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Wittaler [7]
3 years ago
14

Local farmers think that a commonly used pesticide is responsible for the increase in appearance of frogs with an additional app

endage. To test this hypothesis, frogs are injected with a small amount of pesticide mixed in ethanol. The frogs are allowed to produce offspring to test the effect of the pesticide. Which of the following would be the best controlled experiment? A. One group is injected with ethanol, and one group is injected with pesticide. B. One group is injected with pesticide. C. One group is injected with pesticide, and one group is not injected with anything. D. One group is injected with ethanol, one group is injected with pesticide, and one group is not injected with anything.
Biology
1 answer:
stira [4]3 years ago
4 0

Answer:

D.-

Explanation:

A control group is needed to carry out the experiment, that control group is the one that is not injected with anything.  Ethanol and pesticide need to be injected into separated groups to document whether it is one or the other that is harmful

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Answer:

The possible fate of the cell that it may turn cancerous.

Explanation:

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What is the condition of having gametes of different sizes and shapes? oogamy isogamy anisogamy or monogamy
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What is the function of restriction endonucleases in bacteria?
Scilla [17]

Answer:

This is an incomplete question without the options.

Here are the options to pick from

DY

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Within a six-base DNA recognition sequence, an enzyme that cuts between the 3rd and 4th bases from the 5' end will generate blunt ends.

a)True

b)False

a) True

What is the function of restriction endonucleases in bacteria?

a) They serve no function.

b)They allow bacteria to genetically recombine with other bacteria.

c) They allow bacteria to engineer new DNA fragments.

d)They provide a defense mechanism against infection by viruses.

Our answer is surely D

d)They provide a defense mechanism against infection by viruses.

Explanation:

Restriction enzyme/restriction endonuclease:

Are produced by bacteria for cleaveing DNA at specific sites. Restriction enzymes cleave foreign DNA in the bacterial cell to fight against infecting organisms.

Pls Note:

Restriction enzyme are used by

bacteria to defend against bacterial viruses called bacteriophages or phages

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