Which of these is a difference between a DNA and an RNA molecule?
a. DNA contains uracil, whereas RNA contains thymine.
b. DNA is double-stranded, whereas RNA is single-stranded.
c. DNA contains five-carbon sugars, whereas RNA contains six-carbon sugars.
d. DNA contains nitrogenous bases, whereas RNA contains phosphate groups.
e. DNA is a polymer composed of nucleotides, whereas RNA is a polymer composed of nucleic acids.
Answer: b. DNA is double-stranded, whereas RNA is single-stranded.
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Cycads and ginkgos differ from all other seed plants by:
A. having flagellated sperm within the pollen B. lacking cambium C. having the sexes separated on different trees D. being pollinated by wind instead of insects E. All of the ways mentioned in the other choices are correct.
Which of the letters in the above figure represents
the ovule? a. A b. B c. C d. D e. none of these
During aerobic respiration, what molecule is degraded for the formation of acetyl coenzyme A?
a. NAD b. FADH c. glucose d. pyruvate e. coenzyme A
What makes the cells of a developing embryo differentiate into various types of cells?
A) They have different genes. B) Different genes are activated. C) Once certain genes of a cell have caused it to differentiate, the other genes are lost. D) The DNA of their mitochondria is different. E) Special genes in the cytoplasm cause this differentiation.