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kirill115 [55]
3 years ago
7

Compare and contrast the structure of DNA with RNA.

Biology
1 answer:
Anni [7]3 years ago
6 0
DNA is a double-stranded molecule, while RNA is a single-stranded molecule. DNA is stable under alkaline conditions, while RNA is not stable. ... DNA and RNA base pairing is slightly different since DNA uses the bases adenine, thymine, cytosine, and guanine; RNA uses adenine, uracil, cytosine, and guanine.
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Pancreatic cells, which secrete a large amount of digestive enzymes, are labeled with radioactive leucine and then chased for se
LiRa [457]

Answer:

Option-C

Explanation:

A pulse-chase experiment which is used to study the cellular process taking place in the cells. This uses the labelled molecule which is incorporated into the cellular pathway and then the unlabeled molecules are used over time to determine how much time is required by the unlabeled molecule to replace the labelled molecule.

In the given question, the pancreatic cell which secretes the digestive enzyme known as the acinar cell is labelled with the leucine and then used unlabeled leucine.

When observed after three hours, the black spots will appear on the exterior of the cell as the protein has been synthesised by the ER and now has been secreted from the cell.

Thus, Option-C is the correct answer.

5 0
3 years ago
50 POINTS
lapo4ka [179]

City-state government was often conquered because they did not have enough resources to protect themselves

Explanation:

A city-state government is an independent autonomic political system which usually compromises just a single independent city which is governed by itself with sovereignty over its territory. The city-states like Greece, Italy, and Rome etc became very powerful.

The main reason for these city-states being conquered more was the accumulation of wealth and aristocracy in such states.

Heavy taxes, religion, slavery also lead to social unrest and conflicts among these city-states which made them weaker.  These internal conflicts also made them lose their resources and vulnerable to be conquered by other powerful empires.

With the increasing power of neighboring states, like in the case of Rome and Greece, the Romans became mightier than Greeks at one point and conquered the Greek city-states.

6 0
3 years ago
2 Points
SVEN [57.7K]

Answer:

B, A fossil found in rocks from one time period

Explanation:

Fossils are used to determine the ages of rock layers. Index fossils are the most useful for this. 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. Hope that this helps you :)

3 0
3 years ago
ANSWER AND EXPLAIN PLZ:)
Rudik [331]

Answer:

The independent variable in the experiment is A. the jar covers.

Explanation:

The independent variable in an experiment represents the thing that the person conducting the experiment changes or alters.  One group in the experiment had covers (this represents the experimental group) and the other group had no cover (this represents the control group which was not exposed  to the independent variable).  Since the only thing that Redi changed between the two groups was whether or not the jars were covered, this represents the independent variable.

The number of jars and the contents of the jars were constant in both experiments, and the number of maggots on the meat is the dependent variable (the result of changing the independent variable).

Hope this helps!

5 0
3 years ago
How is biomagnification related to pesticides?
malfutka [58]
<span>"One of the most common ways to control or eliminate pests is to use poisons that kill pests - pesticides." 
i prefer you check out this site, believe it or not i hate reading but this isnt that long and the answer is right in front of you!
https://www.slideshare.net/OhMiss/pesticides-and-biomagnification
</span>
7 0
3 years ago
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