Several different researchers all contributed to the study of the structure of DNA. For each of the following researchers, match their contribution.

A. Rosalind Franklin
B. Frederick Griffith
C. Oswald Avery
D. Erwin Chargaff


A. DNA is a repeating helical structure.
B. There is a transforming factor that exists and can change bacteria's characteristics.
C. Transformation of bacteria did not occur with the addition of DNase enzyme, suggesting DNA is the genetic material.
D. The percent of adenine is equal to the percent of thymine and the percent of guanine is equal to the percent of cytosine.

Biology & Microbiology

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Choose the answer that correctly completes the statement:

In deoxyribonucleotides, the pyrimidines are bound to the 1' carbon of pentose sugar by a ____________¬¬_ to _____________of the base. A. glycosidic bond; N-1 B. glycosidic bond; N-9 C. hydrogen bond; N-1 D. phosphodiester bond; N-3 E. glycosidic bond; N-3

Biology & Microbiology

Males more commonly are affected by Xlinked

recessive genetic disorders than are females because

a. females have two X chromosomes and thus less of a chance to be recessive. b. males have only one X and thus more of a chance to be recessive. c. males have only one X, they have multiple alleles for each gene. d. Y chromosomes cause X gene mutations. e. males are weaker genetically than females

Biology & Microbiology

Describe what occurs during cleavage, growth, morphogenesis, and differentiation.

What will be an ideal response?

Biology & Microbiology

Which of the following is the organ for maternal-embryo exchange?

a. yolk sac b. amnion c. chorion d. allantois e. placenta

Biology & Microbiology