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I am Lyosha [343]
3 years ago
7

The cross bridge cycle is a series of molecular events that occur after excitation of the sarcolemma. What is a cross bridge?

Biology
1 answer:
Delvig [45]3 years ago
7 0

Answer:

The correct answer is C: a myosin head bound to actin.

Explanation:

The cross bridge cycle is a series of events that occur during muscle contraction. When muscle contracts, a myosin head (projected from a thick myosin filament) attaches to a thin actin filament <em>(this is the so-called cross bridge).</em> The thin filament also contains tropomyosin and troponin.

Then, a second myosin head binds to ATP and catalyzes it in presence of calcium. This step gives the muscle the energy to contract.

Without calcium, tropomyosin and troponin avoid myosin and actin to interact.

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What is the purpose of the eyespot in a euglena?
Otrada [13]

The eye spot of euglena is to detect the intensity of light.

<h3>COMPONENTS OF EUGLENA:</h3>

Euglena is a protist that possesses the characteristics of plant and animal. It is a unicellular and microscopic organism.

Euglena possesses certain structures that serve different purposes in the cell. They include:

  • Gullet
  • Eye spot or stigma
  • Chloroplast
  • Pellicle

Therefore, the eye spot as a structure is used to detect the intensity of light.

Learn more about euglena at: brainly.com/question/14992?

6 0
2 years ago
Read 2 more answers
Diffusion is the movement of particles against the concentration gradient
lys-0071 [83]

Answer:

incorrect

Explanation:

diffusion is the movement of particles <u>with</u> the concentration gradient

for example: over time, food coloring and water mix and become one same color.

3 0
2 years ago
I weigh around 126 pounds, and my height is 5''4. I'm almost 13. Am I overweight?
kap26 [50]
Your BMI (body mass index) is 21.6, which is a normal BMI. So, you are NOT overweight. 
8 0
3 years ago
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Which of the following is a scientific statement?
skad [1K]

The correct answer is D. According to DNA comparisons, humans share a common ancestor with chimpanzees.

Explanation

A scientific statement is a statement made based on scientific evidence, that is, a scientific statement is the result of several tests focused on testing a hypothesis or proposal. These scientific statements can be developed in different areas of knowledge such as science, biology, physics, mathematics, geometry, among others. they are also predominant in the exact sciences because in the human sciences it is complicated to establish scientific statements because human behavior does not obey exact laws. According to this definition, option D. is the correct answer because it refers to DNA tests between humans and chimpanzees and therefore this is based on scientific evidence and tests.

6 0
3 years ago
I need help please this is important
Kisachek [45]

Answer:

A) CcSs

Explanation:

In order to have all of the combinations both parents must have both dominant and recessive alleles for both traits. This is because the only time a recessive phenotype appears it must have two recessive alleles for that trait (genotypes such as ccss, or ccSS/ccSs if just recessive color, and CCss/Ccss if just recessive spots)

3 0
3 years ago
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