Which statement is false?
A) Only animal cells contain DNA; plant cells do not.
B) DNA can serve as an "individual identifier."
C) With the exception of identical twins, every person's DNA is unique.
D) DNA carries instructions for the functions of every cell and enzyme in the body.
E) DNA carries a record of evolutionary history.
A) Only animal cells contain DNA; plant cells do not.
You might also like to view...
Which of the following pHs is the most acidic?
a. 1 b. 3 c. 5 d. 7 e. 9
In the polymerase chain reaction (PCR) the DNA is first heated to break the hydrogen bonds between the two polynucleotide strands, producing two single-stranded molecules that will serve as templates. Which of the following choices would be the second step in PCR?
1.The mixture is cooled and primers bind to complementary DNA regions. 2.Taq polymerase synthesizes a complementary DNA strand for each single-stranded molecule. 3.The mixture is heated and primers bind to complementary DNA regions. 4.The DNA is cut into fragments with a restriction enzyme. 5.The DNA is stained.
When calcium levels decline, the __________
secrete(s) __________, which __________ osteoclast activity. a. parathyroids; calcitonin; suppresses b. thyroid; calcitonin; suppresses c. thyroid; calcitonin; enhances d. thyroid; PTH; suppresses e. parathyroids; PTH; enhances
When double-stranded DNA is heated, the two strands separate into single strands in a process called melting or denaturation. The temperature at which half of the duplex DNA molecules are intact and half have melted is defined as the Tm
A. Do you think Tm is a constant, or can it depend on other small molecules in the solution? Do you think high salt concentrations increase, decrease, or have no effect on Tm? B. Under standard conditions, the expected melting temperature in degrees Celsius can be calculated from the equation Tm = 59.9 + [0.41 ×%(G + C)] – (675/length of duplex). Does the Tm increase or decrease if there are more G + C (and thus fewer A + T) base pairs? Does the Tm increase or decrease as the length of DNA increases? Why? C. Calculate the predicted Tm for a stretch of double helix that is 100 nucleotides long and contains 50% G + C content.