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In all types of cells, the ribosome is composed of two subunits: the large (50S) subunit and the small (30S) subunit (S, for svedberg unit, is a measure of sedimentation velocity and,...
- Noncoding Rna and Gene Expression
It is estimated that the human genome encodes approximately...
- Noncoding Rna and Gene Expression
Arrange the steps involved in processing primary mRNA to form a mature mRNA molecule. Start with the first step on the top of the list and proceed down. DNA ultimately determines the sequence of amino acids in a polypeptide. 1. Initiation. 2. Elongation cycle. 3. Termination.
Study with Quizlet and memorize flashcards containing terms like Identify the new nucleotides that have been created by scientists., Which of the following are found in all DNA nucleotides?, DNA replication occurs during the _____ phase of the cell cycle. and more.
However, most genes in a cell produce mRNA molecules that serve as intermediaries on the pathway to proteins. In this section we examine how the cell converts the information carried in an mRNA molecule into a protein molecule.
As cells enter mitosis, their chromosomes become highly condensed so that they can be distributed to daughter cells. The loops of 30-nm chromatin fibers are thought to fold upon themselves further to form the compact metaphase chromosomes of mitotic cells, in which the DNA has been condensed nearly 10,000-fold ( Figure 4.12 ).
Explain the relationship between genes and alleles. Put the following in order of size, from smallest to largest: chromosome; gene; base pair; Sex-linked genes are usually found on which chromosome? Explain why these genes are called sex-linked. Which of the following are considered homologous chromosomes? Chromosome 22 and the X chromosome
Explain how intermolecular forces between specific proteins and DNA help form nucleosomes, chromatin loops, and ultimately interphase chromosomes. Compare and contrast euchromatin and heterochromatin, and explain how histone modification can act as a catalyst for chromatin remodeling to convert from one form to the other.
