Which of the following represents an activity within a population?
a. a fox consuming a rabbit
b. the absorption of nitrogen by bacteria and converting it to a form useful to plants
c. a peacock spreading and shaking his feathers to attract a female
d. moss growing on the north side of a large pine tree
e. a virus causing rabies in a dog
ANSWER: c
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Mitochondria and chloroplasts are the other organelles besides the nucleus that contain:
A. pigments. B. pores. C. plasma membranes. D. channels. E. DNA.
The low pH of lysosomes is established by
A) acid hydrolases. B) ATP-dependent proton pumps. C) ?-glucuronidases. D) catalases. E) superoxide dismutases.
The number of bones in a newborn exceeds the number of bones in an adult. Why would the number of bones decrease over time?
A) Some bones are lost when they are replaced by adult versions, like the loss of baby teeth. B) Some of the bones of babies will eventually fuse together to become one larger bone. C) As some bones grow larger, others do not and are no longer needed. D) The bones of a baby are more fragile than an adult, so more are needed to support the weight of the body.
Which situation involves a risk to a fetus due to the mother smoking during pregnancy?
A. decreased digestive activity in the stomach of the fetus B. a decrease in the amount of oxygen in the ovary of the mother C. inhalation of secondhand smoke by the fetus D. toxins in the bloodstream of the mother