DNA fragments can be separated in gel electrophoresis because
A. nitrogenous bases have a net negative charge.
B. phosphate groups have a net negative charge.
C. nitrogenous bases have a net positive charge.
D. phosphate groups have a net positive charge.
Answer: B
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The ability of organisms to maintain consistent internal conditions within a narrow range is called _____.
a. chemotaxis b. heterotrophism c. homeostasis d. regulation
In Meselson and Stahl's experiment, what kind of DNA molecules would be found after four replication cycles?
A) Only heavy DNA (15N-15N) B) Only intermediate DNA (15N-14N) C) Only light DNA (14N-14N) D) Both heavy (15N-15N) and light DNA (14N-14N) E) Both heavy (15N-15N) and intermediate DNA (15N-14N)
If the acrosome cap of the sperm were to fall off, what would happen during fertilization?
A. The zona pellucida would not be weakened by the enzymes found in the acrosome cap of the sperm. B. The zona pellucida would depolarize at a faster rate than if the acrosome cap was present. C. The corona radiata would not be weakened by the fatty acids found in the acrosome cap of the sperm. D. None of the answer choices would occur. E. All of the answer choices would occur.
The ________ is used to convert the linear sequences of bases in DNA to the sequence of amino acids in proteins
Fill in the blank(s) with correct word