6.6

Question 1

negative regulation

Answer 1

repressor proteins inhibit transcription when they bind to operators

Question 2

negative inducible operon

Answer 2

normally off by presense of a repressor protein but can be activated by removal of the protein

Question 3

preventing transcription

Answer 3

negative repressor operon usually on but transcription can be inhibited by binding of a repressor protein

Question 4

non coding RNA regulation

Answer 4

microRNA, small interfering RNAs

Question 5

micro RNA

Answer 5

can degrade target RNA

Question 6

small interfering RNAs

Answer 6

degrades target RNA and condenses chromatin

Question 7

morphogenesis

Answer 7

gives organisms structure and shape

Question 8

maternal effect genes

Answer 8

establish axis

Question 9

homeotic genes

Answer 9

control pattern formation, segment specific body parts

Question 10

inductive signals

Answer 10

location in relation to other cells

Question 11

miRNAs

Answer 11

single stranded RNA molecules capable of binding to complementary sequences in mRNA molecules

Question 12

siRNAs

Answer 12

RNA interference, used to silence expression of selected genes

Question 13

induction

Answer 13

one group of embryonic cells influences development of another, usually by causing changes in gene expression

Question 14

determination

Answer 14

point at which an embryonic cell is irreversibly committed to a particular cell type

Question 15

pattern formation

Answer 15

spacial organization of tissues and organs

Question 16

maternal effect gene

Answer 16

when mutant in mother results in mutant phenotype in offspring regardless of offspring’s genotype