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stich3 [128]
3 years ago
6

Which of the following is an example of a dihybrid cross?

Biology
1 answer:
True [87]3 years ago
5 0

The best answer for this is B. AaAA
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An enzyme contains a catalytic histidine residue in its active site that must release an R group proton to solution in order to
hjlf

Options missing:

a) The pH of the environment should be relatively high.

b) The pH of the environment should be relatively low.

c) The pH of the environment would not matter.

d) The environment should be set to the biochemical standard state.

Answer:

a) The pH of the environment should be relatively high.

Explanation:

For optimal function an enzyme needs a certain environment or condition. As temperature increases, the rate of enzyme activity also increases. As temperature increases toward its optimum point of 37 degrees Celsius (98.6 F), hydrogen bonds relax and make it easier for the hydrogen peroxide molecules to bind to the catalase.

The part of the enzyme where this reaction takes place is called the active site. A temperature that is higher or lower than this optimum point changes the shape of the active site and stops the enzyme from working. This process is called denaturation.

Enzyme pH levels also change the shape of the active site and affect the rate of enzyme activity. Each enzyme has its own optimal range of pH in which it works most effectively. In humans, catalase works only between pH 7 and pH 11. If the pH level is lower than 7 or higher than 11, the enzyme becomes denaturated and loses its structure. The liver sustains a neutral pH of about 7, which creates the best environment for catalase and other enzymes.

General acid catalysis would require histidine to be protonated at pH values (pH 8.0) optimal for enzymatic activity which is relatively high.

3 0
3 years ago
Which of these statements is not true of the phylogenetic tree?
ivann1987 [24]

Answer:

The answer is A.

Explanation:

Phylogenetic trees are only concerned with hard data (time points of when species evolve) and not soft data like how great a species is.

3 0
2 years ago
The primary stimulus for release of adrenal medullary hormones comes from Select one: a. the kidneys. b. aldosterone. c. the ant
Natasha_Volkova [10]

Answer:

Correct answer is ''e'' the sympatetic nervows system

Explanation:

THE ENDOCRINE SYSTEM How does the endocrine orchestra work? 1- Nervous Stimuli to the Hypothalamus  production of releasing (stimulatory) or inhibitory hormones, transported via a portal system of vessels to the anterior pituitary gland 2- Anterior Pituitary Gland  pituitary trophic hormones 3- Pituitary trophic hormones stimulate Peripheral Endocrine Glands  production of peripheral hormones 4- Hormone/Receptor Interactions in target organs  hormone actions 5- Peripheral hormones exert Negative Feedback Mechanisms  supression of hypothalamic & pituitary hormones.

6 0
3 years ago
Read 2 more answers
Dialysis tubing is permeable to water molecules but not too sucrose. Three dialysis tubes are filled with various solutions and
almond37 [142]

Answer:

tube 3

Explanation:

because it contains pure water

7 0
2 years ago
Why is it important to predict evolutionary responses of a population?
Elden [556K]

Answer:

Because it help us to maintain biodiversity of our planet.

Explanation:

3 0
3 years ago
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