DNA consists of two antiparallel strands of nucleotides held together by

A. hydrogen bonds.
B. ionic bonds.
C. covalent bonds.
D. peptide bonds.


Answer: A

Biology & Microbiology

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Animal models such as the ____________________ and ____________________ are being studied to identify single genes that control aspects of learning, memory, and spatial perception

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Each human kidney is covered by a renal capsule made of _____

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Closely related plant species that attract different pollinators resulting in reproductive isolation is an example of

A. sympatric speciation. B. allopatric speciation. C. hybrid inviability. D. hybrid infertility. E. hybrid breakdown.

Biology & Microbiology

When a cell makes a cell membrane bound growth factor that binds to receptors on neighboring cells causing them to proliferate, this is an example of

A. direct intercellular signaling. B. contact-dependent signaling. C. autocrine signaling. D. paracrine signaling. E. endocrine signaling.

Biology & Microbiology