QUESTION 13 Bacteria reproduce by the process of cell division. This kind of reproduction is referred to as

a. asexual

b. agamic

c. unsexual

d. sexual 2 points

QUESTION 14 Scientists cannot agree on whether viruses are living or not because

a. they can reproduce but do not require any utilization of energy to do so

b. they can only reproduce within a host cell and not independently

c. under certain conditions they can reproduce, but they do not contain any DNA

d. they are much smaller than other simple living organisms

QUESTION 15 What is the main factor that drives Darwinian evolution?

a. the size of an organism

b. the need to have sex

c. the competition for finite resources

d. the ability of an organism to harness the energy of the Sun

QUESTION 16 The fact that all cells used in life on Earth are based on the same biochemistry suggests that

a. life originated from a variety of sources

b. all life on Earth shares a common ancestor

c. the biochemistry of life on Earth is universal

d. life on Earth was created by some omnipotent being

QUESTION 17 Which is the MOST important property of the element carbon that makes it ideal as a fundamental building block of biological molecules?

a. it readily forms chemical bonds with itself and other elements, allowing a wide variety of complex molecules to form

b. it is a common element

c. it is a very stable element

d. it is the only element capable of bonding to itself

QUESTION 18 The basic molecular building blocks of DNA and RNA are

a. nucleotides

b. monosaccharides

c. amino acids

d. adenosine triphosphate molecules

QUESTION 19 In the scientific method, natural selection is classified as a

a. model

b. principle

c. theory

d. hypothesis

QUESTION 20 Chemists refer to molecules containing carbon atoms as

a. inorganic

b. organic

c. carbonic

d. carbonaceous