigellosis is suspected.

Colonies of Salmon/Orange color is what is expected on HE agar if Enterococcus sp. is suspected.

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Brilliant_brown [7]
Huh? I’m confused with this
8 0
4 years ago
The half-life of silicon-32 is 710 years. If 70 grams is present now, how much will be present in 200 years? (Round your answer
elena-s [515]

Answer:

57.7 grams

Explanation:

Given -

Half life of the silicon-32 = 710 years

Half life means the time period required by a radioactive element to reduce its mass by half.

Radioactive decay formula is

A = A_o*2^{\frac{-t}{h} }

Where

A represents the amount of radioactive element after time t years

A_0 represents the initial amount of radioactive element

t = time of decay

h = half-life of the substance

Substituting the given values in above equation, we get -

A = 70 * 2^{\frac{200}{710} \\

A = 57.7 grams

6 0
4 years ago
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Fofino [41]
I’m pretty sure the answer is plants, sorry if it’s wrong!
7 0
3 years ago
Question 2 (5 points)
DENIUS [597]

Answer:

west to east

Explanation:

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3 years ago
Which biome has stems for water storage, extensive root system for absorbing water, and modified leaves (spines)?
shusha [124]
<span>The correct answer is desert biome.</span>
Deserts are regions also called drylands because of the conditions found there (like a moisture deficit). Desert plants have to adapt to those dry and hot climates (sometimes without fresh water for years). Some plants have adapted by growing long roots that tap water from deep underground. Others, such as cacti, have special means of storing and conserving water (modifications of leaves for example).
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