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Masja [62]
4 years ago
14

Lazzaro Spallanzani and Louis Pateur both performed experiments hoping to disprove the hypothesis that organisms can form by spo

ntaneous generation. Which of the following flask was included in Pasteur's experiment that was NOT included in ssspallanzani's?
A. A flask that allowed air to enter but did not allow microorganisms to enter
B. A flask that did not allowair to enter but did allow microoganisms to enter
C. A flask that allowed neither air to enter nor microorganisms to enter
D. A flask that allowed both air th enter and microorganisms
Biology
2 answers:
zimovet [89]4 years ago
7 0
B. 
hope this helps
'<em>With hugs ~Liesel</em>
Oxana [17]4 years ago
7 0

Answer:

B. A flask that did not allow air to enter but did allow microorganisms to enter

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Which if these is an example of behavioral isolation
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“Two species of crickets, Gryllus rubens and Gryllus texensis, have different courtship songs which can be identified only by the opposite sex of their own species” is an example of behavioral isolation.

 

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The correct answer between all the choices given is the third choice or letter C. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.


3 0
4 years ago
Single strands of nucleic acids are directional, meaning that there are two different ends. What functional groups define the tw
pickupchik [31]

Answer:

The functional groups that define the two different ends of a single strand of nucleic acids are:

B. a free hydroxyl group on the 5' carbon a free hydroxyl group on the 3' carbon

G. a free phosphate group on the 5' carbon

Explanation:

A nucleic acid is a polymer formed of nucleotides that are linked with a phosphodiester bond. The structure of a nucleotide consists on a phosphate group linked to a pentose (ribose in RNA and deoxyribose in DNA) that is also attached to a nitrogenous base. The nitrogenous bases are adenine, guanine, cytosine, thymine (in DNA) and uracil (in RNA).

DNA and RNA are nucleic acids which can be found in a double or single strand presentation.

Nucleic acids are synthesize in the 5’ to 3’ direction, so that is why the convention is that the sequences are written and read in that direction.

The strand of a nucleic acid is directional with an end-to-end orientation, where the 5’ end has a free hydroxyl or phosphate group on the 5' carbon of the terminal pentose, and the 3’ end has a free hydroxyl group on the 3’ carbon on the terminal pentose (ribose/ deoxyribose).

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