The term coenocytic refers to a giant cell containing many nuclei
A. true
B. false
A
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Which statement about the cytoskeleton is correct?
a. Microfilaments are narrower than both intermediate filaments and microtubules. b. Microfilaments resist compressive forces on the cell and help it to retain its shape. c. Intermediate filaments provide pathways for organelles to follow during cell division. d. Microtubules are involved in movement external to the cell but not internally.
Mutations are the original source of new alleles, but
many are __________ or __________. Fill in the blank(s) with the appropriate word(s).
Consider a human somatic cell in the G2 phase of the cell cycle. Which statement is true about the DNA molecules at this stage ?
A: Each chromosome consists of two identical DNA molecules joined at a centromere. B: The DNA molecules are not yet associated with histones (nucleosomes). C: The DNA molecules are part of highly condensed rod-like chromosomes. D: A and B. E: A and C.
An isotope is an atom of an element that varies in mass number due to variation in the number of
A. atoms. B. protons. C. neutrons. D. electrons.