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Korvikt [17]
3 years ago
6

Light sensitivity in the euglena is provided by the eyespot. true or false??

Biology
2 answers:
madam [21]3 years ago
6 0
That statement is true
pshichka [43]3 years ago
6 0

Answer:

True

Explanation:

  • The eyespot is an organ that helps in light reception and is usually present in unicellular organisms and some multicellular invertebrates.
  • The eyespot is also present in Euglena, which is a green unicellular organism and the eyespot helps it to receive and detect light.
  • The light detection helps the euglena to move as the eyespot is located at the base of the flagellum and this eyespot helps influence the flagellar motion. 
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Answer:

Well for me I think it's

Explanation:

The dark phase

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Hurry! Will mark brianlest if correct, worth 11 points! Which best explains the zygote?
Usimov [2.4K]

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The correct answer is A. It has a diploid number of chromosomes.

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A swimmer sprints a short distance for a competition, the swimmer is not able to take in enough oxygen to make the ATP needed fo
OverLord2011 [107]

A swimmer sprints a short distance for competition. The swimmer is not able to take in enough oxygen to make the ATP needed for the sprint. Which of the following processes is most likely going to occur in the swimmer's muscle cells during the competition? (2 points)

A. Aerobic respiration would continue until oxygen is no longer available, leading to cell death.

B. Aerobic respiration will continue to make the same amount of ATP since oxygen is not required.

C. Anaerobic respiration would be used to produce small amounts of ATP in the absence of oxygen.

D. Anaerobic respiration will produce more ATP than the process used in the presence of oxygen.

<u>Answer:</u>

A swimmer sprints a short distance for competition. The swimmer is not able to take in enough oxygen to make the ATP needed for the sprint. Anaerobic respiration would be used to produce small amounts of ATP in the absence of oxygen and it is the process happens in the swimmer's muscle cells during competition.

<u>Explanation:</u>

  • A Swimming sprinter will spend his maximum energy while to cover a short distance in his competition. Quickly he will reduce his oxygen level.
  • Oxygen will produce an ATP molecule (Adenosine Triphosphate) which is required for a sprinter.
  • The ATP molecule will produce energy for the cells. Aerobic respiration takes place only when in the presence of oxygen.
  • While swimming they will not get enough oxygen so the Anaerobic respiration takes place to produce ATP molecule.

7 0
3 years ago
Degeneration of the dopamine-releasing neurons of the ________ is the ultimate cause of Parkinson's disease. Degeneration of the
slavikrds [6]

Answer:

a. substantia nigra

b. substantia nigra (it is repeated)

Explanation:

Parkinson's disease is a neurodegenerative disease that is caused by the death of neurons that release the neurotransmitter dopamine in the <u>substantia nigra</u>, or locus niger, -a region of the brain that regulates brain circuits that give the 'orders' to initiate voluntary movements- .

The lack of this neurotransmitter leads to the occurrence of the main symptoms suffered by patients: decreased movements, muscle stiffness, postural instability and tremor. These failures are generated by the abnormal way in which neurons work in the absence of dopamine through a mechanism that is not known in depth.

It is the second most frequent neurodegenerative disease, after Alzheimer's disease, with a prevalence of 2% in people over 65 years. The characteristic symptoms of stiffness, bradykinesia and tremor are associated with losses of neurons in the substantia nigra and dopamine depletion in the striatum. There are large cytoplasmic inclusions, called Lewy bodies, which are the pathological mark of the disease and appear predominantly in neurons that contain melanin of the nigra substance. Genetic studies in a subgroup of families with Parkinson's disease with autosomal dominant inheritance found a locus on chromosome 4q-21 23 and a mutation in the gene that encodes a synaptic protein, α-synuclein.

7 0
3 years ago
What does it mean if somebody has a lump under their testes?
quester [9]
Answer is

C cancer

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