The honeycomb made by bees is made up primarily of ____.
A. carbohydrates
B. nucleotides
C. proteins
D. lipids
E. amino acids
Answer: D
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What is responsible for termination of transcription in eukaryotic protein-coding genes?
A) a polyadenylation signal or poly(A) B) a termination loop composed of guanine C) a sigma factor D) a portion of the polymerase holoenzyme E) three nonsense mutations in sequence
Red-green color blindness is a sex-linked recessive trait in humans. Two people with normal color vision have a color-blind son. What are the genotypes of the parents?
A) XnXn and XnY B) XNXN and XnY C) XNXN and XNY D) XNXn and XNY
In temperate deciduous forests, trees drop their leaves in response to reduced sunlight
Indicate whether the statement is true or false
Which action is unable to produce variation?
A. Crossing over B. Random alignment of chromosomes during meiosis C. Asexual reproduction D. Genetic recombination of alleles E. Sexual reproduction