In synaptic signaling, neurotransmitters are released into a space that is referred to as a:
A. gap junction.
B. plasmodesmata.
C. neuron junction.
D. paracrine space.
E. chemical synapse.
Answer: E
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Crick and his colleagues proposed that the genetic code consists of a series of blocks of information, called ______, each corresponding to one amino acid in an encoded protein.
A. alleles B. codons C. genes D. polypeptides
Which of the following suggested a method of DNA replication to Watson and Crick?
A. The backbone of the DNA helix is antiparallel. B. Due to complementary basepairing, each strand could act as a template for the other. C. The DNA helix has a major and a minor groove. D. The two strands are held together by strong, covalent bonds. E. The DNA helix is stabilized by hydrophobic stacking.
The ____ phylum contains one living vascular, seed-bearing plant species – a deciduous tree with fan-shaped leaves.
It has separate male and female plants, and the males are often planted in cities because of their resistance to pollution, insects, and disease.
a. Cycadophyta b. Anthophyta c. Gnetophyta d. Coniferophyta e. Ginkgophyta
This image shows an area in which a glacier has melted. What is indicated by the number “2”?
a. competition for food resources b. resource partitioning between two competing species c. emergence of climax species d. colonization by pioneer species e. secondary succession