Which of the following is true regarding primary growth in a plant?
a. Primary growth increases the height of a plant.
b. Primary growth results in woody tissue.
c. Primary growth arises from apical meristems.
d. All the above are true.
e. Only a and c are true.
E; Woody tissues are the result of secondary growth, not primary. Primary growth originates from apical meristems that are found at the tips of roots and shoots (in dicots). Therefore, primary growth tends to increase the height of a plant.
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This hemorrhagic fever causes disease in humans and nonhuman primates such as chimpanzees, gorillas, and monkeys. It is identified in the laboratory using which type of assay?
a. Immunodiffusion b. Peptide nucleic acid fluorescence in situ hybridization (PNA-FISH) c. Transcription-mediated amplification (TMA) d. Reverse-transcriptase polymerase chain reaction (PCR)
During the late 1800s, which of these technological developments contributed the most to scientific knowledge of the role played by chromosomes in inheritance?
a. radiocarbon dating b. early DNA sequencing c. improvements in microscopy d. mass spectrometry
Because DNA replication takes place at an extremely rapid rate, a cell must repair breaks in a strand of DNA up to
approximately how many times in an hour? a. 10 b. 1,000 c. 10,000 d. 200,000 e. 2,000,000
What would result if an error inside gastrulation caused too few cells inside the archenteron?
A. Too little ectoderm, resulting in missing nervous system or skin B. Problems in muscle development C. Too little protoderm, resulting in missing organs D. Too little endoderm, resulting in missing gut and organs