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4 years ago

Which of these is an example of a hypothesis?

Biology

2 answers:

Anni [7]4 years ago

5 0

Sisissknejelsosoeoeoeeoeoeeo

puteri [66]4 years ago

4 0

A. Add different kinds of soil to three potted plants

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Genes have many regulatory sites that control gene expression, one of these is called the enhancer.

madam [21]

Answer:

a) The enhancer site is a distal control site many nucleotides upstream from the promoter site, and activates the initiation complex of transcription.

Explanation:

Enhancers are the regulatory DNA sequences that are generally located quite away from the coding regions of a gene. These sequences are mostly present upstream of promoter sequences. Enhancers regulate the gene expression by stimulating the formation of an active transcription initiation complex and thereby, increase the rate of RNA synthesis. Enhancers also serve as the binding site for specific regulatory proteins. These proteins bound to the enhancers then activate transcription by interacting with the proteins bound to the promoters.

8 0

3 years ago

One group of scientists believe that sea levels have risen because of global warming. Another group of scientists believe that s

solniwko [45]

B. There are several new ideas about the causes of rise in sea level.

3 0

3 years ago

Why is carbon considered tetravalent?

USPshnik [31]

All what the word tetravalent means is that carbon can form 4 chemical bonds, due to the fact that carbon has 4 unpaired valence electrons in its furthest shell, which can be used to bond to other atoms, to form linear and cyclic structures in organic compounds.

Tetravalent also tells us indirectly what the molecular geometry of the atom would be if bonded to those number of bonds, if 4, then it would be tetrahedral and have bond angles of 109.5.

6 0

4 years ago

Solar system included all of the following except what?

inna [77]

Answer: Stars?

Explanation: I think it is stars because there is only one star in our solar system. I don't know for sure if it is, but I think it is. Don't be too sure of my answer.

3 0

3 years ago

In a plant species, you notice that purple and yellow leaf colors, as well as hairy and smooth stems segregate independently. Yo

Reptile [31]

Answer:

The required answer is given below:

Explanation:

a) Assuming C is the gene for leaf color and S is the gene for the stem type.

then, the genotypes for each parent would be-

Yellow leaves, hairy stem parent: ccSs

Purple leaves, hairy stem parent: CcSs

b) Expected ratios of the progeny as below:

68 yellow leaves, hairy stems: 3/8

66 purple leaves, hairy stems: 3/8

22 purple leaves, smooth stems: 1/8

25 yellow leaves, smooth stems: 1/8

Hence, the ratio is - 3:3:1:1

It might possible that independently assorting single gene pairs could control traits, and that one of the alleles in each pair is dominant.

c) The general formula for calculating X2:

X2 = the sum of (O - E)2/E,

(where O = observed number)

(E = expected number)

So,

(68 – 68)2 /68 + (66 – 68)2/68 + (22 – 23)2 /23 + (25 – 23)2/23

= 0.276

X2 = 0.276

The chi-square statistic too small, Hence the hypothesis is acceptable.

5 0

3 years ago