Chordates are bilaterally symmetrical, triploblastic deuterostomes.
a. true
b. false
Ans: a. true
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What happens when the concentrations of a solute that can freely diffuse across a membrane are equal inside and
outside the cell?
a. The osmotic pressure is equilibrated on both sides of the membrane. b. Solute molecules no longer diffuse across the membrane. c. Solute molecules continue to diffuse across the membrane. d. Transporter proteins are inhibited to prevent movement across the membrane. e. Channel proteins are gated to prevent movement across the membrane.
Which scenario is not an example of a prezygotic isolating mechanism?
a. An iris blooms at a different time of the year than a daffodil. b. A peacock puts on a different mating display than a sparrow. c. A snail with a shell coiling in one direction cannot mate with a snail whose shell curls in the other direction. d. A zebroid, a cross between a horse and zebra, is sterile. e. One type of roundworm would reject the sperm from another species of roundworm.
When Mendel used true-breeding white flowers and true-breeding purple flowers as the parental generation, what were the results? (Purple flower is dominant over white.)
A) All of the offspring had purple flowers. B) Three-quarters of the flowers produced were white and one-quarter were purple. C) One-half of the flowers produced were white and one-half were purple. D) Three-quarters of the flowers produced were purple and one-quarter were white. E) All of the offspring had white flowers.
True or False: Upper respiratory pathogens are generally more deadly than lower respiratory pathogens
a. TRUE b. FALSE