Which of the following gives the correct order of layers the sperm crosses when entering the egg?

A. oocyte plasma membrane, corona radiata, zona pellucida
B. corona radiata, oocyte plasma membrane, zona pellucida
C. zona pellucida, oocyte plasma membrane, corona radiata
D. zona pellucida, corona radiata, oocyte plasma membrane
E. corona radiata, zona pellucida, oocyte plasma membrane


Answer: E

Biology & Microbiology

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The hydrogen-bond lattice causes water to have an unusually ____ specific heat and an unusually ____

heat of vaporization for its molecular weight.

a. high; high b. low; high c. high; low d. low; low

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Why is taking the first breath hard work for the newborn?

A) The lungs are not elastic. B) The intercostal muscles are not mature enough. C) The diaphragm is inflexible. D) The surface tension within the alveoli is very high. E) The respiratory center in the medulla is not yet mature.

Biology & Microbiology

Scrapie is an example of a ________ disease found in sheep and caused by a prion.

a) neurological b) gastrointestinal c) respiratory d) cardiovascular

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The plasmodesmata in plants are functionally most similar to which animal cell junction?

(a) tight junction (b) adherens junction (c) gap junction (d) desmosome

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