DNA, genes, chromosomes(Test #3- Nov.11)

Question 1

What does DNA stand for?

Answer 1

Deoxyribonucleic acid

Question 2

What is DNA shaped like?

Answer 2

It is shaped like a double helix

Question 3

What are the 4 kinds of Nitrogen bases?

Answer 3

• Adenine(A)
• Guanine(G)
• Thymine(T)
• Cytosine(C)

Question 4

Explain the DNA structure.

Answer 4

• Each step is made up of two bases that connect with
  each other in the middle.
• “A” bases only connect with “T” bases and “C” bases only connect with “G” bases.

Question 5

What is a gene?

Answer 5

A gene is a segment of DNA that determines a specific genetic characteristic.

Question 6

What are genes passes through?

Answer 6

Genes are passed through heredity. Heredity means that it’s passed down by the parents.

Question 7

Each DNA molecule in the nucleus of a cell is a chromosome.

True or false.

Answer 7

True.

Question 8

Explain cell division.

Answer 8

When cells divide, DNA coils up and forms a chromosome.

Question 9

The nucleus of each cell contains:

Answer 9

• 23 pairs of chromosomes for a total of 46 chromosomes

Question 10

There are ___ chromosomes that are similar for both men and women but the 23rd chromosome is a pair of sex chromosomes.

Answer 10

There are 22 chromosomes.

Question 11

How many X and Y chromosomes do men and women have?

Answer 11

Women only have 2 X chromosomes.

Men have an X chromosome and Y chromosome.