Which of the following most directly gives rise to secondary xylem and phloem?
a. protoderm
b. apical meristem
c. ground meristem
d. vascular cambium
e. procambium
D
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Recombination between sister chromatids produces new combinations of alleles that may be beneficial to the species
Indicate whether the statement is true or false
Cells are often ground up with abrasive to get to their internal enzymes/molecules, followed by removal of the abrasives
Here are two situations and two outcomes. What is the correct interpretation of the results? In situation #1, radioactive amino acids are mixed with ground-up cell material. Radioactive proteins are produced. In situation #2, radioactive amino acids AND the enzyme RNAse (an enzyme that degrades RNA) are mixed with ground-up cell material. No radioactive proteins are produced. A. The mRNA from the cell can be used to make proteins with the radioactive amino acids in the first situation. In the second situation, the mRNA is destroyed by the RNAse before it can be translated into protein containing the radioactive amino acids. B. The DNA from the cell can be translated into protein using the radioactive amino acids in the first situation. The RNAse in the second situation degrades the ribosomal RNA (rRNA), preventing ribosomes from forming and making proteins with the radioactive amino acids. C. The radioactivity in the amino acids corrupts the tRNA molecules, leading to no protein production in the second scenario. D. The results cannot be interpreted-there isn't enough information given in the question.
White blood cells are also called erythrocytes.
Answer the following statement true (T) or false (F)
Which of the following is not part of the process known as oxidative phosphorylation?
(a) Molecular oxygen serves as a final electron acceptor. (b) FADH2 and NADH become oxidized as they transfer a pair of electrons to the electron-transport chain. (c) The electron carriers in the electron-transport chain toggle between reduced and oxidized states as electrons are passed along. (d) ATP molecules are produced in the cytosol as glucose is converted into pyruvate.