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raketka [301]
3 years ago
6

The wings of swallows and dragonflies perform the same function: they enable the organisms to fly. Based on these images, what i

nterpretation can be made?
A. Swallows and dragonflies have homologous organs, which indicates that they share common ancestors
B. Swallows and dragonflies have analogous organs, which indicates that their wings evolved differently
C.Swallows and dragonflies have homologous organs because their wings evolved from the same ancestral species
D.Swallows and dragonflies have analogous organs because they belong to the same species
Biology
1 answer:
ValentinkaMS [17]3 years ago
6 0

Homologous organs or structures have the same ancestry but different functions such as the human arm, the bat's wing and the dog's leg. All originate in the mammal's common ancestor. Over time, these structures have evolved and changed their purpose to better suit their current environments.

Analogous organs are the opposite. They have similar functions but different evolutionary origins. The wings in swallows and dragonflies are such an example.

Thus, the correct interpretation is B. Swallows and dragonflies have analogous organs, which indicates that their wings evolved differently.

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DCCD (dicyclohexylcarbodiimide) inhibits oxidative phosphorylation when the substrate is mitochondrial NADH. DCCD is a drug that
VARVARA [1.3K]

Answer:

A) Decreases cellular energy production

B) DCCD also affects K+ transport

Explanation:

A) Consequences are of DCCD on cellular energy production: <em>Decreases cellular energy production</em>

ATP-synthase pump is composed of two subunits: F1 catalytic subunit that synthesizes ATP, and F0 proton pumping subunits, that transport H+ through the membrane. F1 subunit might act independently of F0 to produce ATP, but this molecule can not be released without H+ gradient, which generates a movement necessary for ATP release from the catalytic center.

When any of the parts composing F0 react with DCCD, the subunit can not transport H+ through the membrane. DCCD inhibits the enzyme activity by blocking the protons´ flow.

As DCCD blocks the protons´ flow, and the protons´ flow is necessary to release the ATP molecule from the F1 subunit, no other ADP + Pi can enter to F1 subunit, and the production of ATP stops.

B) Other cellular effects of DCCD

There seem to be other effects of DCCD on cell activity, some of which are still under study. To name a few:

  • Diimide from DCCD seems to stimulate cytochrome b reduction and inhibits its reoxidation by ferricyanide.
  • When exposing the cell to high concentrations of DCCD for a long time, might occur an alteration in the electron transporting chain
  • Inhibition of ubiquinol-cytochrome c reductase activity when exposing the cell to high concentrations of DCCD.
  • Inhibition of K+ transport, associated with the inhibition of H+ transport.

Concerning the effect of DCCD on the K+ transport, DCCD stops the extrusion of H+ and the consequent intrusion of K+.

DCCD strongly inhibits the simultaneous flow of H+ and K+. First, it inhibits H+ flow, acidification of the environment stops, but at this point, K+ keeps moving through the membrane. Once the H+ flow has ceased, the K+ flow slowly decreases until it finally stops moving. There is a lag time in the DCCD effect on K+ flow to the instantaneous effect on H+ flow.

5 0
3 years ago
What are the four commonly recognized objectives in the interrogation process?
USPshnik [31]
Interviews:
- Objective: purpose is to obtain Information
- Minimal legal requirements; no rights warnings
- cooperative relationship between interviewer and subject likely
- no guilt
- moderate planning
- Most Important: private and semiprivate; distraction could cause witness to forget key info

- Interrogations
- Objective: purpose is to test information already obtained, obtain valuable facts; eliminate the innocent; identify the guilty; obtain a confession
- extensive pre interrogation legal requirements; rights required
- hostile relationship likely
- guilt suggested
- extensive planning
- absolute privacy
7 0
3 years ago
Five factors that influence the value of a fuel?
Allushta [10]

The five are costs, availability, safety, content, and byproducts of the fuels use. Hope I helped!

7 0
3 years ago
Which of the following is true of Mendelian inheritance
Ksivusya [100]
<h2><u>Answer</u> :</h2>

The correct option is A. If a dominant allele is present, the recessive allele won’t be seen.

The dominant allele is the one which appear, and the recessive one isn't shown.

For example - If a person has 2 alleles of eye colour as B ( black ) and b ( brown ), in which black is dominant and the brown one is recessive, then the person will have black eye colour because only dominant allele shows its characteristics.

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8 0
3 years ago
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3 years ago
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