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Nataliya [291]
2 years ago
10

In 1668, Francesco Redi performed a series of experiments on spontaneous generation. He began by putting similar pieces of meat

into eight identical jars. Four jars were left open to the air, and four were sealed. He then did the same experiment with one variation: Instead of sealing four of the jars completely, he covered them with gauze (the gauze excluded the flies while allowing the meat to be exposed to air). In both experiments, he monitored the jars and recorded whether or not maggots (young flies) appeared in the meat.
Biology
1 answer:
Tcecarenko [31]2 years ago
7 0

Answer:

I need more info? Is this a question or a true or false thing?

Explanation:

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19. Speed humps and speed tables are effective speed reduction measures because ___________ A. they allow traffic to proceed at
charle [14.2K]
The correct answer is "they allow traffic to proceed at the speed limit".

First of all, letter B is incorrect as the main function of the speed humps is not to bring harm to the motorists but to ensure the safety of the flow of the traffic. Letter A is correct as speed humps makes the motorists slow down on purpose for the traffic to proceed at a certain speed limit.
7 0
2 years ago
Read 2 more answers
George on one pair of his chromosomes has STRs of lengths 6 and 7, Stephen (his father) STRs of lengths 3 and 6, and Mary (his m
JulijaS [17]

Answer:

Stephen is not his biological father.

Explanation:

DNA fingerprinting is a technique use to determine the DNA sequence of an individual organism. Short tandem repeats are unique among the individuals ans used to identify the individual in population.

The George DNA fingerprinting shows that he has STRs length of 6 and 7. Stephen's STRs does not match with his son George whereas Mary shows some similarities with George STRs. This indicates that Stephen is not the biological father of George because the biological father's STRs must match with the children STRs.

Thus, the correct answer is option (a).

4 0
2 years ago
please help :) good morning :) For which of these questions could a testable hypothesis be developed? Check all that apply. Do c
Olin [163]

Answer:

peace be upon you dear

Explanation:

The sinus node signals the heart to speed up during exercise or in situations that are stressful, frightening or exciting. For example, a 10- to 15-minute brisk walk typically elevates the heart rate to 110 to 120 beats per minute

8 0
2 years ago
If a dog has 72 chromosomes, how many daughter cells will be created during the single cell cycle? Each of these daughter cells
PIT_PIT [208]

1. Two daughter cells will be produced. The cell division process known as mitosis (single cell cycle) always produces two identical daughter cells, irrespective of the number of chromosomes.

2. 72 chromosomes. As stated above, the daughter cells are identical to the parent cells and have the same amount of chromosomes.

4 0
2 years ago
6. Delete any base (between the READING FRAME, excluding the start and stop codons) and show the change in the amino acid sequen
kati45 [8]
This is the DNA. I'm going to only use the upper strand to demonstrate what this strand would code for before and after a single bp deletion (so write it as mRNA). I will also write it how it's easier to see this which is to split them up into the 3 base codon system. Note that you don't need to know the amino acid code - you use a table to find these.

ORIGINAL (mRNA on top, Amino Acid (AA) on bottom:

5'-AGC GGG AUG AGC GCA UGU GGC GCA UAA CUG-3'
    SER  GLY  MET SER ALA  CYS GLY ALA  STOP LEU 

Note that the protein would stop being made at the stop codon and the LEU wouldn't matter at the end...

Now, I will remove one bp...(I bolded it up top). Rewrite the mRNA and find the corresponding AA...

NEW
5'-AGC GGG AUG GCG CAU GTG GCG CAU AAC UG-3'
   SER  GLY  MET  ALA  HIS   VAL  ALA   HIS  ASN .....

Completely different amino acid sequence after the methionine (MET). The stop codon is gone...the protein would continue being translated until it reaches another stop codon...so not what was supposed to be made! 
5 0
2 years ago
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