Fats composed of fatty acids that have double bonds in the fatty acids and have fewer than the maximum number of hydrogen atoms are:
A. made of glycerol plus two fatty acids
B. liquids at room temperature
C. saturated
D. solid at room temperature
E. generally found in animal fats
Answer: B
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Antibiotic resistance resulting from altered cellular physiologic structure caused by changes in a microorganism's usual genetic makeup is known as __________ resistance
a. intrinsic b. inherent c. acquired d. environmentally mediated
In birds, sex is determined by a ZW chromosome scheme. Males are ZZ and females are ZW. A lethal recessive allele that causes death of the embryo is sometimes present on the Z chromosome in pigeons. What would be the sex ratio in the offspring of a cross between a male that is heterozygous for the lethal allele and a normal female?
A) 2:1 male to female B) 1:2 male to female C) 1:1 male to female D) 4:3 male to female E) 3:1 male to female
Which organelle encloses and protects a cell's DNA?
a. peroxisome b. nucleus c. Golgi apparatus d. endoplasmic reticulum e. mitochondria
The mechanism of action of the antibiotic vancomycin is
A) inhibition of protein synthesis. B) inhibition of cell wall synthesis. C) inhibition of nucleic acid synthesis. D) inhibition of a metabolic pathway. E) disruption of cytoplasmic membranes.