Sickle-cell disease is caused by ___________.

A. a heterozygous situation
B. a recessive allele
C. the parasite that also causes malaria
D. sexual dimorphism


B. a recessive allele

Biology & Microbiology

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The ability to taste PTC is a dominant trait. If a heterozygote woman has a child with a man who is not a taster, what is the chance their child will be a taster?

A. 50% B. 25% C. 100% D. 0% E. 75%

Biology & Microbiology

Hot carbol fuchsin is the primary dye in the acid-fast stain.

Answer the following statement true (T) or false (F)

Biology & Microbiology

This organism would belong to which group of animals?

1.sponges 2.jellyfishes 3.echinoderms 4.chordates

Biology & Microbiology

A mutation in the gene encoding the integrase enzyme renders the protein non-functional. How would this affect-the HIV infection cycle?

A. The viral DNA would not be able to integrate the viral genome into a chromosome. B. The gp120 glycoprotein would not be able to bind the CCR5 receptor. C. Cutting and assembling the capsid would be halted.  D. Reverse transcription would not be possible. 

Biology & Microbiology