This is part 2 of the questions i couldnt fit all of them on there lol.

11.
(03.05 mc)
why must cells be able to both transcribe and replicate their dna? (2 points)

the cell's dna must be transcribed before it can be replicated.

new cells can only be created after transcription has taken place.

transcription can be used when a cell is unable to replicate.

replication creates new dna, while transcription creates mrna.
12.
(03.05 mc)
while the dna in a human skin cell was being replicated, a single base was miscopied. what is the most likely result of this skin cell? (2 points)

all the proteins the cell creates from the miscopied strand will do different jobs than the old ones.

any miscopied dna will be replaced with an accurate dna copy once the cell divides.

both new dna strands will end up together in a new cell, and the inaccurate one will be discarded.

if the new sequence codes for the same amino acid as the original cell, it will function normally.
13.
(03.05 mc)
if a trna molecule has an anticodon that reads gcu, what was the codon of the mrna molecule? (2 points)

gcu

cga

cgt

uag
14.
(03.05 mc)
while mrna strands are being created a sequence is sometimes miscopied. what will be the effect of this on the cell? (2 points)

the damaged mrna may cause cell death.

translation may not take place.

future transcription will not take place.

ribosomes may be destroyed.
15.
(03.06 mc)
what is the main source that lead to increased genetic variation? (2 points)

selective breeding

gamete mutations

adaptation

genetic drift
16.
(03.06 mc)
using the chart, which of the following point mutations will cause the least harmful effect on an individual? (2 points)

u

c

a

g

uuu

phenylalanine

ucu

serine

uau

tyrosine

ugu

cysteine

u

u

uuc

phenylalanine

ucc

serine

uac

tyrosine

ugc

cysteine

c

uua

leucine

uca

serine

uaa

stop

uga

stop

a

uug

leucine

ucg

serine

uag

stop

ugg

tryptophan

g

cuu

leucine

ccu

proline

cau

hisitidine

cgu

arginine

u

c

cuc

leucine

ccc

proline

cac

hisitidine

cgc

arginine

c

cua

leucine

cca

proline

caa

glutamine

cga

arginine

a

cug

leucine

ccg

proline

cag

glutamine

cgg

arginine

g

auu

isoleucine

acu

threonine

aau

asparagine

agu

serine

u

a

auc

isoleucine

acc

threonine

aac

asparagine

agc

serine

c

aua

isoleucine

aca

threonine

aaa

lysine

aga

arginine

a

aug

methionine/start

acg

threonine

aag

lysine

agg

arginine

g

guu

valine

gcu

alanine

gau

aspartate

ggu

glycine

u

g

guc

valine

gcc

alanine

gac

aspartate

ggc

glycine

c

gua

valine

gca

alanine

gaa

glutamate

gga

glycine

a

gug

valine

gcg

alanine

gag

glutamate

ggg

glycine

g

a change from auu to acu

a change from ugu to uga

a change from cga to aga

a change from uua to cug
17.
(03.06 mc)
tobacco products have been identified as mutagens. however, some tobacco users develop cancer and some do not. the reason for this apparent inconsistency is (2 points)

mutagens only have the capability to cause mutations if exposure lasts over 20 years

some people are more predisposed to developing cancer when exposed to mutagens

not all tobacco products are cancerous

tobacco use only causes benign tumors that are identified as noncancerous
18.
(03.06 mc)
if a mutation occurs in a body cell and the mutation changes the phenotype of the individual, what will happen to the offspring of the individual? (2 points)

the offspring may or may not inherit the new phenotype.

the offspring will inherit neither the genotype nor the phenotype change.

the offspring will inherit the new phenotype.

the offspring will inherit the change in genotype but not the phenotype change.
19.
(03.07 mc)
recently, some crop plants were genetically modified to be immune to the effects of weed killers. which of the environmental concerns should be considered before planting the resistant crops? (2 points)

an increase in crop diversity.

a decrease in crop diversity.

an increase in crop yield.

a decrease in crop yield.
20.
(03.08 mc)
if a mother carries a recessive allele for a genetic disorder, such as cystic fibrosis, under what circumstances will her children inherit the disorder? (2 points)

the children's father must also carry the recessive allele

the mother's father must also carry the recessive allele

the paternal grandfather must also carry the recessive allele

the children must be female to inherit the disorder
21.
(03.08 mc)
why would water be a priority after a natural disaster when most victims have major problems, such as the loss of a home, to deal with? (2 points)

water sources can get contaminated and infect large groups of people.

water systems must be turned off during all disasters.

water is an easier problem to solve the crisis.

water is something most people forget about during a crisis.