What was one of the pieces of evidence most critical to the discovery of DNA structure?

A. Its composition of four different nucleotides.
B. The discovery of its semi-conservative mode of replication.
C. An X-ray diffraction pattern suggesting a double helix shape.
D. The backbone containing sugar-phosphate linkages.
E. The hydrogen bonding between different nucleotides.


C. An X-ray diffraction pattern suggesting a double helix shape.

Biology & Microbiology

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Alternate forms of a gene are called ____

a. homologues b. loci c. alleles d. homozygous e. heterozygous

Biology & Microbiology

RNA is characterized by which one of the following features?

A. Deoxyribose B. Thymine C. Ribose D. Double-stranded

Biology & Microbiology

The key characteristic of a useful antimicrobial is selective toxicity

Indicate whether this statement is true or false.

Biology & Microbiology

In which of these animals are ingested nutrients NOT degraded by gut microbiota before reaching the small intestine?

a. sloth b. colobine monkeys c. horses d. macropod marsupials

Biology & Microbiology