Biology chapter 4

Question 1

What is a chromosome?

Answer 1

threadlike structures found in a nucleus of a cell.

Question 2

What is a gene?

Answer 2

Codes for a particular sequence of amino acids, to make a specific protein.

Question 3

Chromosome can only be visible when?

Answer 3

Their dividing or stained with a special dye.

Question 4

What is a DNA?

Answer 4

a chemical molecule with a double helix structure.

Question 5

What does a DNA do?

Answer 5

determines what the cells does, contains a complete set of instructions to make a functioning cell.

Determines the characteristics of a living organism.

Passed on from the parents to their child/offspring during fertilization.

Question 6

What is a gamete?

Answer 6

A sex cell, sperm and egg cell are called gametes.

Question 7

What is fertilization?

Answer 7

The joining of a sperm cell with an egg cell is called fertilization.

Question 8

What is a Variation?

Answer 8

the differences between living things of the same species is called a variation.

Question 9

What is a species?

Answer 9

A group of similar organisms that can breed with one another to produce fertile offspring.

Question 10

What are the two types of variations?

Answer 10

Continuous and Discontinuous.

Question 11

What is the name given to the process that causes a characteristic in a population to become more common over time?

Answer 11

Natural selection.

Question 12

Write down the word that describes the total number of individuals of the same species.

Answer 12

Population

Question 13

What are chromosomes made of?

Answer 13

DNA

Question 14

What term describes the differences that occur within the same species?

Answer 14

varaiation.

Question 15

two carbon compounds found in living organisms

Answer 15

lipids and carbohydrate

Question 16

three effects of climate change

Answer 16

less predictable rainfall
rise in sea level
Tsunami

Question 17

what does a renal artery do?

Answer 17

Unfiltered blood enters the ren artery first.

Question 18

What does kidney do?

Answer 18

filters the blood.

Question 19

what does the ureter do?

Answer 19

urine flows to the bladder by this tube.

Question 20

What does a bladder do?

Answer 20

urine is stored here before excretion from the body.

Question 21

what does the urethra do?

Answer 21

urine flos out of the bladder to the outside world.

Question 22

Vitamin A

Answer 22

pigment in the retina for vision

Question 23

Iron

Answer 23

to make haemaglobin

Question 24

Carbohydrate

Answer 24

supplies energy

Question 25

Vitamin D

Answer 25

Helps the body to absorb calcium and so needed for strong bones and teeth

Question 26

Calcium

Answer 26

to grow strong bones and teeth

Question 27

Protein

Answer 27

for growth and new cell production

Question 28

Vitamin C

Answer 28

For strong skin and blood vessels for both the mother and the fetus.

Question 29

Two substances that the fetus excretes, which are removes by the mother’s blood

Answer 29

urea
carbon dioxide