According to the sliding filament theory of muscle contraction,
A. calcium ions are released from myosin as the filaments slide by.
B. the thick and thin filaments do not change length during this process.
C. actin binds ATP and breaks it apart as actin pulls against myosin.
D. an accordion-like pleat is formed as the myosin and actin interact.
E. All of the choices are correct.
Answer: B
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If it were found that all animals except the Parazoa had a particular set of genes, one could conclude
A. that those genes are not useful in interpreting phylogeny. B. that Darwin was incorrect in his idea about descent with modification. C. that the Parazoa are not animals. D. that those genes probably are related to the embryonic formation of tissues. E. that those genes are related to cell wall formation.
Which of the following structures are external to both Bacterial and Archaeal cells?
A. Hami B. Pili C. Peptidoglycan D. Ribosomes
Pollen contains that produce .
A. gametophytes; sperm B. sporophytes; sperm C. gametophytes; spores D. sperm; spores E. sporophytes; spores
The current theory is that chloroplasts are descendants of symbiotic cyanobacteria that lived within eukaryotic cells. If we look at their respective genomes, however, we see that the cyanobacteria have many more genes than do chloroplasts
Where did these genes go? A. Restriction enzymes removed them. B. Endosymbiosis requires a reduction in genetic material in order to be successful. C. Many of them were transported to the nucleus, and others were lost. D. Nowhere. Cyanobacteria and chloroplasts actually have the same number of genes. E. None of the answers options is correct..