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umka2103 [35]
3 years ago
10

Which of the following is a testable scientific question

Biology
2 answers:
katovenus [111]3 years ago
4 0

Answer: Just took the test: Its "How does the age of city affect the number of trees in the city? "

sineoko [7]3 years ago
3 0
Where are the questions so i can answer them?
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1)Which of the following is a source of genetic variation
Svetllana [295]

The answer is; B

Mutations change the order of nucleotide and therefore affects codons that code for proteins. A different protein is thus produced from the wild type hence creating variations.  Genetic shuffling in sexual reproduction, also called gene recombination occurs during meiosis and also when different organisms exchange genetic material such as in bacteria.  

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3 years ago
In a certain population, the allele causing sickle cell anemia has an allele frequency of 0.2. if the population is in genetic e
alexandr1967 [171]
The answer is "0.64".
8 0
3 years ago
If the nucleotide sequence on one side of a DNA molecule is CCTAGCT, then the sequence on the complementary strand of DNA will b
valentinak56 [21]

Answer:GGATCGA

Explanation:

The complementary double helix of the DNA are antipararell to each other.

Chargaff's rule state that Adenine always pairs with thymine (double bond) and Cytosine always pairs with guanine (triple bond).

Therefore if a DNA molecule is CCTAGCT, then the sequence on the complementary strand of DNA will be GGATCGA as written below

5' CCTAGCT 3'

3' GGATCGA 5'

5 0
3 years ago
The placenta develops from the outer cells of the
statuscvo [17]
<span>blastocyst The outer layers of the blastocyst turn in to the trophoblast after implantation. The trophoblast forms the placenta.</span>
4 0
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What is produced by the process of meiosis?. . A.. two diploid cells. . B.. four diploid cells. . C.. two haploid cells. . D.. f
timofeeve [1]
Four haploid cells are produced by the process of meiosis. The correct answer is D. 
4 0
3 years ago
Read 2 more answers
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