Which of the following is not a function of the root of a plant?
A. Anchor the plant.
B. Produce energy that the plant can use to carry out metabolism.
C. Absorb water.
D. Absorb mineral nutrients for the plant.
E. Form beneficial relationships with microorganisms, thereby increasing the plant's ability to obtain nutrients.
Ans: B. Produce energy that the plant can use to carry out metabolism.
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The method of sequencing genomic fragments cloned straight from the genome is:
A. Cytogenetic mapping B. Shotgun sequencing C. Southern blotting D. Polymerase chain reaction
In a mature plant cell, ____ may occupy more than 90% of the cell's volume
a. the nucleus b. chromoplasts c. rough endoplasmic reticulum d. the central vacuole e. chloroplasts
Two solutions A and B are separated by a membrane, which is permeable to water but not salts. Solution A is a 2%
NaCl solution, while solution B is a 3% NaCl solution. Which of the following will occur? a. Water will move from side B to side A. b. Water will move from side A to side B. c. Salt will move from side B to side A. d. Salt will move from side A to side B. e. Neither salt or water will move across the membrane.
For a science fair project, two students decided to repeat the Hershey and Chase experiment, with modifications. They decided to label the nitrogen of the DNA rather than the phosphate. They reasoned that each nucleotide has only one phosphate and two to five nitrogens. Thus, labeling the nitrogens would provide a stronger radioactive signal than labeling the phosphates. Why won't this experiment work?
A. Amino acids (and thus proteins) also have nitrogen atoms; thus, the radioactivity would not distinguish between DNA and proteins. B. The phosphate in normal DNA is naturally radioactive. C. Although there are more nitrogens in a nucleotide, labeled phosphates actually have 16 extra neutrons; therefore, they are more radioactive. D. There is no radioactive isotope of nitrogen.