BIOLOGY HIGH SCHOOL

Which of the following is an example of an abiotic factor?a. A wind factor
b. A duck
c. A human
d. A bacterium

Answers

Answer 1
Answer: A. A wind factor because its not living

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Place on an enzyme where the substrate attaches

Answers

The active site, the substrate fits like a key in a lock in the active site of the enzyme. After locking into the active site, the substrate gets changed into new products

Millipedes are. a. plant-eaters
b. meat-eaters
c. both plant- and meat-eaters
d. neither plant- nor meat-eaters

Answers

they are plant eaters

Answer:

plant eaters

Explanation:

they eat decaying wood and when decaying leaves

if neurotransmitter x is able to bind to a receptor site of a ligand-gated sodium channel y on a postsynaptic neuron that is capable of becoming desensitized, what is the likely outcome if neurotransmitter x were to remain in the synaptic cleft for a long time (select all that apply)?

Answers

If neurotransmitter x remains in the synaptic cleft for a long time, the following outcomes are possible:

Prolonged depolarization: Continuous binding of the neurotransmitter to the receptor site of the ligand-gated sodium channel can cause prolonged depolarization of the postsynaptic membrane, leading to sustained neuronal signaling.

Desensitization: Prolonged exposure of the receptor site to the neurotransmitter can cause desensitization, where the receptor becomes unresponsive to the neurotransmitter, reducing the strength of the neuronal signal.

Reuptake: The neurotransmitter may be taken back up into the presynaptic neuron through reuptake transporters, reducing the concentration of the neurotransmitter in the synaptic cleft and reducing the strength of the neuronal signal.

Degradation: The neurotransmitter may be degraded by enzymes in the synaptic cleft, reducing the concentration of the neurotransmitter and the strength of the neuronal signal.

To know more about neurotransmitter refer here:

brainly.com/question/28101943

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Which cell structure is correctly paired with its primary function? 1. ribosome–protein synthesis 2. mitochondrion–movement 3. vacuole–cell division 4. nucleus–storage of nutrients

Answers

Answer:

1. Ribosome–protein synthesis

Explanation:

Ribosomes are structures that are floating in cytoplasm and can be found attached to the endoplasmic reticulum. Ribosomes are also called as the protein factory of the cell because their foremost function is the protien synthesis. Proteins are required by the cell for basic cellular functions, cell division and damage repair etc.
1.ribosome why is beacuse the ribiosomes make the proteins for the cells

List two reasons why amphibians must live in moist environment.

Answers

Their skin is thin so they're prone to drying out and they cannot hold moisture in their bodies(Waterproof skin)
They reproduce in the water and they dry out quickly without water

How does your DNA determine whether you develop sickle cell anemia

Answers

sickle cell is a recessive trait.
that means that you have to inherit the gene from both your parents.
eg, if each of your parents has one good copy, and one defective copy of the gene, there will be a 25% chance you'll get 2 copies of the defective gene.
when that happens, before modern medicine, you'd probably die.

however, if you had 1 good copy, and 1 defective copy, then you'd not get malaria.
in a part of the world where most folks get malaria repeatedly, the benefits outweigh the problems.

thalassemia is a related genetic condition that also offers some protection against malaria, however, just as with sickle cell, if you get too much of the gene, your chances for survival are not good.

both cases are interesting results of mutation and natural selection.
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