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Rudik [331]
2 years ago
12

5. Why are index fossils useful in dating rock layers?

Biology
1 answer:
mr Goodwill [35]2 years ago
8 0

Answer:

Fossils are used to determine the ages of rock layers.Index fossils are of organisms that lived over a wide area. They lived for a fairly short period of time. An index fossil allows a scientist to determine the age of the rock it is in.

Explanation:

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Post-transcriptional regulation includes all of the following mechanisms EXCEPT:RNA interference - anti-mRNA sequences bind to m
Usimov [2.4K]

Answer:

D) presence of transcription activators or repressors

Explanation:

The reason why this is not post-transcriptional regulation is that activators actually start the process of transcription by binding to specific sites. while on contrary when repressor binds it halt the process.

For example, there is a protein called CAP which in the presence of cAMP bind with promoter region and enhances the activity of RNA polymerase . While in the absence of cAMP it can not bind to promoter hence the transcription stooped.

4 0
3 years ago
Select TWO events that occur when a neurotransmitter binds and activates an excitatory synapse.
andrew-mc [135]

Answer:

Key points

Neurons communicate with one another at junctions called synapses. At a synapse, one neuron sends a message to a target neuron—another cell.

Most synapses are chemical; these synapses communicate using chemical messengers. Other synapses are electrical; in these synapses, ions flow directly between cells.

At a chemical synapse, an action potential triggers the presynaptic neuron to release neurotransmitters. These molecules bind to receptors on the postsynaptic cell and make it more or less likely to fire an action potential.

Explanation:

7 0
2 years ago
What are the characteristics of epithelial tissue?
Mkey [24]
Epithelial, Connective, Muscular, and Nervous
8 0
3 years ago
Find the median for this set of data.<br> 10.2.<br> 6.8<br> 5.4<br> 3.7<br> 9.3
Nat2105 [25]

Answer:

6.8

Explanation:

least to greatest.

3.7 5.4 6.8 9.3 10.2

if there is an even number  in the data set  then the median is found by the mean of the two middle most.

but since it is an odd data set it is 6.8

HOPE THIS HELPS!

3 0
3 years ago
Aldosterone increases the __________ of sodium ions bringing more back into the blood
Assoli18 [71]
Aldosterone increases the reabsorption of sodium ions bringing more back into the blood.
<span>This is the main mineralocorticoid hormone of the adrenal gland. The function of the aldosterone is in the homeostatic regulation of blood pressure, plasma sodium (reabsorption) and potassium levels (excretion).</span>
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3 years ago
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