Which of the following is NOT a pyrimidine?

A. Uracil
B. Thymine
C. Cytosine
D. Adenine


Answer: D

Biology & Microbiology

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Opsonizing antibodies are those that function by:

a. attaching to the surface of pathogens and contributing to their destruction by the lytic action of complement. b. binding to and blocking surface receptors for host cells. c. attaching to the surface of pathogens and making the pathogens more amenable to ingestion by phagocytic cells. d. attaching to the surface of pathogens and contributing to their destruction by che-motaxis.

Biology & Microbiology

Cholesterol can be scavenged by

a. VLDLs b. HDLs c. LDLs d. LCATs e. HDLs and LDls

Biology & Microbiology

In many species, there are two representatives of each chromosome. In such species, the characteristic number of chromosomes is called the ________ number. It is usually symbolized as ________

A) haploid; n B) diploid; n C) diploid; 2n D) haploid; 2n E) None of the answers listed is correct.

Biology & Microbiology

Alleles are described as ________

A) homologous chromosomes B) environmental factors that affect gene expression C) alternate versions of a gene D) alternate phenotypes

Biology & Microbiology