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

Genetic Code Answers

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Which characteristics describe the genetic code of humans? Select three options.can help in development of effective medicationscan only help understand human geneticscan help explain genetic diseasescomposed of about 19,000 genescomposed of 23 chromosomes

c
can help in development of effective medications
c
can only help understand human genetics
c
can help explain genetic diseases
c
composed of about 19,000 genes
c
composed of 23 chromosomes
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E
Each scientist made an important, but unrelated, contribution.
S
Scientists built on the previous work of other scientists to make new discoveries.
M
Most of the discoveries were made by chance and did not depend on prior knowledge.
T
The most important contributions were made within the same time period of the late 1800s.
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What causes the differences in physical characteristics like hair color among people?

d
different versions of genes
v
variations in DNA length
d
different numbers of chromosomes
v
variations in cell nucleus size
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D
DNA transforms from a nucleic acid into a protein, and RNA remains a nucleic acid.
R
RNA transforms from a nucleic acid into a protein, and DNA remains a nucleic acid.
D
DNA leaves the nucleus during the process and RNA remains in the nucleus.
R
RNA leaves the nucleus during the process and DNA remains in the nucleus.
5

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D
DNA folds into stacked layers called chromatin, which then squeeze into the nucleus.
D
DNA is double-stranded, so one strand is inside the nucleus and the other wraps around the nucleus.
D
DNA tightly coils around proteins and condenses into chromosomes, which fit in the nucleus.
D
DNA is naturally much smaller than the cell nucleus so it easily fits inside the nucleus.

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