The zona pellucida and corona radiata are associated with which one of the following?
A) human egg
B) uterine lining
C) midpiece of the human sperm
D) cilia of the oviducts
E) vaginal wall
A
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A gram-negative, oxidase-positive diplococcus growing on chocolate agar likely belongs to the genus
A) Neisseria. B) Escherichia. C) Mycobacterium. D) Pseudomonas.
A biologist discovers a new species of organism adapted to living in a deep underground cavern that provides no source of free water. The organism is eyeless and covered by fur, and it has a four chambered heart with a closed circulatory system. What excretory system adaptations to this extreme environment might the biologist expect to find?
A. very long malpighian tubules B. very short malpighian tubules C. metanephridia with a large number of nephridiopores D. nephrons with long loops of Henle E. nephrons with short loops of Henle
In the cellular slime mold Dictyostelium, cAMP is the signal that causes cells to ________
a. aggregate b. all of the choices c. change their gene expression d. differentiate into components of a stalk or spores
Virulence determinants (factors) of Helicobacter pylori include which of the following?
A. Motility. B. Urease enzyme. C. Adhesins D. All of the above are correct.