B the origin of new matter in the steady state theory???
Answer:
A band - light central region of sarcomere.
Explanation:
Sarcomere is the basic structural unit of the skeletal muscles. These sarcomere shows striations ( light and dark bands) when veiw under the microscope.
A band or anisotropic band is the dark region of sarcomere. A band consists of both thick and thin filaments of actin and myosin proteins. The A band has the ability to refract light and appears dark.
Thus, the correct answer is option (D).
Answer: DNA contains the nucleotides guanine (G), cytosine (C), adenine (A), and thymine (T). RNA contains the nucleotides guanine (G), cytosine (C), uracil (U), and thymine (T). The difference between the two is that RNA contains uracil (U) rather than adenine (A).
The base pairs in DNA are adenine with thymine and guanine with cytosine. The base pairs in RNA are uracil with thymine and guanine with cytosine.
They are only present in plant cells an they are green pigment and where photosynthesis take place
Answer:
d. All of the listed statements are true.
Explanation:
Chromatin is presnet in the chromosome consist of protein and protein. histones are themajor proteins in chromatin that help in the compact packaging of the DNA in the cell nucleus.
<u>There are several problems posed by chromatin during transcription:</u>
- During transcription, protein can interfere with the chromatin structure at specific locations and interefere with its structure.
- Histone post-translation modifications (PTMs) regulate the structure of chromatin and also guide the remodeling enzymes which use the energy derived from ATP hydrolysis to reposition nucleosomes.
- During replication the chromatin structure rearrange itself in order to make the new DNA fit inside the nucleus.
Hence, the correct option is d.