CHAPTER 3 HW

Which of the following events occurs during transcription?

A molecule of RNA is formed based on the sequence of nucleotides in DNA.

Part complete The odd position of Jackson's heart is related to a disorder with his cilia called primary ciliary dyskinesia (PCD). What are cilia?

Cilia are numerous motile extensions of the plasma membrane that have an internal arrangement of nine pairs of microtubules surrounding a central microtubule pair (9+2 array).

Which one of the following does not play a role in translation?

DNA

The majority of individuals with PCD have defects associated with the ciliary protein dynein, which functions in the cilia's motility. Many of these affected individuals have mutations associated with two genes: DNAI1 and DNAH5. How do genes relate to proteins?

Genes are a set of nucleotides in a strand of DNA that specify the specific sequence of the amino acids that comprise a protein.

Cilia are composed of microtubules. How are microtubules different from the other cytoskeletal filaments?

Microtubules are hollow tubes with a diameter of 25 nanometers and are composed of the protein tubulin.

Jackson has a PCD (primary cilia dyskinesia) where his cilia have defects that affect their motility. How is this related to Jackson's respiratory symptoms?

Motile cilia are found on cells lining the trachea. The cilia move together in a coordinated wave, helping to push contaminated mucus and fluids out of the respiratory tract. When the cilia have motility issues, these secretions are not cleared, and respiratory infections are the common result.

Which of the following enzymes will promote the formation of hydrogen bonds between the DNA template and the complementary RNA nucleotides during the process of transcription?

RNA polymerase

Cancer is characterized by mutations that disrupt normal cell growth and function. The mutations change normal genes into __________.

oncogenes

The site of translation is

ribosomes in the cell cytoplasm.

Differentiation requires __________ of particular genes to produce cell populations with __________ capabilities that form tissues.

inactivation; limited

Which of the following correctly lists the steps of translation in order?

initiation - elongation - termination

Which of the following does not occur during RNA processing?

mRNA attaches to the small subunit of a ribosome.

Which of the following is a correct statement about mRNA?

mRNA moves from the nucleus to the cytoplasm following RNA processing.