The chemical signal sent out by macrophages to mobilize the immune system is
A. interleukin-2.
B. interferon.
C. interleukin-1.
D. perforin.
Answer: C
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In eukaryotes, photosynthesis takes place inside the ________.
A. chloroplasts B. mitochondria C. cytoplasm D. Golgi apparatus
There is an autosomal gene that controls baldness, and
its expression is sex-influenced, so that the gene for baldness (B) is dominant in males but recessive in females. In females the allele B1 for nonbaldness is dominant over the gene for baldness. If a heterozygous nonbald woman marries a nonbald man, what will be the appearance of their children? Work out the possibilities for each sex. What will be an ideal response?
The herbicides (weed killers) 2,4-D and 2,4,5-T are examples of synthetic:a
abscisic acid. b. auxins. c. cytokinins. d. ethylene. e. gibberellins.
In the classic experiment that demonstrated the semiconservative nature of DNA replication, cells were grown in 14N and 15N, and DNA was separated by
a. electrophoresis. b. differential centrifugation. c. velocity density-gradient centrifugation. d. equilibrium centrifugation.