1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Lelechka [254]
3 years ago
13

Which best describes a scientific theory?

Biology
1 answer:
Alex777 [14]3 years ago
8 0

Answer:

C.

Explanation:

A theory is not a guess but an explanation of <u><em>why</em></u> things happen.

You might be interested in
What would an orange grove farmer be most concerned about?
olchik [2.2K]
"A" I think... Sorry if its not right...
3 0
2 years ago
Please also describe how actin-binding sites are made available for cross-bridging with myosin heads during contraction.
yaroslaw [1]

Answer: The calcium ion binds to troponin, and this slides the tropomyosin rods away from the binding sites.

Explanation:

Contraction and relaxation of muscle cells brings about movements of the body. The contractile myofilament called sarcomeres are bounded at each end by a dense stripe called the Z - line, to which the myosin fibres are attached, and lying in the middle of the sarcomere are the actin filaments, overlapping with the myosin.

When action potential spreads from the nerve along the sarcolemma (muscle cell membrane), it penetrates deep into the muscle cell through the sarcoplasm (cytoplasm of muscle cell), and releases CALCIUM from the intracellular stores.CALCIUM triggers the binding of myosin to the actin filament next to it forming CROSS BRIDGES.

For this to occur, ACTIN BINDING SITE has to be made available. TROPOMYOSIN is a protein that winds around the chains of the actin filament and covers the myosin-binding sites to prevent actin from binding to myosin. The first step in the process of contraction is for calcium ions to bind to troponin so that tropomyosin can slide away from the binding sites on the actin strands.

3 0
2 years ago
Que es eso díganoslo
aniked [119]

Answer:what

Explanation:

4 0
2 years ago
If instead of ACT, the first DNA triplet was ACG, which amino acid would be coded for?
BigorU [14]
<span>The answer is cysteine. This is a half essential proteinogenic amino acid with the formulation of HO₂CCHCH₂SH. It is prearranged by the codons UGU and UGC. The thiol side chain in cysteine frequently partakes in enzymatic responses, as a nucleophile.</span>
6 0
3 years ago
Read 2 more answers
Which of these statements is true of the hypothalamus? a) It controls emotional responses and provides information on equilibriu
trasher [3.6K]

Answer: B) It controls the autonomic nervous system and regulates hunger and thirst sensations.

8 0
3 years ago
Other questions:
  • Biomolecules biology help please
    5·1 answer
  • A vibration that produces that wave takes 5 Seconds to complete what is the frequency of the wave
    13·1 answer
  • If the answer is right i will give Brainlyiest answer.
    11·2 answers
  • Explain how the presence of coal-fired electricity plants can affect the ability of lakes to support life?
    6·1 answer
  • What is one specific example of negative feedback in the human urinary system?
    15·1 answer
  • Plants, animals, and the environment are not dependent on each other for the use of Carbon and Oxygen.
    15·1 answer
  • Which of the following is a true statement regarding microclimates?
    10·2 answers
  • Describe two negative ways that the animals living in the area have been affected by the
    15·1 answer
  • Who was A.F.A king ? ​
    12·1 answer
  • Which of the following relationships is symbiotic?
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!