What is the symbol for sodium?

A. Na
B. Dm
C. So
D. N
E. S


Answer: A

Biology & Microbiology

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The proteobacterium Rhizobium lives in a close association with legume roots, providing a source of nitrogen for the plant. In return, the plant provides Rhizobium with food produced by photosynthesis. In this relationship, Rhizobium is an example of a(n):

A. pathogen B. parasite C. producer D. methanogen E. mutualist

Biology & Microbiology

Argon has 18 protons. How many electrons are in its third energy level?

a. 2 b. 4 c. 6 d. 8 e. 10

Biology & Microbiology

In in-vitro fertilization, sperm are placed in the vagina of a woman by a physician.

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

Biology & Microbiology

Tay-Sachs disease is a(n) ____ disease that results in blindness, intellectual disability, and death due to ____

a. sex-linked; the absence of one of the sex chromosomes b. autosomal recessive; accumulation of lipids in brain cells c. X-linked; accumulation of acetyltransferases in brain cells d. autosomal; sickled red blood cells e. autosomal dominant; accumulation of mucus in the lungs

Biology & Microbiology