The body's innate defenses against infection include
A) several specific antibodies.
B) barriers such as dead skin cells and mucus.
C) increased production of certain hormones and changes in microcirculation.
D) memory cells.
Answer: B
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What is the difference between mitochondria and chloroplasts?
A. Mitochondria have linear strands of DNA and chloroplasts have rings of DNA. B. Mitochondria produce oxygen and chloroplasts produce carbon dioxide. C. Mitochondria have three membranes and chloroplasts have two membranes. D. Mitochondria are oxidative metabolic bacteria derivatives and chloroplasts are photosynthetic bacteria derivatives.
Cells that can engulf foreign particles, and can ingest, kill, and digest most bacterial pathogens are called
A) red blood cells. B) phagocytes. C) reticulocytes. D) resistant cells.
True or false: During the incorporation of a nucleotide during transcription, appropriate hydrogen bonding is ensured before the high-energy phosphate bond is cleaved
A. true B. false
Which hominid is considered to be the handyman by being the first to use tools?
What will be an ideal response?