Biology Test #4

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

A. A silent mutation

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

A. transcription; nucleus

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

B) 3' UGC 5'.

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

B) Community

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

B) The growth rate will approach zero.

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?

B) snakes, owls, corn

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

B. 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?"

B. Jean-Baptiste de Lamarck

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 brown- furred mice survived, and all of the black-furred and white-furred mice perished in the flood. What is this an example of?

B. the bottleneck effect

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.

B. transfer

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

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

C) 5' cap and poly (A) tail

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?

C) DNA in both daughter cells would be radioactive.

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

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

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

C) hydrogen

A population of ground squirrels has an annual per capita birth rate of 0.03 and an annual per capita death rate of 0.04. Calculate an estimate of the number of individuals added to (or lost from) a population of 1,000 individuals in one year.

D) 10 individuals lost

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?

D) 18

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

D) 5'AATGCCTG3'

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

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

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

D) Population

Which of the following processes does not occur within the nucleus?

D. translation

Which of the following best describes Chargaff's base-pair bonding rules?

E. Pyrimidines always bind to purines.

25) Natural selection is based on all of the following except _______

E. individuals adapt to their environments and, thereby, evolve.

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

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

Missense

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

Polypeptide

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

The nucleotide sequence of the template strand

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

a. Ligase

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

b. DNA polymerase

14. Unwinds the DNA double helix. _____

c. Helicase

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

the lagging 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