Emerging infectious diseases are due to:
A. Deforestation
B. Humans moving to previously inhabited areas
C. Mutations in existing microbes
D. All of the above
Ans: D. All of the above
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What is one of the ways plants overcome dispersal issues associated with vegetative reproduction?
A. Horizontal stems grow away from the parent, allowing new shoots to grow at a distance from the parent. B. Specialized seed coats can enable wind dispersal. C. Fruits encourage animal-assisted dispersal. D. Plantlets cluster near the parent plant. E. Plant dispersal is not an issue for vegetatively reproducing plants.
Membrane-bound organelles have been an important component in the evolution of complex, multicellular organisms. Which of the following best summarizes an advantage of eukaryotic cells having internal membranes?
(A) Eukaryotic cells are able to reproduce faster because of the presence of organelles. (B) Some organelles, such as mitochondria and chloroplasts, are similar to prokaryotic cells in structure. (C) Organelles isolate specific reactions, increasing metabolic efficiency. (D) Compartmentalization leads to a higher mutation rate in DNA, which leads to more new species.
TRH is a type of ________ hormone secreted by the ________
A) steroid; thyroid gland B) releasing; hypothalamus C) peptide; thymus D) releasing; anterior pituitary
In the sodium-potassium pump, sodium and potassium are both pumped out of the cell via active transport.
Answer the following statement true (T) or false (F)