Question

5. Urokinase and chymotrypsin ( a digestive enzymes) have one domain in common with each other. This suggests that

a. they eveolve through exon shuffling

b. they are part of a gene family

c. they perform similar functions

9. which of the following point mutations would have little or no effect on cellular function?

a. mutation from AUA to AUG

b. mutation in regulatory region

c. mutation from CUC to AUU

d. mutation from UUA to UUG

e. mutation in exon

f. mutation in introns

10. scientists have estimated mutation rates by studying mutatant E.coli that are His-. Which of the following is (are) NOT true about the experiment involving His- E. coli?

a. His- mutants requires histidine in the media

b.His- mutants can not tolerate histidine

c. His- mutants spontaneously revert back to His+

d. His- mutants can not digest histidine

11. The National Toxicology Program report in 2016 that cell phone radiation increased brain tumor growth in male rats. Radiation can cause damage and mutations to DNA. Suppose you wished to study this further. You mate these rats and find that the offsprings have normal incidence of tumors. You would conclude that the tumors were most likely due to.

a. changes to somatic cells

b. changes in germ cells

c. changes to gonadal cells

If on the other hand the offspring also had increase tumor growth then you would conclude that the

a. tumor cells were passed down to offsprings

b. changes occur in stem cells

c. changes occur in germ cells

cell phones emit................ raditation when talking than on standby.

a. more

b. less

That would suggest that using a hands-free headset may be beneficial in preventing brain tumors. Ironically if the phone is kept in the pocket during a call using a headset then the genetic changes would be

a. prevented

b. more likely to pass to the next generation

c. less severe

Answer 1

9. Mutation in introns may have little or no effect on cellular function. Because, from AUA to AUG will replace isoleucine with metheonine. Mutation at regulatory region will cause total loss of control on gene expression. Mutation from CUC to AUUwill replace leucine with isoleucine. mutation from UUA to UUG will replace a stop codon wil isoleucine. mutation in exon may interrupt the translation. So mutation in intron may have little effect

10. scientists have estimated mutation rates by studying mutatant E.coli that are His-. Which of the following is (are) NOT true about the experiment involving His- E. coli? b.His- mutants can not tolerate histidine; d. His- mutants can not digest histidine.

His - mutants can not synthesize histidine, i.e why they need histidine in media.

11. The National Toxicology Program report in 2016 that cell phone radiation increased brain tumor growth in male rats. Radiation can cause damage and mutations to DNA. Suppose you wished to study this further. You mate these rats and find that the offspring have normal incidence of tumors. You would conclude that the tumors were most likely due to. a. changes to somatic cells. because if the changes happened in the germ cells, then offspring would have high incidence of tumor.

If on the other hand the offspring also had increase tumor growth then you would conclude that the

c. changes occur in germ cells.

because tumor cells can not be passed from parent to offspring. change in stem cell can only produce tumor in that particular child, not other offspring. only changes in germ cell can induce tumor in offspring.

cell phones emit....MORE.... raditation when talking than on standby.

That would suggest that using a hands-free headset may be beneficial in preventing brain tumors. Ironically if the phone is kept in the pocket during a call using a headset then the genetic changes would be c. less severe.

A wired headset transmits radiation through the wire , but it is a very low level radiation.