All Questions page - 582

Which of the following statements is true regarding ribosomes?

a. They are composed of two separate units, each made of rRNA combined with protein.

b. They are used to translate the mRNA sequence into a protein composed of amino acids.

c. They have three different tRNA binding sites

d. all of the above

e. a and b only

A typical eukaryote protein might be ____ amino acids long and could be produced in less than _____ in translation.

a. 50 ... 5 minutes

b. 50,000 ... 5 hours

c. 5 ... 5 seconds

d. 400 ... 2 minutes

e. 4,000 ... 4 minutes

A typical eukaryote protein might be ____ amino acids long and could be produced in less than _____ in translation.

a. 50 ... 5 minutes

b. 50,000 ... 5 hours

c. 5 ... 5 seconds

d. 400 ... 2 minutes

e. 4,000 ... 4 minutes

In one form of genetic regulation, proteins called transcription factors bind to _____, thus facilitating the work of _____.

a. ribosomes ... transfer RNA

b. messenger RNA ... ribosomes

c. non-coding DNA sequences ... RNA polymerase

d. coding DNA sequences ... RNA polymerase

e. transfer RNA ... ribosomes

An intron is a sequence of ____ RNA that is ____ a primary transcript, while an exon is a sequence of ______ RNA that is ______ a primary transcript.

a. non-coding ... cut out of ... coding ... left in

b. transfer ... cut out of ... non-coding ... left in

c. coding ... left in ... non-coding ... cut out of

d. transfer ... left in ... transfer ... cut out of

e. non-coding ... left in ... coding ... left in

In DNA replication, both of the strands of the double helix serve as templates for _______.

The _______ are a group of enzymes that add nucleotides to a replicating DNA chain.

A permanent alteration in a DNA base sequence is known as a _________.

James Watson and Francis Crick discovered the _______.

The key to DNA replication is that each _______ base on an original strand of DNA serves as a template for the addition of a T base on the new strand, while each _______ on the original strand serves as a template for the addition of a G base.

A particular sequence of DNA _______ can specify a particular _______.

Given the following DNA sequence, determine the complementary strand that would be added in replication:

ATTGCATGATAGCC

James Watson and Francis Crick:

a. proved that DNA contains information for the production of proteins.

b. elucidated the nature of genetic mutations.

c. discovered DNA.

d. proved that chromosomes were made partly of DNA.

e. discovered the structure of DNA.

Would you expect cancer to arise more often in types of cells that divide frequently (such as skin cells) or in types of cells that divide rarely or not at all (such as nerve cells in the brain)? Explain your reasoning.

The type of biological study that was exemplified through the discovery of DNA structure is called:

a. detailed biology.

b. component biology.

c. microscopic biology.

d. elemental biology.

e. molecular biology

If dark matter did not exist it is likely that:
A. the universe would expand forever
B. the universe would begin contracting soon
C. the night sky would be brighter
D. the night sky would be darker
E. we would be able to see the center of the universe