The movement of substances from lower to higher concentration across a semipermeable membrane that must have a specific protein carrier and cell expenditure of energy is called
A. endocytosis.
B. diffusion.
C. osmosis.
D. active transport.
E. facilitated diffusion.
Answer: D
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Which situation would be most likely to form a fossil under normal environmental conditions?
A. An elephant that died at the edge of a waterhole. B. A bird that died and fell to the forest floor. C. A slug that died in leaf litter. D. A jellyfish that died in an estuary.
DNA polymerase ____
a. synthesizes a short RNA segment to begin DNA replication b. adds nucleotides to the 5' end of an existing strand to synthesize a new DNA strand c. adds nucleotides to the 3' end of an existing strand to synthesize a new DNA strand d. seals nicks between adjacent segments of DNA e. unwinds the DNA double helix at the origin of replication
The oldest megafossils of vascular plants belong to the phylum Rhyniophyta
____________________ Indicate whether the statement is true or false.
Explain why some people fear genetically modified foods despite commercial organization claims that these foods are safe for human consumption
What will be an ideal response?