AnswersCV Q4 MJ Science 3 Adv 2002110 Compacted Review of Grade.7.Life for SSA PrepDNA Mutations

DNA Mutations Answers

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1
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A mutation causes a dog to be born with a tail that is shorter than normal. Which best describes this mutation?

A
It is harmful because it obviously affects the dog’s survival.
B
It is harmful because it affects the dog’s physical appearance.
C
It is neutral because it does not obviously affect the dog’s survival.
D
It is beneficial because it affects the dog’s physical appearance.
2
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cellsribosomesamino acids

A
cells
B
ribosomes
C
amino acids
3

a positivea negativean aggressivea neutral

A
a positive
B
a negative
C
an aggressive
D
a neutral
4

Why can't organisms control genetic mutations?

A
because mutations only happen in laboratories
B
because mutations are random, unplanned changes
C
because mutations are usually harmful to organisms
D
because mutations are controlled by organisms' environment
5

lactose intolerancecancerlow blood oxygendiabetes

A
lactose intolerance
B
cancer
C
low blood oxygen
D
diabetes
6

Which is most likely caused by a genetic mutation?

A
A kitten is born with blue eyes.
B
A kitten is born with sharp claws.
C
A kitten is born with six toes on one foot.
D
A kitten is born with a short tail that grows longer.
7

Which is the best example of a genetic mutation in plants?

A
a plant's leaves turn green after being watered
B
a plant develops resistance to a new disease
C
a plant grows taller after being potted in a bigger container
D
a plant displays the same flower color as its parents
8

colortextureshapeflavor

A
color
B
texture
C
shape
D
flavor
9

Which best summarizes the effects of mutations on organisms?

A
Mutations are sometimes helpful, sometimes harmful, and sometimes neutral.
B
Mutations are usually harmful, sometimes neutral, and never helpful.
C
Mutations are sometimes neutral, sometimes helpful, and never harmful.
D
Mutations are always harmful, never helpful, and never neutral.
10

When will a genetic mutation most likely occur in an organism?

A
when a new trait has a neutral effect on the organism
B
when the organism is taking antibiotics
C
when a strand of RNA is copying a strand of DNA
D
when an organism is breaking down amino acids

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