Answer:
power stroke
Explanation:
The process of muscle contraction requires several steps. The most famous theory on how the contraction and relaxation of muscles take place is the sliding filament theory. However, this theory has been refined and one important addition to it is the mechanism by which myosin can pull actin and cause shortening of the sarcomere. For the movement of myosin, it binds and releases actin and forms cross bridges. Myosin is subdivided into two regions - S1 and S2. The contraction of the S1 region is what constitutes the power stroke. An important requirement of the power stroke is the hydrolysis of ATP to release an inorganic phosphate which provides energy for the process.Which step of mitosis involves the condensing of dna into chromosomes?
Answer:
Prophase
Explanation:
the condensing and coiling of DNA into chromosomes. The step that takes up 60% of the time that the cell is undergoing mitosis.
Answer:
Prophase
Explanation:
A fast-twitch muscle would: A. consume more ATP than slow-twitch fibers, but have fewer mitochondria. B. obtain energy mainly through glycolysis. C. have less resistance to fatigue than slow-twitch fibers. D. All of these choices are correct.
Answer:
A fast-twitch muscle would:
Consume more ATP than slow-twitch fibers, but have fewer mitochondria.
Obtain energy mainly through glycolysis.
Have less resistance to fatigue than slow-twitch fibers.
All the above mentioned are correct
Explanation:
A woman of blood type A marries a man with blood type O. The woman's mother had blood type B and her father had blood type AB. The man's mother had blood type B and his father had blood type A. What is the genotype of the woman?
a) AO
b) BO
c) AA
d) BB
e) AB
f) O
Determine whether the statements about DNA are true or false.
DNA contains all the genetic information within an organism.
DNA translates nitrogenous bases into proteins.
DNA contains many chromosomes that are passed from parent to offspring during reproduction.
1. true
2. false
3. false
✔ true
DNA contains all the genetic information within an organism.
✔ false
DNA translates nitrogenous bases into proteins.
✔ false
DNA contains many chromosomes that are passed from parent to offspring during reproduction.
Which quartz sample has probably undergone abrasion in a stream for the longest period of time?
1)A
2)B
3)C
4)D
Abrasion means scraping or wearing away. Thus option A is correct
What is abrasion ?Abrasion is easily recognized form of wear.
The hard particles can scratch softer surfaces when they are forced.
It can be associated either with surface movement with packed particles soil, sand, rocks or hard particles trapped between machine surfaces.
There are two types of abrasion such as low stress abrasion other wise known as two-body abrasion.
secondly high stress abrasion or three-body abrasion which is more severe because it can increases the chances of fracture of the abrasive particles.
Quartz is a hard, crystalline second most abundant mineral available in earth's crust made up of silicon dioxide.
One of best classified quartz is called as gemstones and antiquity a variety of quartz commonly used in jewelry and hardstone carvings. It is a substance which undergo abrasion for a long period.
Hence option A is correct.
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Which statement below correctly explains and gives the importance of the endosymbiotic theory?
A. The endosymbiotic theory states that the inner and outer membrane of the endoplasmic reticulum indicates these were once free living organisms which were taken into an early cell via endocytosis. The theory was further supported by the presence of prokaryotic ribosomes and replication of the endoplasmic reticulum via binary fission.
B. The endosymbiotic theory states that the inner and outer membrane of the mitochondria indicates these were once free living organisms which were taken into an early cell via endocytosis. The theory was further supported by the presence of prokaryotic ribosomes and replication of mitochondria via binary fission.
C. The endosymbiotic theory states that through endocytosis, early prokaryotic cells were able to bring in additional nutrients. These additional nutrients provided important energy that drove evolution of these prokaryotic cells into the eukaryotic cells seen today in more advanced organisms.
D. The endosymbiotic theory states that through endocytosis, early prokaryotic cells were able to bring in early energy rich eukaryotic cells. The energy provided drove evolution of these prokaryotic cells into the eukaryotic cells seen today in more advanced organisms.
Answer:
I believe it is b but i am not 100% sure.
Explanation:
hair color is determined by one gene. true or false
Answer:
Explanation:
the answer depends
Glucagon allows glucose to enter the blood from alpha cells.
True
False
Answer:
True
Explanation:
Glucagon is a hormone that is involved in controlling blood sugar (glucose) levels. It is produced by the alpha cells, found in the islets of Langerhans, in the pancreas, from where it is released into the bloodstream.
consider the structure and function of fats to predict which animal would have more fat: one that live close to the poles or one that lives close to the equator?
Considering the structure and function of fats, an animal living near the poles would have more fat than an animal living near the equator. This is because fats provide insulation and store energy, which are crucial for survival in colder climates with seasonal food availability.
Explanation:The structure and function of fats in an animal's body directly relate to the environment in which the animal lives. Fats serve primarily as energy storage and insulation. Considering this, an animal living close to the poles would need more fat compared to an animal living near the equator.
Animals in colder climates, like the poles, accumulate more fat for insulation to maintain their body temperature. The fat layer acts as a barrier, reducing heat loss and protecting them from freezing temperatures. Additionally, food resources in these regions could be scarce, especially in winter, so animals here need more fat reserves to supply energy when food is hard to find.
On the contrary, animals living near the equator, where climate is generally warmer and food is more abundantly available throughout the year, typically have less body fat as they require less insulation and energy storage.
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