AnswersSY2025-26 - 2002070 MJ Comprehensive Science 2 Sem 1 CRMeiosis

Meiosis — Unit test Answers

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1
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Before DNA was discovered, in which materials did scientists think the genetic material was stored?

A
proteins
B
carbohydrates
C
nucleic acids
D
lipids
2
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Which best describes the storage of the genetic code?

A
A gene is a segment of DNA, a condensed DNA molecule makes up a chromosome, a chromosome is inside a nucleus, and a nucleus is contained within a cell.
B
A DNA molecule is a segment of a gene, a gene makes up a chromosome, a chromosome is inside a cell, and a cell is contained within a nucleus.
C
A gene is a segment of a chromosome, a condensed chromosome makes up a DNA molecule, a DNA molecule is inside a nucleus, and a nucleus is contained within a cell.
D
A DNA molecule is a segment of a chromosome, a chromosome makes up a gene, a gene is inside a cell, and a cell is contained within a nucleus.
3

Which important property of DNA did Friedrich Miescher discover?

A
It is made partly of sugar molecules.
B
It has a double-helix structure.
C
It is three-dimensional.
D
It is found in the nucleus of a cell.
4

What are the building blocks of proteins?

A
amino acids
B
ribosomes
C
tRNA molecules
D
chromosomes
5

The diagram shows genetic structures.

Question illustration
A
chromosome
B
protein
C
gene
D
DNA
6

Which scientist discovered DNA after experimenting with white blood cells?

A
Watson
B
Franklin
C
Miescher
D
Wilkins
7

Which best summarizes the scientific process that led to our current understanding of DNA?

A
Each scientist made an important, but unrelated, contribution.
B
Scientists built on the previous work of other scientists to make new discoveries.
C
Most of the discoveries were made by chance and did not depend on prior knowledge.
D
The most important contributions were made within the same time period of the late 1800s.
8

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

A
can help in development of effective medications
B
can only help understand human genetics
C
can help explain genetic diseases
D
composed of about 19,000 genes
E
composed of 23 chromosomes
9

What is the twisted ladder shape of the DNA called?

A
3-D model
B
nucleotides
C
double helix
D
single strand
10

a proteina ribosomeDNARNA

A
a protein
B
a ribosome
C
DNA
D
RNA

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Meiosis — Unit test Answers — SY2025-26 …