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hoa [83]
3 years ago
9

Why isn't it possible for adenine to pair with cytosine or guanine?

Biology
1 answer:
IRINA_888 [86]3 years ago
5 0

Answer:

Thymine and uracil or adenine have two hydrogen bonds between them, whereas guanine and cytosine have three.

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What role do stomata play in homeostasis
Hunter-Best [27]

Answer:

Homeostasis. Angiosperms or flowering plants maintain homeostasis by keeping their stomata (opening in the underside of a leaf that allows carbon dioxide to diffuse into and out of the leaf) open just enough to allow photosynthesis to take place but not so much that they lose an excessive amount of water.

I hope this is the right answer and I hope it helped.

-Jarvis

8 0
3 years ago
A 43-year-old Caucasian man with a 20-year history of bipolar disorder presents for the first time with long-term polyuria and p
PolarNik [594]

Answer:

The correct option is 2 Nephrogenic diabetes insipidus.

Explanation:

Nephrogenic diabetes insipidus (NDI) occurs when the renal tubule response to vasopressin (ADH) is weakened, resulting in the excretion of large volumes of dilute urine.

As the renal tubules do not respond to vasopressin (antidiuretic hormone) and are unable to reabsorb filtered water back into the body, the kidneys create a high volume of dilute urine in nephrogenic diabetes insipidus.

Nephrogenic diabetes insipidus (NDI) can be inherited or develop as a result of disorders that impede the ability of the kidneys to concentrate.

Therefore, the correct option is 2 Nephrogenic diabetes insipidus.

That is, the most likely cause of his polyuria is nephrogenic diabetes insipidus.

6 0
3 years ago
What three kinds of variations among organisms did Darwin observe during his voyage?
brilliants [131]

Answer : <em>shapes, lengths, and colors. Your welcome</em>

7 0
3 years ago
Color (black/gray/red) is a ___________ characteristic
Reil [10]

Their are three main characteristic is intensity, saturation, and hue .

Red color is motivated by power, black is achromatic color with hue  like white gray and white.black is symbol of darkness.  Brightly co-loured object is one that reflects and transmits a large portion of light falling on it.

The great amount of light is reflected on white screen while a black screen would not reflects any light. Co-lour  also linked with various personality trait , motivation and productivity levels in life. It symbolize life and death , love and evil and happiness and anger.Red color makes you feel passionate and energized.

To learn more about motivation here

brainly.com/question/972761

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7 0
2 years ago
You perform the following dihybrid cross: A blaBx Ab/aB. The A and B genes control different traits. What phenotypic ratio would
Luda [366]

Answer:

Option-D

Explanation:

In the given question the genotype of parental allele is- AbaB X AbaB. The alleles formed will be- AB, Ab,aB, ab in which the crossover allele will be AB and ab.

1. Unlinked genes

Now of these alleles are unlinked then the alleles will assort independently of each other therefore performing the punnett square we will get dihybrid ratio as 9:3:3:1 in which  

1. A_B_ are 9

2. aaB_ are 3

3. A_bb are-3

4. aabb- 1

Since the crossover allele are AB and ab therefore A_B_ are 9 and aabb- 1 represent recombinant genotype.

2. Linked genes

When the genes will be linked then chances of crossing over will be reduced as a result of which only two type of allele will be formed which are-  Ab and aB and the recombinant frequency will become less.

Crossing these allele will  form Aabb , AaBb , AaBb  and aaBB  genotypes. The recombinant ratio will decrease as A_B_ is 2 and aabb is not present.

Thus, option-4 which states that the unlinked ration is  9:3:3:1  and linked ratio is  <9: >3: >3: <1 is correct.

7 0
3 years ago
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