Which of the following are primarily responsible for cytokinesis in plant cells but not in animal cells?
A) kinetochores
B) Golgi-derived vesicles
C) actin and myosin
D) centrioles and centromeres
B
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Clostridium botulinum toxin is
A. heat-stable. B. an exotoxin. C. endotoxin. D. heat-sensitive. E. an exotoxin AND heat-sensitive.
In humans, nitric oxide is an important gaseous neurotransmitter. Nitric oxide is synthesized by three isoforms of nitric oxide synthase (NOS). What would be a likely effect if a male were missing the gene that codes for one of the NOS isoforms?
A. He would be unable to produce all the liquid components of semen. B. He would have high levels of mutation within his mature sperm. C. He would have difficulty getting and/or sustaining an erection. D. He would have a low sperm count due to decreased spermatogenesis.
Which organelle migrates during M phase to form the two opposite poles of the dividing cell and acts as the source of the spindle fiber microtubules?
A) centromere B) kinetochore C) centrosome D) chiasmata E) chromosome
Which specialization evolved in land plants to allow for reproduction in dry conditions?
A. Xylem B. Phloem C. Stomata D. Roots E. Sporophyte dominance