In mosses male gametes are produced in the
A. antheridia.
B. sporophyte.
C. archegonium.
D. capsule.
A. antheridia.
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TEM provides a thin, two-dimensional section of the object being studied.
a. true b. false
Which of the following characteristics of a medicine might be effective in treating a herpes simplex (a virus, not a bacteria) infection with as little harm to the patient as possible?
A) blocking cell wall synthesis B) halting membrane formation C) preventing capsid formation D) stopping cilia activity
Stomata are used by plants to facilitate gas exchange. Why are they absent in charophytes?
A. They are present in charophytes but have been reduced to a vestigial state. B. Gasses freely diffuse through uncoated charophyte tissues. C. Charophytes use organic acids as a carbon source. D. Stomata are an exclusively aquatic adaptation.
Which of the following is not good direct evidence that the cell-cycle control system is conserved through billions of years of divergent evolution?
(a) A yeast cell lacking a Cdk function can use the human Cdk to substitute for its missing Cdk during the cell cycle. (b) The amino acid sequences of cyclins in plants are similar to the amino acid sequences of cyclins in humans. (c) The Cdk proteins in humans share conserved phosphorylation sites with the Cdk proteins in yeast. (d) Yeast cells have only one Cdk, whereas humans have many Cdks.