If an egg cell contained EDTA, a chemical that binds calcium and magnesium, what effect would this have on reproduction?
A) The acrosomal reaction would be blocked.
B) The fusion of sperm and egg nuclei would be blocked.
C) The fast block to polyspermy would not occur.
D) The fertilization envelope would not be formed.
E) The zygote would not contain maternal and paternal chromosomes.
Answer: D) The fertilization envelope would not be formed.
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If you rub the scaled skin of a shark, it feels rough if you move your hand from tail to head but smooth if you move from head to tail. What is a major advantage of the scales being oriented this way?
A. to keep the shark afloat in the water B. to counteract friction as the shark swims through the water C. to better protect the shark from predators D. to better prevent water loss from the body tissues E. to enable the shark to orient itself in space and detect prey Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you know about the role of friction in movement? What other information is related to the question? Choose Answer · Given what you now know, what information is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
One major function of the 5? cap of a eukaryotic mRNA is
a. to provide a ribosomal binding site. b. to protect the mRNA from degradation. c. to minimize transcriptional errors. d. to provide a binding site for RNA polymerase. e. to catalyze intron removal.
The first person to use heating processes to preserve foods was ________.
A. Robert Koch B. Jacque Monod C. Louis Pasteur D. Nicholas Appert
A mutualistic association between a plant root and a fungus is known as a
(a) sac fungus. (b) lichen. (c) mycorrhizal root. (d) club fungus.