Which of the following is a correct statement about sugar movement in phloem?
a) Only phloem cells with nuclei can perform sugar movement.
b) Sugar is translocated from sinks to sources.
c) Movement can occur both upward and downward in the plant.
d) Sugar transport does not require energy.
e) Diffusion can account for the observed rates of transport.
Ans: c) Movement can occur both upward and downward in the plant.
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Which of the following is true of DNA?
A. The nucleotides in one strand are connected by hydrogen bonds. B. A phosphate group in a nucleotide is attached to the 3 carbon in ribose. C. A purine always forms a complementary base pair with a pyrimidine. D. The percentage of the purine A always equals the percentage of the purine G. E. It is used by ribosomes for translation.
A blastomere is a ________ and a blastocyst is ________.
A) fetal organ produced by cleavage; an embryonic organ produced by cleavage B) fetal membrane; an embryonic membrane C) cell produced by cleavage; a hollow ball of cells D) solid ball of cells; three-layered embryo
Answer the question using the accompanying figure. The slug is the structure with the label ____
a. A b. B c. C d. D e. E
Answer the question using the accompanying figure. The letter “A” represents ____
a. rapid growth b. negative growth c. prereproductive populations d. postreproductive populations e. zero growth