The special structure in which some actinomycetes form their spores is called a ________.
A. conidium
B. basidium
C. sporatorium
D. sporangium
Answer: D
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Certain cell types in humans, such as skeletal muscle cells, have several nuclei per cell. Based on your
understanding of mitosis, how could this happen?
a. The cell undergoes repeated cytokinesis but not mitosis. b. The cell undergoes repeated mitosis with concomitant cytokinesis. c. The cell undergoes repeated mitosis but not cytokinesis. d. The cell undergoes anaphase twice before entering telophase. e. The cell goes through multiple S phases before entering mitosis.
Which of the following is a function of stems?
a. sexually reproduce b. absorb nutrient minerals c. produce new tissues d. transport dissolved gases e. anchor plants
Individuals with an inherited autosomal recessive disorder called primary ciliary dyskinesia (PCD) often have severe respiratory problems due to defective cilia. Males with PCD are often sterile because they produce sperm with defective flagella. Which of the following most likely explains the effect of the recessive allele?
(A) The mitochondria are defective and do not produce sufficient protein to synthesize microtubules in the cilia and flagella. (B) The plasma membrane of the alveoli is not permeable to carbon dioxide during respiration because it is too hydrophobic. (C) The Golgi bodies secrete an enzyme that destroys the proteins in the flagella and cilia. (D) The cells do not produce functional motor proteins in flagella and cilia.
This 1-inch section of the brain controls the breathing rhythm and heart rate
A) medulla oblongata B) temporal lobe C) occipital lobe D) hippocampus