A change in one nucleotide of the DNA sequence, that results in the same amino acid being coded for is called a _____.
A) missense mutation
B) silent mutation
C) nonsense mutation
D) frameshift mutation
Ans: B) silent mutation
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The human body's arterial blood pH is tightly maintained around 7.4 by buffering agents that bind hydrogen ions to stop any change in pH. If an acid-base imbalance overcomes the buffer system, the body changes the ventilation rate, or the rate at which gas enters or leaves the lungs. Changing the ventilation rate changes the concentration of CO2 in the blood, which alters the pH of the blood. In this case, pH 7.4 is the:
A. homeostatic challenge. B. sensor. C. effector. D. integrator. E. set point.
What is a typical characteristic of bacterial chromosomes?
A) On average 5% of the genome encodes proteins. B) It has telomeres. C) It is linear. D) On average a gene occurs once in every 1000 bp. E) It is single-stranded DNA.
Answer the following questions true (T) or false (F)
1. If something is oxidized, it loses electrons. 2. The human genome is estimated to include 20,000 to 25,000 genes. 3. Anaphase is characterized by the separation of sister chromatids.
An atom that normally has __________ in its outer shell would NOT tend to form chemical bonds with other atoms.
Fill in the blank(s) with the appropriate word(s).