Why is chlamydia much more common than syphilis?
A. Many chlamydia infections are asymptomatic.
B. Syphilis can penetrate a condom whereas chlamydia cannot.
C. Chlamydia is viral, and viral diseases spread much quicker.
D. Chlamydia is spread via droplet inhalation.
E. Chlamydia is resistant to most antibiotics.
Answer: A
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About 4% of those of Northern European descent are carriers for ____, an autosomal recessive genetic
disorder where a defective membrane transport protein leads to abnormal chloride levels in extracellular fluids.
a. Duchenne muscular dystrophy b. phenylketonuria c. achondroplasia d. sickle-cell anemia e. cystic fibrosis
A(n) ________ is a chemical that can be used to sterilize materials.
A. antiseptic B. oxidant C. disinfectant D. sterilant
Many freshwater invertebrates eliminate ammonia by...
a) simple diffusion across the skin b) simple diffusion across the gill membranes c) converting it to uric acid and eliminating it with solid wastes d) converting it to urea and eliminating it in their urine
If we think of the DNA double helix as a twisted ladder, what makes up the rungs or steps of the ladder?
A. purines and pyrimidines B. alternating phosphate groups and sugars C. phosphate groups and bases D. sugars only E. phosphate groups only