BIO Exam 4

Cytosine makes up 32% of the nucleotides in a sample of DNA from an organism. Approximately what percentage of the nucleotides in this sample will be thymine?

18

A particular triplet of bases in the template strand of DNA is 5'ACG3'. The corresponding codon for the mRNA transcribed is ________.

3' UGC 5'.

During RNA Processing, which of the following are added to help(s) to stabilize mRNA by inhibiting its degradation?

5' cap and poly (A) tail

A DNA template strand reads 3'TTACGGAC5'. During DNA Replication, what specific complementary DNA sequence will be added to the growing new strand?

5'AATGCCTG3'

Which one of the following point mutations is most likely to have no effect on the final protein product?

A silent mutation

In the figure above, if "x" indicates the location of two closely related species, then fossils of their most recent common ancestor are most likely found in which strata?

C

Group of different species, living in the same local area, and can interacting with one another is a _________________.

Community

Suppose you are provided with an actively dividing culture of E. coli bacteria to which radioactive thymine has been added. What would happen if a cell replicates once in the presence of this radioactive base?

DNA in both daughter cells would be radioactive.

Adds DNA nucleotides at the 3' end using a DNA template strand to pair complementary bases.

DNA polymerase

A new DNA strand elongates only in the 5' to 3' direction because

DNA polymerase can only add nucleotides to the free 3' end.

A "J-shaped" growth curve indicates _______________.

Exponential growth

For the following mRNA strand, indicate the correct polypeptide sequence that will be produced: 3'GCAUCAGCAAGG5.' (The Codon Table is on the last page of your exam.)

GLY - THR - THR - THR

Unwinds the DNA double helix.

Helicase

In translation, what is the function of the release factor (RF)?

It binds to the stop codon in the A site in place of a tRNA.

What effect will the mutation described in Question #19 have on the polypeptide strand that is synthesized from it?

It will change an amino acid. The amino acid "Asp" will be changed to "Glu."

Characteristics that an organism acquires during their lifetime are NOT normally inherited by offspring. Which of the following scientists came up with the idea of "inheritance of acquired characteristics?"

Jean-Baptiste de Lamarck

Repairs any breaks in the sugar-phosphate backbone; joins okazaki fragments.

Ligase

A point mutation occurs, changing the DNA template strand from 3'CTG5' to 3'CTC5'. What type of mutation is this?

Missense

A group of individuals of the same species that live in the same local area and can interbreed to produce fertile offspring is a _________________.

Population

Complete the sentence with the MOST CORRECT answer. One gene codes for one ____________.

Protein or Polypeptide

As N approaches K for a certain population, which of the following is predicted by the logistic equation?

The growth rate will approach zero

What kind of chemical bond is found between paired bases of the DNA double helix?

hydrogen

Natural selection is based on all of the following except _______

individuals adapt to their environments and, thereby, evolve.

A group of mice live in a corn field. Which of the following is a CORRECT list of biotic factors that can impact this mice population?

snakes, owls, corn

A large population of field mice is decimated by the flooding of their habitat. Over 90% of the mice die in the flood. Now, only a few mice are left. By chance, only brownfurred mice survived, and all of the black-furred and white-furred mice perished in the flood. What is this an example of?

the bottleneck effect

During DNA Replication, the DNA strand that is synthesized as short Okazaki fragment is called the ______________.

the lagging strand

Carrying capacity is _______________.

the maximum population size that a particular environment can support.

What determines the nucleotide sequence of the newly synthesized strand during DNA replication?

the nucleotide sequence of the template strand

DNA replication is called semiconservative because

the two resulting DNA molecules each have one new DNA strand and one old strand from the original DNA molecule.

An RNA copy of the DNA template strand is made. This describes the process of ____________, which takes place in the ______________.

transcription; nucleus

The type of RNA that brings the correct amino acid to the ribosome so it can be added to the growing polypeptide chain is _____________ RNA.

transfer

Which of the following processes does not occur within the nucleus? A. intron removal B. DNA replication C. transcription D. translation E. RNA processing

translation