Unit 4 Exam

Question 1

Constiutive genes

Answer 1

genes that are always expressed

Question 2

housekeeping genes

Answer 2

a type of constitutive genes that are necessary for cellular function

Question 3

Topoisomerases

Answer 3

proteins involved in DNA supercoiling
prevent overwinding (more than one turn per 10 b.p.) during cellular processes like replication

Question 4

DNA packing (Eukaryotes)

Answer 4

Histones connect to DNA and bind them forming chromatin
Influenced by environmental factors that affect presence of methyl groups on cytosine

Question 5

DNA supercoiling (prokaryotes)

Answer 5

Topoisomerases involved
DNA gyrase (type of topoisomerase) prevents over binding
histone-like proteins bind DNA
Different regions of DNA are packed differently

Question 6

Gene expression

Answer 6

process of translation and transcription
synthesis of a specific protein with a sequence of amino acids that encoded the gene