PLS170C1 Exam 2 Questions with Correct Answers
What constitutes an individual's genome? - Answer-all of its DNA
A particular protein is 400 amino acids long. How many nucleotides in the template strand of DNA are required to code for this protein? - Answer-1200
When examining the genetic cod...
PLS170C1 Exam 2 Questions with
Correct Answers
What constitutes an individual's genome? - Answer-all of its DNA
A particular protein is 400 amino acids long. How many nucleotides in the template
strand of DNA are required to code for this protein? - Answer-1200
When examining the genetic code, it is apparent that ____________________. -
Answer-There can be more than one codon for a particular amino acid
The relationship between a gene and a messenger RNA is as follows: - Answer-mRNAs
are made from genes.
Making a complementary copy of the genetic code in DNA by synthesis of RNA is called
________________________. - Answer-transcription
___________________ refers to converting the codons in RNA to an amino acid
sequence of a protein. - Answer-Translation
Which of the following is the correct RNA sequence for the DNA sequence
GCCATAAGT? - Answer-CGGUAUUCA
The anticodon is found on the ________________ which is essential for converting
codons on mRNA to an amino acid sequence of proteins. - Answer-tRNA
Heritable changes in the DNA of an organism are referred to as _____________. -
Answer-mutations
The original source of all genetic variation is ___________________. - Answer-mutation
What is meant by a paternal chromosome? - Answer-the member of a homologous pair
that was inherited from the father
Crossing over during prophase I of meiosis usually contributes to genetic variation by
exchanging chromosomal segments between _______________. - Answer-homologous
chromosome pairs
How many different combinations of maternal and paternal chromosomes can be
packaged in gametes made by an organism with a diploid chromosome number of 6 (2n
= 6)? - Answer-8
, Genetic variation, provided through sexual reproduction, offers more opportunity for
offspring to survive in changing environments. What two aspects of meiosis provide
sources of such variation? - Answer-crossing over and independent assortment of
chromosomes
What is genetic recombination? - Answer-the new combination of maternal and paternal
chromosome segments that result when homologs cross over
A farmer uses triazine herbicide to control pigweed in his field. For the first few years,
the triazine works well and almost all the pigweed dies; but after several years, the
farmer sees more and more pigweed. Which of these explanations best describes this
observation? - Answer-Only triazine-resistant weeds survived and reproduced, so each
year more pigweed was triazine-resistant.
Resistance to a wide variety of insecticides, fungicides, antibiotics, antiviral drugs, and
herbicides has recently evolved in hundreds of insects, fungi, bacteria, viruses, and
plants. Why? - Answer-Humans are altering the environments of these organisms, and
the organisms are evolving by natural selection.
________________ is defined as the tendency of organisms that have favorable
adaptations to their environment to survive to reproduce. - Answer-Natural selection
Which environmental influences are likely to have caused the evolution of
developmental changes in early primitive plant species? - Answer-Presence of
herbivores, Rainfall, Temperature
Which environmental influences are NOT likely to have caused the evolution of
developmental changes in early primitive plant species? - Answer-Chemicals released
by human pollution
Radioisotopes are often used to determine the time of death of fossilized remains.
Tritium has a half-life of 12.3 years. That means that 24.6 years after an organism dies
it will have _______ of the original radioactive tritium. - Answer-1/4
What types of plants would you NOT expect to see during a walk in a forest about 250
million years ago? - Answer-Flowering Plants
Evolution of species on Earth _____________________. - Answer-has occurred
throughout Earth's history and is still under way.
A gene pool consists of all the alleles ___________________. - Answer-present in a
specific population
Evolution occurs at the level of ________________________. - Answer-The Population
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Scholarsstudyguide. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.99. You're not tied to anything after your purchase.