Which of the following do guard cells act to regulate?

A) stomata
B) cuticle
C) epidermis
D) root hairs


A

Biology & Microbiology

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Which of the following is most similar to lysogeny?

A) Hfr state B) F+ state C) F- state D) F' state

Biology & Microbiology

The fertilized ovum that contains genetic material from both parents, for a total of 46 chromosomes. _____

A) Human chorionic gonadotropin

B) Zygote

C) Chorion

D) Morula

E) Folic acid

F) Fertilization

G) Blastocyst

H) Parturition

I) Cleavage

J) Ovulation

K) Placenta

L) Implantation

Biology & Microbiology

 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

All EXCEPT which of the following are significant

routes for water loss from the body? a. excretion in urine b. sneezing c. sweating d. elimination in feces e. evaporation from respiratory surfaces

Biology & Microbiology