Answers SY2025-26 - 2002070 MJ Comprehensive Science 2 Sem 1 CRUnit Test

Unit Test Answers

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Which best explains why meiosis is involved with sexual reproduction?

Meiosis makes zygotes, which are fused together in sexual reproduction.

Meiosis makes eggs and sperm, which are the cells that create offspring and allow for variation.

Meiosis replicates zygotes to form the egg and sperm in sexual reproduction.

Meiosis replicates the body cells after the zygote is formed in sexual reproduction.

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Which structure carries instructions for producing the proteins that help make a person’s hair curly?

phosphate

deoxyribose

lipid

gene

asexualbinaryartificialsexual

asexual

binary

artificial

sexual

Shira listed the steps for protein production in cells.1. A strand of RNA is made.2. RNA leaves the nucleus.3. RNA moves to the ribosome.4. A protein is made.

DNA unzips after step 1.

DNA unzips before step 1.

DNA is replicated after step 3.

DNA is replicated before step 3.

Which statement describes a similarity between asexual reproduction and sexual reproduction?

Both processes involve fertilization.

Both processes involve cell division.

Both processes produce genetically identical offspring.

Both processes require two parents.

In which stage does crossing over occur?

prophase I

metaphase I

prophase II

metaphase II

Chimpanzees reproduce sexually, and sponges reproduce asexually. What disadvantage do chimpanzees have compared to sponges?

Chimpanzees’ offspring have differences in their DNA.

Chimpanzees require less energy to make offspring.

Chimpanzees reproduce more slowly.

Chimpanzees’ offspring have to fight harder for resources.

Which nitrogen base sequence is the partner of T-C-A-G-C-A?

A-C-G-A-C-T

C-A-G-A-T-G

A-G-T-C-G-T

T-C-A-G-C-A

Which best explains what happens to the number chromosomes after meiosis I?

diploid to diploid

diploid to haploid

haploid to diploid

haploid to haploid

Which statement correctly compares metaphase I and metaphase II?

In metaphase II twice as many chromosomes line up along the middle of the cell as in metaphase I.

In metaphase I twice as many chromosomes line up along the middle of the cell as in metaphase II.

In metaphase II twice as many chromosomes are pulled to opposite ends of the cell as in metaphase I.

In metaphase I twice as many chromosomes are pulled to opposite ends of the cell as in metaphase II.

What was known before Franklin and Wilkins conducted their studies of DNA? Select three options.DNA is found in the nucleus of a cell. The human genetic code is made of 50,000 genes.Organisms store and transmit genetic information. DNA has a double-helix structure. Cells contain protein molecules.

DNA is found in the nucleus of a cell.

The human genetic code is made of 50,000 genes.

Organisms store and transmit genetic information.

DNA has a double-helix structure.

Cells contain protein molecules.

An offspring forms with genetic input from two parents. What can be known about the offspring?

It is an animal.

It was produced through sexual reproduction.

It is a bacterium.

It was produced through asexual reproduction.

How are the processes of asexual reproduction and sexual reproduction different? Select three options.In both processes, all offspring have identical DNA.They involve a different number of parents.Only one process involves sperm and eggs.Only one process involves meiosis.Only one process involves cell division.

In both processes, all offspring have identical DNA.

They involve a different number of parents.

Only one process involves sperm and eggs.

Only one process involves meiosis.

Only one process involves cell division.

Which substances compose the backbone of DNA?

sugars and lipids

phosphates and amino acids

sugars and phosphates

lipids and proteins

What is required for sexual reproduction to occur?

an individual that produces sperm and an individual that produces eggs

an individual that produces sperm and an individual that produces spores

an individual that produces buds and an individual that produces spores

an individual that produces buds and an individual that produces eggs

A species of asexually reproducing bacteria can have new offspring in 40 minutes, and a species of sexually reproducing salamanders can have new offspring in 48 months.Which statement best describes this situation?

This is a disadvantage for both species.

This is a disadvantage for the bacteria and an advantage for the salamanders.

This is an advantage for the bacteria and a disadvantage for the salamanders.

This is an advantage for both species.

Which best describes the storage of the genetic code?

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.

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.

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.

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.

E. coli is a species of bacteria. What advantage does E. coli have over sexually reproducing organisms?

The bacteria’s offspring have differences in their DNA.

The bacteria require less energy to make offspring.

The bacteria can reproduce more slowly.

The bacteria’s offspring have to fight for resources.

Which of the following are forms of asexual reproduction? Select three options.zygote formationbinary fissionfertilizationfragmentationsporulation

zygote formation

binary fission

fertilization

fragmentation

sporulation

Which best explains the zygote?

It has a diploid number of chromosomes.

It has a haploid number of chromosomes.

It has all the chromosomes of the mother.

It has all the chromosomes of the father.

The diagram shows a stage in meiosis.

metaphase I

anaphase I

metaphase II

anaphase II

Which best compares DNA and RNA with regard to the process of protein production?

DNA transforms from a nucleic acid into a protein, and RNA remains a nucleic acid.

RNA transforms from a nucleic acid into a protein, and DNA remains a nucleic acid.

DNA leaves the nucleus during the process and RNA remains in the nucleus.

RNA leaves the nucleus during the process and DNA remains in the nucleus.

The diagram shows genetic structures.

chromosome

protein

gene

DNA

A scientist is studying two types of worms. Worm X has DNA identical to its parent. Worm Y has a combination of DNA from two parents. The scientist determines that one of the worms has a survival advantage over the other worm.

Worm X reproduces asexually, which gives it genetic variation.

Worm Y reproduces sexually, which gives it genetic variation.

Worm Y reproduces asexually, which gives it more DNA.

Worm X reproduces sexually, which gives it more DNA.

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