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makkiz [27]
3 years ago
8

Why did abiogenesis only happen once?

Biology
1 answer:
Sphinxa [80]3 years ago
6 0
Abiogenesis is the theory that life arose from non living molecules to form the earliest life forms. In the simplest sense, once there is life, life will arise from living rather than non living matter. However, there are those who speculate that it is possible for abiogenesis to occur more than once.
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On-center cells: A. are excited by light that falls in the periphery of their receptive field. B. are excited by light that fall
Elena L [17]

Answer: B) are excited by light that falls in the center of their receptive field.

Explanation:

There are two types of bipolar cells present in the retina which are differentiated on the way the centres of their receptive fields respond to light. The names of bipolar cells are ON-centre and OFF-centre.

If a light fall at the centre of the receptive field of a bipolar cell, it will experience an exciting effect on that cell, resulting in it being depolarized, it is an ON-center cell.

Hence, the correct option is B.

6 0
3 years ago
What should you do if possible before updating the uefi firmware?
olya-2409 [2.1K]
UEFI stands for the Unified Extensible Firmware Interface. It <span>is a specification for a software program that connects a computer's firmware to its operating system (OS). </span>
Before updating the UEFI firmware if possible you should backup existing UEFI settings, and connect computer to an U-Power Supply.
4 0
3 years ago
Which is an example of an insertion mutation that changes all of the amino acids that follow the mutation?
astra-53 [7]

Answer:


2) CAG - TTC - ACG mutates to CAG - TTC - ACC - ACG

Explanation:

Insertions are mutations in which extra base pairs are inserted into a new place in the DNA. The number of base pairs inserted can range from one to thousands!

In option no. 1: We see that there is not addition of a single or more than one base, but the new base sequence is different from the original sequence at three places i.e: TTA - CAC - G

In option no. 2: The insertion of three bases ACC has been made exactly after TTC, the whole sequence and arrangement of bases remain same except this insertion.


In option no. 3: The first base of the sequence T is replaced with A, and all other sequence is same. This type of mutation is called substitution in which one base is replaced by other.


In option no. 4: The last base of the sequence C is deleted, and is not present in new sequence. This type of mutation is called deletion in which a base is removed from the sequence.


Conclusion: Therefore, the best option is 2, in which whole codon is inserted in the DNA base sequence.



7 0
3 years ago
Read 2 more answers
In the past, an irregular heart rhythm was treated by using a drug to help regulate the beat. There is a treatment that can also
scZoUnD [109]

Answer:

I believe this is a pacemaker. It controls the heart when it starts to fail.

Explanation:

8 0
3 years ago
Which of the following severe weather events is NOT likely to result in flooding?
Lelu [443]
Hurricane, typhoon,
6 0
3 years ago
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