Which of the following are the purine nucleotides in DNA?

A) Adenine and thymine
B) Cytosine and guanine
C) Adenine and cytosine
D) Guanine and adenine
E) Thymine and uracil


D

Biology & Microbiology

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A cabinet maker is primarily involved in tertiary activities

Indicate whether this statement is true or false.

Biology & Microbiology

The urine of marine mammals is ____ when compared to ____

a. hypoosmotic; seawater

b. hypoosmotic; their body fluids c. hyperosmotic; seawater d. isoosmotic; their body fluids e. isoosmotic; seawater

Biology & Microbiology

Which of the following is an accessory system of vessels and organs that helps balance the fluid

content of the blood and surrounding tissues?

a. Circulatory system. b. Non-circulatory system. c. Accessory vessel system. d. Lymphatic system. e. Heart.

Biology & Microbiology

A condensed, female X chromosome is called a

a. Barr body. b. Morgan sphere. c. SRY gene. d. karyotype. e. linkage map.

Biology & Microbiology