Which of these molecules is typically double-stranded? 

A. mRNA
B. rRNA
C. tRNA
D. DNA


D. DNA

Biology & Microbiology

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Which of the following does NOT occur in prophase

I of meiosis? a. cytokinesis b. pairing of homologues c. formation of a bipolar spindle d. crossing over e. condensation of chromosomes

Biology & Microbiology

Segmentation was first apparent in the

A. annelids. B. vertebrates. C. chordates. D. flatworms.

Biology & Microbiology

________ dating involves age-dating fossils with known time periods grouped into four eras that represent distinct ages in the history of the earth.

Fill in the blank(s) with correct word.

Biology & Microbiology

Structures of the skeletal system include all of the following except:

A) bone. B) nails. C) ligaments. D) cartilage.

Biology & Microbiology