BIOLOGY HIGH SCHOOL

A student observed a specimen through a light microscope.He used the objective lens marked $* 40$
.if he indiceated the
magnification of the image as
$* 400$
what was the eyepiece magnifacation?

Answers

Answer 1

Answer:

Ans

400=x*40

x=400/40=10

ans = x10

Explanation:

total magnification=eyepiece magnification*objective lens magnification

eye piece=total/objective lens

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Smallpox is a virus that causes a rash that then turns into painful blisters. The last known case of smallpox was in 1977. What is the best explanation for the eradication of smallpox?

Answers

The best explanation for the eradication of small pox is that the disease was eradicated due to a massive global immunization campaign led by the World Health Organization.The last known case was in Somalia in 1977. Since then, the only known cases were caused by a laboratory accident in 1978 in Birmingham, England which unfortunately killed one person. It caused a limited outbreak.After the global immunization program by the World Health Organization, small pox was declared eradicated in 1980.

Answer:

Explanation:

did the test my friend

The sodium-potassium pump in animal cells requires cytoplasmic ATP to pump ions across the plasma membrane. When the proteins of the pump are first synthesized in the rough ER, what side of the ER membrane will the ATP binding site be on?

Answers

Answer:

It will be on the cytoplasmic side of the endoplasmic reticulum

Explanation:

The inner mitochondria protein called Adenine Nucleotide Translocator or ADP/ATP carrier protein, maintains the transport of ADP into the matrix of the mitochondria from the cytoplasm for ADP to be available for ATPase synthesis of ATP, from ADP and Pi(inorganic phosphate ion) during chemiosmosis of oxidative phosphorylation in the mitochondria.

The same carrier proetin also convey the synthesized ATPs back to the Cytoplasm for cellular utilization.

Therefore the ATP binding site should at the cytoplasmic side of the E.R, because the cytoplasm of the E.R is the site of deposits of synthesized ATP s, thus proximity of the ATP-binding site to it is needed.

Ticks carry bacteria that cause Lyme disease. Ticks do not get Lyme disease, but they can transfer the bacteria to humans, who can get the disease. Which of the following statements best describes the relationships among the bacteria, the ticks, and the humans?a. The relationship between the bacteria and the ticks is competition, and the relationship between the ticks and the humans is predation.
b. The relationship between the bacteria and the ticks is competition, and the relationship between the ticks and the humans is parasitism.
c. The relationship between the bacteria and the ticks is commensalism, and the relationship between the ticks and the humans is parasitism.
d. The relationship between the bacteria and the ticks is commensalism, and the relationship between the ticks and the humans is predation.

Answers

The answer is c. The relationship between the bacteria and the ticks is commensalism, and the relationship between the ticks and the humans is parasitism.

Commensalism is a relationship between two organisms in which only one of them has benefit, and the other one is not affected. Bacteria are carried by ticks, so bacteria have a benefit from the relationship. Tick is not affected by bacteria, it does not get Lyme disease. Therefore, the relationship between ticks and bacteria is commensalism.

The relationship between ticks and humans is parasitism. Parasitism is non-mutual relationship between two organisms in which one of them (tick) benefits at the expense of the host organism (human).

Which of the following are characteristics of prokaryotes?single-celled structure
flagella for movement
distinct nucleus
membrane-bound organelles

Answers

The characteristics of prokaryotes include: single-celled structure and they have flagella for movement. Membrane-bound organelles such as mitochondria, chloroplast, nucleus and etc. are absent in prokaryotes. Examples of organisms that are considered as prokaryotes are bacteria and algae.

Final answer:

Prokaryotes are single-celled organisms that use flagella for movement. They do not have a distinct nucleus or membrane-bound organelles, unlike eukaryotes. Their DNA is often circular and not organized in chromosomes.

Explanation:

The characteristics of prokaryotes listed include their being single-celled and their use of flagella for movement. However, prokaryotes don't have a distinct nucleus, rather they have a region known as nucleoid where their DNA is located. Also, they lack membrane-bound organelles. They are simpler in structure compared to eukaryotic cells. Their DNA is often circular and not organized in chromosomes as in eukaryotes.

Learn more about Prokaryotes here:

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In a circuit diagram, a zigzag line drawn inside a circle represent a type of switch true or false

Answers

It is false that in a circuit diagram, a zigzag line drawn inside a circle represent a type of switch. It represents a type of resistor.

The zigzag line is a resistor but the circle indicates that it has some other aspect going on too, such as a temperature or light dependency. Although the symbols for those would usually have other things too, such as small wiggly arrows to indicate light.

In order to stimulate an effector in a toe, which pathway does a nerve impulse follow after it is initiated at a receptor?A. sensory neuron -> interneuron -> motor neuron
B. motor neuron -> interneuron -> sensory neuron
C. interneuron -> sensory neuron -> motor neuron
D. None of these

Answers

Answer:sensory nuerone to internuerone to motor neurones

Explanation:

The sensory nuerone usually receive inputs from the receptors cells in the skin,organs,and other parts of the body.

These receptors send signals as action potential to the spinal cord to the brain.(CNS).

Synapse take place at the synaptic junctions, in the spinal cord with the internuerone.

The latter transmit the action potential to the motor neuron which synapse with the internuerone and transmita signal to the neuromuscular junction where it synapse with the muscels at the toe.

The action potentials causes influx of calcium ions and the relase of acetylcholine neurotransmitters for action potential to reach the toe muscles (effector)for contraction

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