Of the 20 standard amino acids, only ___________ is not optically active. The reason is that its side chain ___________.
A) alanine; is a simple methyl group
B) glycine; is a hydrogen atom
C) glycine; is unbranched
D) lysine; contains only nitrogen
E) proline; forms a covalent bond with the amino group
Ans: B) glycine; is a hydrogen atom
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Selenite broth serves which purpose when used in the bacterial fecal culture?
a. Evaluation of general flora and predomi-nant species b. Selection of enteric pathogens such as Salmonella, Aeromonas, and others c. Inhibition of normal flora and selection of enteric pathogens d. Enrichment for enteric pathogens such as Salmonella and others
As a couple, you have been trying to get pregnant for a few years, but there appears to be a medical cause for the infertility. After a full checkup, your doctor tells you that there is scar tissue in the uterine tubes. What disease is the most likely cause of this problem?
A. Gonorrhea B. Trichomoniasis C. Syphilis D. Leptospirosis
Two parents with Type A and Type B blood have a child with Type AB blood. How is this possible?
A. Type A blood is incompletely dominant to Type B blood. This means that individuals with alleles for both Type A and Type B will express a blended intermediate between these two blood types. B. Type A blood is codominant with Type B blood, so both alleles are expressed equally. C. Type A blood is co-recessive with Type B blood, so as long as there is not a dominant blood type present, both recessive alleles will be expressed equally. D. This is not possible. The child cannot be their biological child.
Split or interrupted genes have been found in eukaryotes but not in bacteria or archaea.
Answer the following statement true (T) or false (F)