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Citrus2011 [14]
3 years ago
14

How do birds digest their food in the absence of teeth?

Biology
1 answer:
vodka [1.7K]3 years ago
3 0

Answer:

They have a gizzard to grind the food.

Explanation:

Birds cannot chew since they have no teeth. However, the beak allows them to split very large seeds or swallow them directly.

For their digestion they have a stomach where digestion enzymes are released. Also they have a gizzard that is an organ that grinds the food mechanically. This gizzard usually has small stones inside that were previously ingested and that helps to digest the food.

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Chemicals used in chemotherapy treatments to fight cancer can also harm cells in hair follicles and bone marrow. What characteri
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Answer:

C. they divide rapidly

Explanation:

Chemo tragets rapidly growing cells which are present in cancerous tumors, hair follicles and bone marrow.

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3 years ago
For an offspring to blank a recessive trait both parents must have at least one blank allele in their genotype
Svetlanka [38]

Answer:express,recessive

Explanation:

i have the answer key.

3 0
2 years ago
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How do axial filaments differ from regular bacterial flagella?
Elena L [17]

Answer: D

Explanation: the axial filament is madeup of hundreds of fimbrils. It is an organ of locomotion in organisms. It is located between the cell membrane and the outer membrane thereby giving the organism the ability to make a twisting motion. Example of organism that possess axial filaments is the spirochetes

3 0
3 years ago
N
artcher [175]

Answer:

C The sarcomere is contracted, and the actin and myosin filaments are completely overlapped.

Explanation:

In rest, the tropomyosin inhibits the attraction strengths between myosin and actin filaments. Contraction initiates when an action potential depolarizes the inner portion of the muscle fiber. Calcium channels activate in the T tubules membrane, releasing calcium into the sarcolemma. At this point, tropomyosin is obstructing binding sites for myosin on the thin filament. When calcium binds to troponin C, troponin T alters the tropomyosin position by moving it and unblocking the binding sites. Myosin heads join the uncovered actin-binding points forming cross-bridges, and while doing so, ATP turns into ADP and inorganic phosphate, which is released. Myofilaments slide impulsed by chemical energy collected in myosin heads, producing a power stroke. 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. Finally, Z-bands are pulled toward each other, shortening the sarcomere and the I-band, producing muscle fiber contraction.

In the sarcomere, which is the contractile unit of skeletal muscles, there are

  • Thick myosin myofilaments in the central region belonging to the A band.  
  • Thin filaments united to the Z lines, extending in the interior of the A band until they reach the border of the H band.  
  • Thin actin filaments composing the I band, which belong to two sarcomeres adjacent to a Z line.

When the muscle contracts, the muscular fiber gets shorter and thicker due to the reduction in the length of the sarcomere. The H line and the I band get shorter. The Z lines get closer to the A band, meaning that they get closer to each other. A band keeps constant in length. This change is produced by movement mechanisms that involve a change in the relative position of actin and myosin filaments.

3 0
3 years ago
A.What type of bond connects the two different strands of DNA?
DerKrebs [107]

Answer:

Hydrogen bonds

Explanation:

Hydrogen bonds exist between the two strands and form between a base, from one strand and a base from the second strand in complementary pairing. These hydrogen bonds are individually weak but collectively quite strong.

4 0
2 years ago
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