Four of the following are true of herpes simplex 1. Which one is the exception?
a. It is a DNA virus.
b. It has a latent phase in its replication cycle.
c. It can remain latent in nerve cells for years.
d. Activation of the latent virus causes cold sores.
e. Once activated it causes a form of skin cancer.
ANSWER: e
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Some dinoflagellates have the enzyme luciferase, which hydrolyzes ATP to ________
a. produce a toxin b. power bioluminescence c. cause flagella to rotate d. fix carbon during photosynthesis
Answer the following statements true (T) or false (F)
1.Human sperm swim to the egg. 2.The second stage of prenatal development is the fetal stage. 3.Stotting and mobbing are altruistic behaviors used by certain animals to warn others of danger. 4.Ethologists asking "why"-type questions in their studies are studying proximate causes of animal behavior. 5.Ethologists asking "how"-type questions in their studies are studying proximate causes of animal behavior.
The amnion is to the amniotic fluid as the allantois is to the
A. blood cell precursors. B. umbilical blood vessels. C. chorionic villi. D. yolk. E. amniotic cavity.
We can test the relative permeability of a phospholipid bilayer by using a synthetic membrane that does not contain any protein components. Some uncharged, polar molecules are found to diffuse freely across these membranes, to varying degrees
Which of the following has the lowest rate of diffusion across an artificial membrane? Why? (a) glucose (b) water (c) glycerol (d) ethanol