Answer the following questions true (T) or false (F)
1. Ciliates often have two kinds of nuclei that have different functions.
2. In fungi, aseptate hyphae are coenocytic by definition.
3. Algae can have different types of photosynthetic pigments that allow them to photosynthesize at various depths in water.
1. TRUE
2. TRUE
3. TRUE
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Microtubules are not involved in
a. movement of chromosomes during mitosis. b. transport of membranous vesicles in the cytoplasm. c. cytokinesis of animal cells. d. movement of cilia and flagella. e. positioning of Golgi in cells.
Animals that have a ventral nerve cord during embryonic development are classified as chordates
Indicate whether the statement is true or false
Huntington's disease is caused by a single dominant allele. It is a lethal disease, yet it persists in the human population. Which of the following statements best describes why?
A. Huntington's disease is sex-linked and every human has at least one X chromosome; thus, the chances are extremely high for this allele to be maintained in the human population. B. While lethal to a parent, Huntington's disease will not be lethal to the offspring since it can skip a generation. C. Even though Huntington's disease is lethal, it improves chances for reproduction before the person dies. D. Huntington's disease presents symptoms in midlife, after most people have already had offspring. E. Huntington's disease can present symptoms so mild that they appear to lack dominant expression of the allele in some individuals; in those cases, the allele is passed on to the offspring.
The long, thread-like branching cells of molds are called
A. Conidiophores B. Pseudohyphae C. Hyphae D. Septate E. Ascus