The evolution of angiosperms increased the productivity of terrestrial ecosystems
A. true
B. false
A
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Answer the following statements true (T) or false (F)
1. Unmethylated CpG islands are correlated with inactive genes. 2. Loosely packed chromatin is said to be in an open conformation. 3. Alternative versions of proteins often have similar functions. 4. MicroRNAs increase the rate of mRNA translation.
Food (organic molecules such as glucose) is produced in the
A. mitochondria. B. nucleolus. C. centriole. D. chloroplast.
A bacterium, such as E.coli is extremely sensitive to changes in its environment. Which of the following changes might a bacterium have to perceive and respond to?
a) change in the light intensity of the intracellular environment b) change in the pH of the intracellular environment c) increase in the surface area of the cell wall d) change in the solute concentration in the extracellular environment e) increase in electric impulses
Asthenozoospermia is a medical condition that is characterized by reduced sperm motility. What structure of the sperm is likely affected in a man who has asthenozoospermia?
A) acrosome B) head C) middle piece D) flagellum