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2 years ago

Which group contains only prokaryotes?

Biology

2 answers:

Stels [109]2 years ago

8 0

Answer:

For this question, you will answer with the biological Kingdom. The Kingdom(s) that contains only prokaryotes are Eubacteria and Archaebacteria :)

Explanation:

olchik [2.2K]2 years ago

4 0

Answer:

Domains Archaea and Bacteria

Explanation:

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The primary means for transmitting messages between the brain and the rest of the body is the ______.

Nesterboy [21]

Answer:

The primary means for transmitting messages between the brain and the rest of the body is the <u>spinal cord</u>.

Explanation:

The spinal cord is the main pathway of the nervous system. The impulses are transmitted to the brain through bundles of ascending nerve fibers, while the descending fibers transmit impulses in the opposite direction. Signals are transported to and from different parts of the body along the fibers of the pair of spinal nerves, which form intersections with the spinal cord through their dorsal and ventral roots; the sensory and motor fibers converge in the gray matter of the medulla.

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3 years ago

Which kind of organism is found at the end of a food chain?

ad-work [718]

Answer:

A decomposer is found at the end of a food chain.

3 0

2 years ago

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An unknown bacterium produces colorless colonies when inoculated onto an EMB plate. Predict what you would see if you inoculated

marshall27 [118]

The EMB (Eosin Methylene Blue) agar is a selective and differential agar medium. It contains sucrose and lactose as fermentable substrates together with Eosin Y and methylene blue dyes which in combination gives the agar its characteristic color when prepared and serves as a pH indicator as well as an inhibitor of growth of Gram-positive bacteria. Hence, it is primarily used to isolate Gram-negative fecal coliforms while some positive fecal coliforms such as Staphylococci are also able to grow.

These coliforms are of two types:

Lactose or sucrose fermenting coliforms form metallic sheens on the agar as a result of acid production and the response of the indicator to the increased acidity.
Non-lactose/sucrose fermenters are only able to produce acid by protein deamination. Hence they either form colorless or pinkish colonies on the agar

On the other hand, Mannitol salt agar is a selective and differential agar medium that is primarily used to isolate Staphylococcal bacteria. The presence of sodium chloride in the medium makes it a partial or complete inhibitor of other bacteria.

Hence, an unknown bacterium that forms colorless colonies on EMB will either be a non-lactose fermenting, Gram-negative coliform that will hardly grow on Mannitol salt agar, or a Gram-positive fecal Staphylococcus.

Staphylococci bacteria are of two types:

Coagulase-positive will form yellow colonies on the Mannitol salt agar.
Coagulase-negative will form red colonies on the Mannitol salt agar.

More about isolating media can be found here: https://brainly.in/question/7238948

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2 years ago

An ocean layer in which the temperature drops with depth faster than in other layers is called a thermo cline. True or false

lana [24]

Answer:

true

Explanation:

That is the exact definition of thermocline

4 0

2 years ago

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Explain the role of a hypothesis in a scientific investigation.

k0ka [10]

Answer:

A hypothesis is a testable proposition

used to explain scientific phenomena. It

may be based on previous observations

(a sort of educated guess) or it may

simply be a hunch. Most scientific

hypotheses are combinations of

observation and intuition. The important

thing is that the hypothesis be testable.

If the hypothesis is disproved through

testing, then it is discarded and a new

hypothesis is proposed. If the hypothesis

stands up to rigorous testing, then our

faith in the hypothesis is increased.

This system of careful, rigorous, and

unbiased testing of a hypothesis is what

characterizes the scientific method.

Hope it helps!

4 0

2 years ago