Which of the following would be a reasonable explanation of why the chloroplast would use the cyclic electron pathway as well as the noncyclic electron pathway?
A) The noncyclic electron pathway does not provide enough NADPH for the cell.
B) The noncyclic electron pathway does not provide enough oxygen for the cell.
C) The Calvin cycle utilizes more NADPH than ATP and the cyclic electron pathway produces NADPH.
D) The Calvin cycle utilizes more ATP than NADPH and the cyclic electron pathway produces ATP.
E) The cyclic electron pathway only runs when oxygen is limiting.
Ans: D) The Calvin cycle utilizes more ATP than NADPH and the cyclic electron pathway produces ATP.
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Excavates lack ________
Fill in the blank(s) with correct word
During the replication of DNA, DNA polymerase has to synthesize the daughter strand in the 5' to 3' direction because DNA polymerase can only join nucleotides to the 3' end of the growing new strand.
Answer the following statement true (T) or false (F)
If tyrosine and isoleucine undergo condensation, where does the new bond form?
a. Between carbon of the R group and the nitrogen of the amino group b. Between oxygen of the R group and the hydrogen of the amino group c. Between carbon of the carboxyl group and the hydrogen of the R group d. Between carbon of the carboxyl group and the hydrogen of the amino group e. Between carbon of the carboxyl group and the nitrogen of the amino group
The product of the p53 gene _____
A) inhibits the cell cycle B) slows down the rate of DNA replication by interfering with the binding of DNA polymerase C) causes cells to reduce expression of genes involved in DNA repair D) allows cells to pass on mutations due to DNA damage