If the first electron transfer chain in the lightdependent
reactions of photosynthesis was
stopped, which of the following would NOT be
generated?
a. oxygen gas
b. NADPH
c. ATP
d. ATP and NADPH
e. none of these would be generated
D
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Homologous chromosomes pair with each other during meiosis, but are misaligned. What is the likely outcome if crossing over occurs?
A. One daughter chromosome contains a gene duplication, the other three are normal. B. One daughter chromosome contains a gene deletion, the other three are normal. C. Two daughter chromosomes contain a gene duplication, the other two are normal. D. Two daughter chromosomes contain a gene deletion, the other two are normal. E. One daughter chromosome contains a gene duplication, one contains a gene deletion, and the remaining two are normal.
What would most likely result from histone acetylation and DNA methylation of the same section of a DNA molecule?
a. The nucleosomes would tightly coiled but remain transcriptionally active. b. Histone acetylation would cancel out epigenetic changes caused by DNA methylation. c. The histones would separate, but the exposed genes would not be transcribed. d. This combination of acetylation and methylation triggers histone replication.
The "powerhouse" of the cell is the
a. mitochondrion. b. Golgi body. c. nucleus. d. ribosome. e. endoplasmic reticulum.
The endotoxin of gram-negative bacteria is associated with
A. Mesosome B. Cytoplasmic membrane C. Capsule D. Cell wall