biology unit 1

Question 1

DNA consists of 2
strand of repeating
units called ?

Answer 1

nucleotides.

Question 2

Nucleotides are made
of ?

Answer 2

phosphate,
deoxyribose sugar
and a base.

Question 3

Adenine pairs with ?

Answer 3

thymine

Question 4

Guanine pairs with ?

Answer 4

cytosine

Question 5

The phosphate of one
nucleotide is attached by a
(1) bond to the
(2) of the
next.

Answer 5

1. strong chemical
2. deoxyribose sugar

Question 6

what bonds form
between the bases?

Answer 6

Hydrogen bonds

Question 7

when hydrogen bonds form between bases what is formed ?

Answer 7

This joins the two
strands of DNA –
forming the double
helix.

Question 8

The two strands of
DNA run in (1)
directions. They are
(2)

Answer 8

1. opposite
2. antiparallel.

Question 9

The 3’ strand ends
on what type of sugar

Answer 9

a deoxyribose
sugar.

Question 10

The 5’ strand ends
on what type of group

Answer 10

a phosphate
group.

Question 11

what do all cells have ?

Answer 11

• cell membrane
• nucules
• cytoplasm
• mitrchondria

Question 12

what are Prokaryotes?

Answer 12

bacteria

Question 13

what are Eukaryotes ?

Answer 13

animals,
plants or fungi.

Question 14

Prokaryotes unicellular or
multicellular?

Answer 14

unicellular

Question 15

are Eukaryotes unicellular or
multicellular?

Answer 15

either unicellular or
multicellular

Question 16

3 facts about Prokaryotes

Answer 16

• Do not have a
  membrane bound
  nucleus.
• They have a large
  circular chromosome
  and small rings of DNA
  called plasmids.
• DNA is supercoiled.

Question 17

3 facts about Eukaryotes

Answer 17

Have a membrane
bound nucleus.

Have linear
chromosomes.

Have circular
chromosomes present
in chloroplasts and
mitochondria.