Amanda is a microbiologist who studies the pathogenic bacteria Streptococcus pyogenes. In what ways are they (Amanda and the bacteria) similar?
A. Both have mitochondria for ATP production.
B. Both obtain carbon from consuming organic molecules.
C. Both have linear chromosomes.
D. Both have cell walls.
E. Both are capable of sexual reproduction.
Answer: B
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What can you conclude from these results?
You are breeding different varieties of roses in your garden. When you cross a true-breeding yellow "Texas Beauty" rose with a true-breeding "Ruby" red rose, you get all red roses. But when you cross a "Texas Beauty" yellow with the yellow variety "Jealousy," you get a 9:7 ratio of red to yellow flowers! A. The environment, and not genes, influences pigment in these rose varieties. B. There are epistatic interactions between at least two genes for rose pigment. C. The red allele is dominant to the yellow allele. D. There is a mutation in the gene for yellow pigment in the "Jealosy" variety. E. There is no recessive allele for the red pigment gene.
A peptidoglycan-like polymer found in the cell walls of some Archaea is called ________.
Fill in the blank(s) with the appropriate word(s).
Epinephrine raises blood pressure by ____
a. increasing the strength and rate of the heartbeat b. decreasing the strength and rate of the heartbeat c. stimulating vasodilation d. reducing vasodilation e. decreasing blood flow to the heart, skeletal muscles, and lungs
Global warming can affect which of the following?
1.species distributions 2.oxygen carrying capacity of seawater 3.changes in rainfall and wind patterns 4.all of these