b. a transmission electron microscope, because it has high resolution
A scanning electron microscope would be the best choice for a scientist examining the living cells lining the respiratory tract. This is due to its capability of scanning the surface of the whole cells, which is essential to properly observe the tiny hairs on these cells that move dirt and mucus away from the lungs.
To explore living cells lining the respiratory tract, the best instrument would likely be a scanning electron microscope (SEM). While both SEM and transmission electron microscopes provide high-resolution images, a key difference is how they interact with the specimen. The SEM scans the surface of whole cells, making it ideal for observing the tiny hairs, or cilia, on the cells of the respiratory tract. These tiny hairs move in coordinated waves, pushing mucus and trapped particles out of our lungs. This process can be best observed on the whole cell surface, which is why SEM would be preferred.
#SPJ2
B. animal cell
C. cell membrane
D. DNA molecule
The study of the DNA molecule was instrumental in the formulation of the modern cell theory.
The contemporary cell theory, a key idea in biology, asserts that all living things are made up of one or more cells, that cells are the essential building blocks of life, and that all cells develop from already-existing cells. This notion was developed in large part as a result of research into the DNA molecule.
Significant insights into the mechanisms underpinning cellular operations and heredity have been gained through understanding DNA's structure, function, and involvement in genetic inheritance. The notion that cells are the basic unit of life and carry the genetic information essential for an organism's growth, development, and survival was further cemented by findings linked to DNA replication, gene expression, and mutations.
As a result, the comprehensive and widely embraced contemporary cell theory was made possible by research into the DNA molecule.
To know more about DNA here brainly.com/question/16099437
#SPJ2
A cell wall was instrumental. Hope I helped!
Answer:true
Explanation: cause heterozygous means that 2 or more of offspring genes are recessive
Answer:
Eukaryotic cells evolved from prokaryotic cells.
Explanation:
The endosymbiotic theory states that some of the organelles in today's eukaryotic cells were once prokaryotic microbes. Mitochondria and chloroplasts are believed to have been developed over time.
B. dense irregular connective tissue
C. dense regular connective tissue
D. reticular connective tissue
The lamina propria, found in various organs in the body, is composed of loose connective tissue. It serves as a supportive framework and is crucial for immune response.
The lamina propria is a component of the mucosa layer in various organs in the body, including the digestive and respiratory tracts. Regarding its composition, the lamina propria is composed of loose connective tissue. This type of tissue is characterized by its loose, flexible structure, which allows it to provide support and nourishment to surrounding structures. The lamina propria, therefore, serves as a supportive framework and plays a key role in immune response within the mucosa.
#SPJ6