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PilotLPTM [1.2K]
3 years ago
11

B-cells and T-cells fight off the threat by producing _______. ............................

Biology
1 answer:
Ludmilka [50]3 years ago
6 0
B-cells fight bacteria and viruses by making Y-shaped proteins called antibodies, which are specific to each pathogen and are able to lock onto the surface of an invading cell and mark it for destruction by other immune cells
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What is a scenario for "artificial selection" in biology?
slega [8]

Answer:

Artificial selection, also called "selective breeding”, is where humans select for desirable traits in agricultural products or animals, rather than leaving the species to evolve and change gradually without human interference, like in natural selection.

Explanation:

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3 years ago
Compare the reactants and products of photosynthesis with reactants and products of cellular respiration
Brut [27]
The reactants of cellular respirationare oxygen and sugar, which are theproducts of photosynthesis. ... When plants are placed in darkness, cellular respiration continues, using ATP to convert sugar into ADP and releasing carbon dioxide. Photosynthesis stops in the absence of light energy.
8 0
4 years ago
1. List and explain the difference between the minimum voltage and maximum voltage achieve in a nerve impulse
algol [13]
The normal membrane potential inside the axon of nerve cells is –70mV, and since this potential can change in nerve cells it is called the resting potential. When a stimulus is applied a brief reversal of the membrane potential, lasting about a millisecond, occurs. This brief reversal is called the action potential 
<span>A stimulus can cause the membrane potential to change a little. The voltage-gated ion channels can detect this change, and when the potential reaches –30mV the sodium channels open for 0.5ms. The causes sodium ions to rush in, making the inside of the cell more positive. This phase is referred to as a depolarisation since the normal voltage polarity (negative inside) is reversed (becomes positive inside). </span>

<span>Repolarisation. At a certain point, the depolarisation of the membrane causes the sodium channels to close. As a result the potassium channels open for 0.5ms, causing potassium ions to rush out, making the inside more negative again. Since this restores the original polarity, it is called repolarisation. As the polarity becomes restored, there is a slight ‘overshoot’ in the movement of potassium ions (called hyperpolarisation). The resting membrane potential is restored by the Na+K+ATPase pump.</span>
8 0
4 years ago
Type the correct answer in the box. Spell all words correctly.
kirza4 [7]

Answer:

Mohammed should now <u>lift</u> the print from the surface to preserve it

Explanation:

In order to preserve fingerprint evidence as required by crime laboratory policies and criminal justice systems, for which we have digital photography, casting material, and latent print lifts, that can be used as secondary evidence

The ridges on the cast and lift can be photographed to serve as an additional secondary evidence

The  processing of the latent print after photographing is dependent on the surface type and may include the creation of an impression on soap, paint, wax, clay or dust

Therefore, Mohammed used an enhancement technique that made a fingerprint visible on a lamp. He photographed the print. Mohammed should now <u>lift</u> the print from the surface to preserve it

8 0
3 years ago
Which type of heterotroph is a mouse?
AVprozaik [17]

Answer:

D

Explanation:

Both mice and rats are omnivores, which means they eat plants and animals, but they tend to enjoy different food items. During times of starvation, a mouse will even eat its own tail!

5 0
3 years ago
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