Gen. Biology Test 2
25
A new form of life is discovered. It has a gentic code much like that of organisms on Earth except that there are five different DNA bases instead of four and the base sequences are translated as doublets instead of triplets. How many different amino acids could be accomodated by this gentic code?
UCA
A particular triplet of bases in the coding sequence of DNA is AGT. The corresponding codon for the mRNA transcribed is
Carbon dioxide is incorporated into PGA
All of the events listed below occur in the energy-capturing light reactions of photosynthesis except
DNA
All of the following are directly involved in translation except...
Production of identical daughter cells
All of the following are functions of meiosis in plants except
Adding electrons and protons to oxygen to form water
All of the following are functions of the Krebs cycle except
The mitituc spindles in prokaryotic cells are composed of microtubules
All of the following statements are true except
the synthesis of ATP
Assume a thylakoid is somehow punctured so that the interior of the thylakoid is no longer seperated from the stroma. This damage will have the most direct effect on which of the following process
Fix CO2 into organis acids during the night
CAM plants can keep stomates closed in daytime, thus reducing loss of water. They can do this because they
Acetic acid or acetyl CoA
Catabolism of proteins, lipids, and carbs can result in a 2-carbon molecule that enters the Krebs cycle. What is the molecule?
Molecular oxygen
During Oxidative phosphorylation, H2O is formed. Where do the oxygen atoms in the H2O come from?
Chain terminator codons occur
During translation, chain elongation continues until what happens?
6
Each time a molecule of glucose is completely oxidized via aerobic respiration, how many oxygen (O2) molecules are required?
phenylalanine
If the triplet UUU codes for the amino acid phenylalanine in bacteria, then in plants UUU should code for
zygotes
In animals, meiosis results in gametes, and fertilization results in
Construct simple sugars from carbon dioxide
In green plants, the primary function of Calvin Cycle is to
To harvest photons and transfer light energy to the reaction-center chlorophyll
In the thylakoid membranes, what is the main role of the antenna pigment molecules?
Krebs cycle > NADH+H > electron transport chain > oxygen
Inside an active mitochondrion, most electrons follow which pathway?
Lactate/NAD
Muscle cells in oxygen deprivation convert pyruvate to ________ and in this step gain _______.
excision of introns
Once transcribed, eukaryotic mRNA typically undergoes substantail alteration that includes
Contains ribose as its sugar and uracil instead of thymine
RNA differs from DNA in that RNA
substrate-level phosphorylation
The ATP made during fermentation is generated by which of the following?
green
The color of light LEAST effective in driving photosynthesis is
accepting electrons at the end of the electron transport chain
The oxygen consumed during cellular resperation is directly involved in
This pigment is best at absorbing light with a wavelength of 70 nm
The reaction-center chlorophyll of photosystems I is known as P700 because
Exons
What are the coding segments of a stretch of eukaryotic DNA called?
mRNA
What is the transcript of eukaryotic genes which is exported from the nucleus?
An agent that closely mimics the structure of glucose but is not metabolized
What kind of metabolic poison would most directly interfere with glycolysis?
stroma of the chloroplast
Where does the Calvin cycle of photosynthesis take place?
ATP and NADPH+H
Which of the following are products of the light reactions of photosynthesis that are utilized in the Calivin cycle?
Photosynthesis stores energy in complex organic molecules, while resperation releases it
Which of the following statements best describes the relationship between photosynthesis and respiration
The light reactions provide ATP and NADPH+H to the Calvin Cycle, and the cycle returns ADP, Pj, and NADP to the light reactions
Which of the following statements best represents the relationships between the light reactions and the Calvin cycle?
The P680 chloropyll donates a pair of protons to NADPH+H, which is thus converted to NADP
Which of the following statements regarding events in the functioning of photosystem II is false?
They use PEP carboxylase to initally fix C3 plant
Why are C4 plants able to photosynthesize more efficently than a C3 plant?
Karyotype
a display of homologous chromosomes of a cell organized in relation to their number, size and type