Biol 1201 Exam 2
How many CO2 molecules are released by a single acetyl-CoA molecule during aerobic respiration?
2
In DNA replication, ________ links two pieces of DNA together.
DNA ligase
When a neutrophil cell chases down and engulfs a bacterium, what type of transport is occurring?
phagocytosis
How many CO2 molecules are produced when one glucose molecule is completely utilized in the process of alcohol fermentation?
2
One strand of DNA has the sequence: A-C-C-T-C-C-G-G. The sequence of the complimentary strand is
C-C-G-G-A-G-G-T
A molecule that binds to the active site of an enzyme, inhibiting that enzyme is called _______.
a competitive inhibitor
In plants, how many CO2 molecules are needed to make one sucrose molecule?
12
Cytosine makes up 38% of the nucleotides in a sample of DNA from an organism. Approximately what percentage of the nucleotides in this sample will be thymine?
12%
How many CO2 molecules are produced when one glucose molecule is completely utilized in the process of aerobic respiration?
6
In trying to determine whether DNA or protein is the genetic material, Hershey and Chase made use of which of the following facts?
DNA does not contain sulfur, whereas protein does DNA contains phosphorus, but protein does not
The primary role of oxygen in cellular respiration is to
act as an acceptor for electrons and hydrogen, forming water
A molecule becomes more reduced when it _______.
gains an electron
In DNA replication, ________ separates the two DNA strands to unwind them.
helicase
What types of fermentation can the brain form?
the brain cannot do any fermentation
According to the fluid mosaic model of cell membranes, which of the following is a true statement about membrane phospholipids?
they can move laterally along the plane of the membrane
Assume that you have given a bacterial cell radioactive thymidine so that the DNA in the cell was completely labeled. Also assume that no other component of the cell is labeled. Now you take away the radioactive thymidine and allow the cells to divide. Remember the old DNA is still radioactive. After one cell division, which cells are radioactive?
both cells will be radioactive
You have a yeast strain that has a defect in the Krebs Cycle. Under what conditions, if any, could that yeast grow?
It can grow by alcohol fermentation
Four marathon runners are at the 20 mile mark. Two of the runners have had to stop. The other two runners are running at the same rate. The physiological conditions of these runners are given below. A) Runner A has low glucose levels in his muscles but his muscles are well oxygenated B) Runner B has low glucose levels in his muscles and his muscles are anaerobic C) Runner C has normal blood glucose levels in his muscles and his muscles are well oxygenated D) Runner D has normal blood glucose levels in his muscles are anaerobic Which runner would you say has the best chance of winning the race?
Runner C
Four marathon runners are at the 20 mile mark. Two of the runners have had to stop. The other two runners are running at the same rate. The physiological conditions of these runners are given below. A) Runner A has low glucose levels in his muscles but his muscles are well oxygenated B) Runner B has low glucose levels in his muscles and his muscles are anaerobic C) Runner C has normal blood glucose levels in his muscles and his muscles are well oxygenated D) Runner D has normal blood glucose levels in his muscles are anaerobic Assuming they are all running at the same speed and have the same weight, is runner C or runner D using glucose at the fastest rate?
Runner D
Which term most precisely describes the cellular process of breaking down large molecules into smaller ones?
catabolism
Which of the following statements regarding enzymes is true?
enzymes increase the rate of a reaction
If glucose entering the cell from the blood goes through the GLUT2 carrier protein and goes from a high to low concentration, what type of transport is occurring?
facilitated diffusion
Which of the following statements is correct about diffusion?
it is a passive process in which molecules move from a region of higher concentration to a region of lower concentration
You accidentally leave your favorite house/dorm plant in the dark over Thanksgiving vacation. To your surprise it is still alive when you return because ______.
it obtained energy from stored sugar and starch molecules produced before your vacation
You have a friend that recently lost 15 pounds. What happened to the mass of the fat that was lost?
it was released as CO2 and H2O
Where is the photosynthetic electron transport chain located?
membrane of the chloroplast
In his transformation experiments, Griffith observed that _______.
mixing a heat-killed pathogenic strain of bacteria with a living nonpathogenic strain can convert some of the living cells into the pathogenic form
Carbon dioxide is released during which of the following stages of cellular respiration?
oxidation of pyruvate to acetyl-CoA and the citric acid cycle
What type of photosynthesis is done by Spanish moss?
CAM type photosynthesis
In DNA replication, _______ removes the RNA primer and replaces with DNA
DNA polymerase I
All of the following occur during the Krebs Cycle
production of ATP, NADH, FADH2, release of carbon dioxide
Placed in a hypotonic solution, an animal cell will most likely
enlarge and perhaps rupture
Where is the Calvin cycle?
stroma of the chloroplast
Which of the following is a reasonable explanation for why unsaturated fatty acids help keep any membrane more fluid at lower temperatures?
the double bonds form a kink in the fatty acid tail, forcing adjacent lipids to be further apart.
Assume that you have given a bacterial cell radioactive thymidine so that the DNA in the cell was completely labeled. Also assume that no other component of the cell is labeled. Now you take away the radioactive thymidine and allow the cells to divide. Remember the old DNA is still radioactive. After 2 rounds of ell division there are 4 cells. How many of these cells will be radioactive?
two will be radioactive