The ________ is a gland that often enlarges as a man ages, potentially causing problems with urination

Fill in the blank(s) with correct word


prostate

Biology & Microbiology

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 Referring to the figure of sperm penetration and fusion, match the lettered description with the correct numbered step in the figure.



A. Some of the zona pellucida is degraded by acrosomal enzymes.
B. Enzymes are released by cortical granules that harden the zona pellucida.
C. Sperm and egg fuse at the plasma membrane.
D. Sperm penetrates the corona radiata.
E. The sperm nucleus dissociates and enters the cytoplasm.
F. Additional sperm can no longer penetrate.


1. Step I 
2. Step II 
3. Step III 
4. Step IV 
5. Step V 
6. Step VI 

Biology & Microbiology

In studies of two species of barnacles in the marine intertidal zone it was observed that Chthamalus can live in the upper intertidal zone and the lower intertidal zone if Semibalanus is absent, and Semibalanus can only live in the lower zone because it is more subject to dehydration. Based on this, which of the following statements are true? Check all that apply.  

_____  The realized niches of the two species differ. _____  The fundamental niche of Chthamalus is larger than its realized niche. _____  The fundamental niche of Chthamalus is larger than the fundamental niche of Semibalanus. _____  The fundamental and the realized niches of Chthamalus are the same. _____  The fundamental and the realized niches of Semibalanus are the same.

Biology & Microbiology

A(n) ____________________ is the interacting populations of all the species in a habitat. Fill in the blank(s) with the appropriate word(s)

Biology & Microbiology

Which of the following was successfully used to treat a patient with severe combined immunodeficiency (SCID)?

A) Vaccines B) Gene therapy C) Bt toxins D) Growth hormones E) Insulin

Biology & Microbiology