Pinworm is a nematode parasite that lives in the human rectum, and causes itching in the anal area. What best explains the itching symptom?
A. Any kind of parasite will naturally irritate the skin.
B. The itching is because of the mismatch between humans and the parasite's natural host.
C. The itching induces the person to scratch, helping to spread the parasite to another person.
D. The itching is a side-effect when the immune system has successfully attacked the nematode.
Answer: C
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How do organisms make use of nitrogen?
What will be an ideal response?
Answer the following statements true (T) or false (F)
1. Prokaryotes are only found in the domain Bacteria. 2. Plastid organelles, such as mitochondria and chloroplasts, contain their own DNA and ribosomes. 3. Flagella move by way of dynein proteins that connect microtubules and force them to shift back and forth to bend or rotate the flagella. 4. As the cell doubles in dimensions from its original size, the surface area would increase much more than the internal volume of the cell. 5. Because mitochondria, chloroplasts, and other plastids have their own DNA and ribosomes within double membranes, they are also considered cells.
Which of the following would most quickly be eliminated by natural selection?
A) a harmful allele in an asexual, haploid population B) a harmful recessive allele in a sexual, diploid population C) a harmful recessive allele in a sexual, polyploid population D) any harmful allele, regardless of the system of inheritance in a population
Which of the following is an example of vertical transmission?
A. a sneeze transmitting a cold B. a mother transmitting syphilis to her fetus C. oral-fecal transmission involving a diaper D. drinking contaminated water E. a mosquito bite