EOC Missed Qs

Question 1

Lac operon type

Answer 1

Inducible: substrate dissociates repressor

Question 2

What is the normal and induced states of lac operon?

Answer 2

Normal: off
On: lactose present, binds as allolactose to repressor, repressor dissociates, operator is free and transcription of genes can occur

Question 3

Type of operon that TRP is

Answer 3

Repressible: substrate binds to repress or stop transcription

Question 4

Normal and ON for TRP operson

Answer 4

Normally: on, low levels of Trp > transcription occurring
Off: high levels of Trp, dimerize and bind to operator to repress transcription

Question 5

Where is the auditory cortex located?

Answer 5

Temporal lobe

Question 6

What is the I band?

Answer 6

Actin only

Question 7

What is the name of the Actin only section?

Answer 7

I band

Question 8

What is the overlap section of actin and myosin?

Answer 8

A band

Question 9

What is the A band showing?

Answer 9

Overlap of actin and mysoin

Question 10

What is the H band?

Answer 10

Myosin only

Question 11

What is the band with only myosin?

Answer 11

H band

Question 12

Function of the spleen?

Answer 12

Storage of leukocytes

Question 13

What is the classification of restriction enzyme?

Answer 13

Endonuclease: cleave nucleotides from the middle of segment

Vs exonuclease: cleaving end of chain

Question 14

DNA vs cDNA template length?

Answer 14

DNA is longer, cDNA is shorter

• cDNA developed from mRNA, only coding regions, no introns
• complimentary to mRNA

Question 15

Professional Antigen Presenting Cells (APCs)

Answer 15

MHC II: B cells, dendritic cells, macrophages

- lead to T-cell mediated immunity by presenting to adaptive system

Question 16

What does LH surge cause:

Answer 16

Ovulation

Question 17

Ependymal

Answer 17

Cerebrospinal

Question 18

Astrocyte =

Answer 18

Support cells

Question 19

Pluripotent

Answer 19

Not natural in adults

Question 20

Totipotent

Answer 20

Normally found in embryo only

Question 21

net filtration

Answer 21

Passing into bowmans capsule

Question 22

Protease formation and location

Is it found in the saliva?

Answer 22

Not found in saliva

Chief cells in stomach secrete pepsinogen: cleaved to active pepsin (protease in gastric juice) with lowering of pH

Question 23

Development of secondary oocyte

Answer 23

Female birth: primary oocytes and halted in prophase I
Puberty: meiosis I completed, primary oocytes halted in metaphase II
Fertilization: primary oocytes complete meiosis II and become haploid secondary oocytes

Question 24

Embryo development stages

Answer 24

Morula (need moreee) > blastula (blast off) > gestural > neuralation

Question 25

HcG mimics what other hormone

Answer 25

Mimics LH: to maintain corpus luteum

Question 26

What is the slope of lineweaver-Burke plot?

Answer 26

Km / Vmax