Question 1

Which of the following female organisms do NOT contain XX chromosomes?

Accepted Answer

Butterflies have a different sex-determination system called the ZW system, where females are ZW and males are ZZ.

Question 2

The connection point of two sister chromatids is called the

Accepted Answer

The connection point of two sister chromatids is called the centromere, which is where the kinetochore (protein structure) attaches during cell division.

Question 3

In some species,the sex of the future individual is decided by environmental conditions and not by sex chromosomes.In which of the following species is sex decided by temperature?

Accepted Answer

In frogs, the sex of the future individual is determined by environmental conditions, specifically by the temperature at which the eggs are incubated. This phenomenon is known as temperature-dependent sex determination. In other species listed, sex is determined by the presence of specific sex chromosomes.

Question 4

Which of the following has occurred in cloned animals?

Accepted Answer

All of the listed health problems have occurred in cloned animals at some point. Cloned animals have a higher risk of genetic abnormalities and health issues due to errors in the cloning process.

Question 5

Before a cell divides it must ____ its genetic information.

Accepted Answer

Before a cell divides, it must duplicate its genetic information to ensure that each new cell receives a complete set of genetic material.

Question 6

A eukaryotic chromosome consists of

Accepted Answer

A eukaryotic chromosome consists of DNA and proteins. DNA is wrapped around histone proteins to form nucleosomes, and these nucleosomes themselves are further coiled and folded to form the overall chromosome structure.

Question 7

Body cells of human males contain

Accepted Answer

Human males have one X chromosome and one Y chromosome in each of their body cells. This XY chromosome combination determines their male physical characteristics.

Question 8

How many clones of Trakr,the Ground Zero hero dog,were delivered to his owner in July 2009?

Accepted Answer

Five clones of Trakr were delivered to his owner in July 2009.

Question 9

Which of the following male organisms do NOT contain XY chromosomes?

Accepted Answer

Moths are the only male organisms listed that do not contain XY chromosomes. Instead, they have a ZW sex-determination system, where males are ZW and females are ZZ.

Question 10

Body cells of human females contain

Accepted Answer

Body cells of human females contain two X chromosomes, while males contain one X and one Y chromosome.

Question 11

After DNA replication,each chromosome contains

Accepted Answer

DNA replication results in the formation of two identical copies of the chromosome, which are called sister chromatids. These chromatids are connected at a region known as the centromere. Therefore, after DNA replication, each chromosome contains two sister chromatids. Choices B, C, D, and E are incorrect because they do not accurately describe the result of DNA replication on chromosomes.

Question 12

What is the success rate for producing live births of cloned animals?

Accepted Answer

The success rate for producing live births of cloned animals is generally low, with only about 1-2% of attempts resulting in a live birth. While there have been reports of higher success rates in certain species or with specific techniques, overall the success rate remains relatively low.

Question 13

Which of the following statements is INCORRECT about eukaryotic chromosomes?

Accepted Answer

Different eukaryotic species may have different systems of autosomes and sex chromosomes. For example, humans have 22 pairs of autosomes and 1 pair of sex chromosomes (XX for females and XY for males), while fruit flies have 3 pairs of autosomes and 1 pair of sex chromosomes (XX for females and XY for males).

Question 14

What is the basic problem with cloning adult animals?

Accepted Answer

Reprogramming the DNA is a significant challenge because adult cells have specialized and their DNA needs to be reset to an embryonic state for successful cloning.

Question 15

Butterflies are diploid organisms.In these animals,the sex of an individual is determined by Z and W chromosomes.Use this information to answer the following question(s).
-Which chromosomes are carried by a normal male butterfly?

Accepted Answer

The answer of Butterflies are diploid organisms.In these animals,the sex...

Question 16

Which of the following statements is NOT correct about autosomes?

Accepted Answer

Autosomes do not determine the sex of an individual in birds, moths, and butterflies. Sex chromosomes, such as Z and W in birds and X and Y in mammals, determine the sex in these organisms.

Question 17

What is the number of chromosomes found in an oak tree?

Accepted Answer

Most species of oak trees have 12 chromosomes in each cell.

Question 18

A diploid organism

Accepted Answer

A diploid organism contains two of each type of chromosome, one inherited from each parent. This results in a total of 46 chromosomes in human diploid cells (23 pairs). Choice A is incorrect because a diploid organism does not contain several copies of the same chromosome, as that would make it polyploid. Choice B is incorrect because a diploid organism contains both autosomes and sex chromosomes. Choice C is incorrect because a diploid organism contains two copies of each chromosome. Choice D is incorrect because diploid organisms have chromosomes that vary in size.

Question 19

Which of the following male organisms contain two identical sex chromosomes?

Accepted Answer

Birds are the only organisms in the options that have ZZ sex chromosomes, meaning they have two identical sex chromosomes. Turtles, chimpanzees, dogs, and lizards all have heteromorphic sex chromosomes (XY or WZ).

Question 20

What was the first animal cloned from an adult cell?

Accepted Answer

The first animal cloned from an adult cell was Dolly the sheep, who was born in 1996 through the process of somatic cell nuclear transfer.

Quiz 6: DNA Structure and Function