Imagine a cell entered mitosis but was unable to make microtubules. At what stage of mitosis would it remain? What will be an ideal response?
ANSWER: The cell would be stuck in prophase. It would be able to dismantle the nuclear membrane and
condense its chromosomes. Without microtubules, it would be unable to position the
chromosomes on the midway point for metaphase.
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Crossing over is more likely to occur between genes that are ______ on a chromosome
A. Close together B. Far apart
A unique feature of terrestrial filamentous fungi not found in aquatic fungi is
A. formation of flagellated spores that aid in spore dispersal. B. oxygen-impermeable structures including sclerotia and hyphal cords. C. mitochondria with highly invaginated cristae that permit more rapid diffusion of oxygen for oxidative phosphorylation. D. All of the choices are correct.
A certain unicellular eukaryote has a siliceous (glasslike) shell and autotrophic nutrition. To which group does it belong?
A) dinoflagellate B) diatom C) gymnamoeba D) foraminiferan E) cellular slime mold
Answer the following questions true (T) or false (F)
1. The end of a zygote that contains less yolk is the animal pole. 2. In general, the endoderm gives rise to tissues located deeper in the body than those from the ectoderm. 3. The blastocoel is the hollow cavity in the morula.