Which of the following statements is not true of early plant evolution, as we have learned from Rhynie cherts?
A. Early vascular plants were small, up to 15
cm tall.
B. Early vascular plants branched repeatedly
and contained sporangia at their tips.
C. The stems of early vascular plants lacked
a cuticle or stomata.
D. Some of the early plants have a branched
sporophyte, but no evidence of vascular
tissue.
E. Fossils indicate that the roots and leaves
of lycophytes evolved independently from
those of ferns, horsetails, and seed plants.
C
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Viruses transmit bacterial genetic material from one bacterium to another in a type of horizontal gene transfer referred to as ____
Fill in the blank with the appropriate word.
Mitotic Cdk phosphorylates DNA repair proteins to prevent joining of ________ during mitosis
Fill in the blank with correct word.
If an organism's chromosomal DNA is like an instruction manual, what instructions do cells receive from genes?
A) continue growing until the cell can reproduce B) convert carbohydrates into enzymes C) make specific proteins from amino acids D) modify the cell shape for a changing environment
Both mosses and ferns "show their aquatic ancestry" because they:
A) require water for egg laying. B) typically require water for sperm delivery to the egg. C) lack a water-repellent cuticle. D) have roots that must remain wet at all times.