Decomposing organic material that releases nutrients that are used by plants is called ____.
A. humus
B. loam
C. silt
D. bedrock
E. a macronutrient
Answer: A
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The veins of leaves are _____
I) composed of xylem and phloem II) continuous with vascular bundles in the stem and roots III) finely branched to be in close contact with photosynthesizing cells A) only I B) only II C) only III D) I and III E) I, II, and III
Choose the true statements about the human and mouse genomes.
_____ The human genome shares 99% of its genes with the mouse genome. _____ A comparison of genomes confirms that mice and humans shared a common ancestory more recently than humans and pufferfish. _____ Very few genes are conserved in the two genomes. _____ Little rearrangement of genes has occurred in the two genomes.
Which of the following female organisms do
NOT contain XX chromosomes?
a. humans b. fruit flies c. cows d. butterflies e. cats
Multiple effects of a single gene is known as
a. expressivity. b. penetrance. c. codominance. d. pleiotropy. e. multiple alleles.