The two nitrogen atoms in nitrogen gas (N2 ) share six electrons forming a _____.

A. hydrogen bond
B. double bond
C. single covalent bond
D. double covalent bond
E. triple covalent bond


E. triple covalent bond

Biology & Microbiology

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The map distances for four linked genes are as follows: A is 22 cM from B, B is 7 cM from C, C is 9 cM from D, B is

2 cM from D, A is 20 cM from D, and A is 29 cM from C. Based on these data, what is the order of these four genes on the chromosome?

a. ABCD b. ADBC c. ABDC d. BADC e. CADB

Biology & Microbiology

Which of the following would most likely

contain blood that needs to be cleansed?

a. the renal vein b. the renal artery c. the nephron d. all of these e. none of these

Biology & Microbiology

What is the correct order in bacterial antigen

processing and presentation? 1. lysosomal enzymes digest the bacterium into molecular bits 2. the antigen-MHC complex is displayed on the cell surface 3. the endocytic vesicle fuses with a lysosome 4. a bacterium is engulfed by a phagocytic cell

a. 4-3-1-2 b. 4-3-2-1 c. 3-4-2-1 d. 3-4-2-1 e. 2-4-3-1

Biology & Microbiology

Tom is choking on a piece of steak that is stuck in his trachea, and he signals for his young son to call 911. It takes the paramedics four minutes to reach his house. Will this be in time to save Tom (and why), or will Tom already be dead (and why)?

A. Tom will be alive since he had a reserve of about three-quarters of his hemoglobin still bound to oxygen when he started choking. B. Tom will be alive since the myoglobin in his muscles will release oxygen into the blood after he stops breathing. C. Tom will be dead since all the hemoglobin in his arterial blood will unload its oxygen during the first pass through the tissues after his last breath. D. Tom will be dead due to the lowered pH of his blood.

Biology & Microbiology