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Alex_Xolod [135]
3 years ago
10

A control variable is: A. Measured to show the effect of a change. B. Collected to draw conclusions. C. Changed to test a hypoth

esis. D. Kept the same to make an experiment a fair test.
Biology
1 answer:
Sunny_sXe [5.5K]3 years ago
5 0
D. Kept the same to make an experiment a fair test.


‘a controlled variable’
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Fill in the blanks with the answer that correctly completes the sentence below.
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C. Amoebae and paramecia is the answer.

Explanation:

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The first cells to initiate an electrical signal in the heart is the
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Answer:

Answer is Sinoatrial node, SA.

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The sinoatrial node, SA, is known to be a group of cells which are found at the top of the heart.

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It should be noted that, the sinoatrial node are regarded as the pacemaker cells.

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3 years ago
Although energy travels through waves, __________________ does not.
Likurg_2 [28]

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Mechanical waves!

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6 0
2 years ago
Read 2 more answers
How many possible open reading frames (frames without stop codons) are there that extend through the following sequence? 5'... C
fenix001 [56]

Answer:

There are 4 reading frames without stop codons.

Explanation:

1) To find the possible reading frames you need to separate your sequence in codons (trios)  for the 5'-> 3' sense, first, excluding the first nucleotide, then excluding 2 nucleotides and then not excluding nucleotides.

5'... C TTA CAG TTT ATT GAT ACG GAG AAG G... 3'  NO STOP CODON

5'... CT TAC AGT TTA TTG ATA CGG AGA AGG... 3'  NO STOP CODON

5'... CTT ACA GTT TAT <u>TGA</u> TAC GGA GAA GG... 3'

2)Then you find the complementary sequence (which you already have)

3'... GAA TGT CAA ATA ACT ATG CCT CTT CC... 5'

3'... GA ATG TCA AAT AAC TAT GCC TCT TCC... 5'

3'... G AAT GTC AAA TAA CTA TGC CTC TTC C... 5'

3) Next, you have to obtain the reverse complementary

CCT TCT CCG TAT CAA TAA ACT GTA AG NO STOP CODON

CC TTC TCC GTA TCA ATA AAC TGT AAG NO STOP CODON

C CTT CTC CGT ATC AAT AAA CTG <u>TAA</u> G

4)Now you need to find start (AGT in terms of DNA) and stop codons(<u>TAA</u>, <u>TAG,</u> <u>TGA</u>, also in terms of DNA), in 5->3 and de reverse complementary.

<em />

<em>As you can see, you have for open reading frames that lack of stop codon, unfortunately, they also lack of AGT, the start codon.</em>

I added a table where you can find thestart and stop codons as well as the proteins that they translate to in terms of RNA.

I hope you find this information interesting and useful, good luck!

8 0
3 years ago
Over time, what happens to a trait that is an advantage to an organism?
Charra [1.4K]
I remember back in 10th grade I learned that birds that had beaks that were easier to break the seeds carried those traits to their babies and the whole area had that type of beak since it was necessary to break some seeds. So the beaks that were a disadvantage no longer existed and the beaks that became an advantage passed along to all the other birds.

Side note: if they all had the same beak they could all fight for the same type of seeds and probably have some sort of intense competition but idk if that’s necessary
3 0
2 years ago
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