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2 years ago

Which is an example of a Gram-negative bacteria?

Biology

1 answer:

vova2212 [387]2 years ago

8 0

Answer:

Gram-negative bacteria are bacteria that do not retain the crystal violet stain used in the Gram staining method of bacterial differentiation. They are characterized by their cell envelopes, which are composed of a thin peptidoglycan cell wall sandwiched between an inner cytoplasmic cell membrane and a bacterial outer membrane.

Explanation:

Hope this helps! :)

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What do plants use to signal one another and communicate?

Snezhnost [94]

Hormones or chemicals

4 0

4 years ago

Which statement explains why the tetra fish are able to produce a green glow? Bioluminescence is the emission of light by a livi

Alekssandra [29.7K]

Answer:

Scientists have isolated the gene that produces the bioluminescence protein and inserted the gene into the embryos of tetra fish. This results in tetra fish that produce a green glow.

Explanation:

Tetra fish is a type or an example Glofish that has undergone genetic modifications whereby the gene in jelly fish that produces the green fluorescent protein (GFP) was extracted and inserted into the embryos of the tetra fish thereby causing them to glow or fluoresce in the presence of Ultraviolet light or natural light. The genetically modified tetra fish passes this fluorescent gene from one generation to another.

The aim of this genetic modification in tetra fish was to be able to detect water pollution in the sea using the glow of the tetra fish.

5 0

3 years ago

Isovolumetric relaxation and ventricular filling (two phases of the cardiac cycle) take place during __________. Isovolumetric r

Helga [31]

Answer:

Option B, ventricular diastole

Explanation:

Ventricular diastole also termed as ventricular relaxation consists of two phases. In the first phase, the following set of events takes place –

a) Relaxation of ventricle muscles

b) Reduction in pressure of blood within the ventricles

c) As this reduced blood pressure gets lower than that of pressure with in the pulmonary trunk and aorta, blood starts flowing back towards the heart.

d) A small dip in the blood pressure is observed at this stage

e) Volume at this stage remains constant as the atrioventricular valves remain closed

f) This phase is known as isovolumic ventricular relaxation phase

In the second phase, the following set of events takes place –

a) Relaxation of ventricular muscle

b) Dropping of pressure of the blood within the ventricles lower than that of pressure of blood in the atria

c) Blood starts flowing from atria into the ventricles thereby opening the tricuspid and mitral valves

d) Both the heart chambers chambers are in diastole,

e) Atrioventricular valves are open

f) Semilunar valves remain closed

Hence, option B is correct

3 0

3 years ago

When a skeletal muscle contracts, what is happening at the level of the muscle proteins?

Margaret [11]

Bulk flow systems move substances faster than simple diffusion.

6 0

3 years ago

is it bad luck to kill a cricket? because i'm trying to do my work and one is hopping around my room. I don't know who it got in

tatiyna

Native Americans believed crickets brought good luck to them. Therefore, they believed that killing a cricket was very bad luck... even if it was on accidents.

But who knows? Right? It's just a superstition.

6 0

3 years ago