Dmitri Ivanovski demonstrated that TMV was not spread via bacteria by
A. transmitting sap of infected plants from generation to generation.
B. filtering sap from an infected plant through pores smaller than bacteria, and then applying it to a healthy plant.
C. spraying sap from an infected plant onto a healthy plant.
D. sterilizing sap from an infected plant and then applying it to a healthy plant.
E. treating an infected plant with a broad spectrum of antibiotics before extracting sap.
B. filtering sap from an infected plant through pores smaller than bacteria, and then applying it to a healthy plant.
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Which of the following statements best describes Figure 18.7 graph (b), which depicts Galton's data showing distribution of offspring height from the shortest parents he studied?
A. The parental mean for the shortest parents is larger than the mean height of their offspring. B. The parental mean for the shortest parents is smaller than the mean height of their offspring. C. Offspring from the shortest parents are taller than most members of the population. D. The average height of the shortest parents is greater than the mean height of the population. E. None of these answer options is correct.
In the accompanying figure, the structure labeled “H” is a ____
a. muscle fiber b. sarcoplasmic reticulum c. mitochondria d. myofibril e. Z line
The 3 parts of sperm are the head, middle piece and _______________
A. Acrosome cap B. Head C. Midpiece D. Flagellum E. Tail
In comparing DNA replication with RNA transcription in the same cell, which of the following is true only of replication?
A. It uses RNA polymerase. B. The entire template molecule is represented in the product. C. The process occurs in the nucleus of a eukaryotic cell. D. It makes a new molecule from its 5' end to its 3' end. E. The process is extremely fast once it is initiated.