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
xenn [34]
3 years ago
12

Which change is chemical?

Biology
1 answer:
liraira [26]3 years ago
8 0
Water evaporating is a chemical change so 4
You might be interested in
A news report shows a city right after
nydimaria [60]

Answer:

yes

Explanation:

because earthquakes can start fires when gas lines are dislodged due to the earth's shaking.

7 0
3 years ago
HELP HELP!! Why might you find fewer photosynthetic organisms at deeper levels of an ocean? Group of answer choices
riadik2000 [5.3K]
1.
B
Photosynthetic organisms require light, in which the sun’s rays can only go so far
2.
C
The energy flow pyramid goes from decomposers to producers, meaning that if producers are dying out due to lack of nutrients, there must be something wrong with the decomposer population
4 0
3 years ago
A lizard was injured in my backyard, what do I need to do to help it heal?
Roman55 [17]
How badly injured is it?
5 0
3 years ago
Read 2 more answers
When a muscle cell contracts, Group of answer choices the position of each myosin head is identical at any given moment. some my
White raven [17]

Answer:

When a muscle cell contracts, the myosin heads each produce a single power stroke.

Explanation:

In rest, attraction strengths between myosin and actin filaments are inhibited by the tropomyosin. When the muscle fiber membrane depolarizes, the action potential caused by this depolarization enters the t-tubules depolarizing the inner portion of the muscle fiber. This activates calcium channels in the T tubules membrane and releases calcium into the sarcolemma. At this point, <em>tropomyosin is obstructing binding sites for myosin on the thin filament</em>. When calcium binds to the troponin C, the troponin T alters the tropomyosin by moving it and then unblocks the binding sites. Myosin heads bind to the uncovered actin-binding sites forming cross-bridges, and while doing it ATP is transformed into ADP and inorganic phosphate which is liberated. Myofilaments slide impulsed by chemical energy collected in myosin heads, <u>producing a power stroke</u>. The power stroke initiates when the myosin cross-bridge binds to actin. As they slide, ADP molecules are released. A new ATP links to myosin heads and breaks the bindings to the actin filament.  Then ATP splits into ADP and phosphate, and the energy produced is accumulated in the myosin heads, which starts a new binding cycle to actin.  Z-bands are then pulled toward each other, thus shortening the sarcomere and the I-band, and producing muscle fiber contraction.

3 0
3 years ago
One substance has no membrane transporters to move it but can diffuse freely through open leak channels if there is a concentrat
Rama09 [41]
<h2>Urea </h2>

Explanation:

Urea is a small nitrogenous compound which is the main end product of protein catabolism in mammals

  • Urea is a nitrogen-containing substance normally cleared from the blood by the kidney into the urine
  • It is made predominantly in the liver from ammonia and bicarbonate and is one of the main components of urine
  • The rate of synthesis varies from 300 to 600 mmol/day depending on the protein intake
  • All of this urea eventually finds its way into the urine
  • Because urea makes up a large part of the obligatory solute excretion, its osmotic pressure requires significant volumes of water to carry the urea
  • Urea passively crosses biological membranes, but its permeability is low because of its low solubility in the lipid bilayer
  • Some cells speed up this process through urea transporters, which move urea by facilitated diffusion
  • Urea is passively reabsorbed in the proximal tubule, but its route of transport is not clear
  • Urea transporters have not yet been identified for the proximal tubule
3 0
3 years ago
Other questions:
  • where did the idea for it come from, what did sputnik do and can you think of anything else about sputnik,
    5·1 answer
  • Aristotle defines a virtue as a(n) __________ that requires __________.
    5·1 answer
  • The term _____ literally means "gamete-producing plant." sporophyte gymnosperm angiosperm gametophyte
    10·2 answers
  • What kind of rock can you MOST LIKLEY find in the area shown in the picture?
    15·2 answers
  • Lactic acid fermentation in humans can lead to cramping due to lack of
    5·1 answer
  • Why is the weight of an object more on Earth than on the Moon?
    5·2 answers
  • What classes do you have in your chart?
    7·1 answer
  • Which medical conditions are associated with large amounts of fat and sugar in your diet? Select three options.
    14·1 answer
  • QUESTION AND DIAGRAM IN THE PICTURE<br> CORRECT ANSWE GETS BRAINLIEST <br> REPORTING ANY LINKS
    13·2 answers
  • Can u guys help me with thjis bio question
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!