Which of the following groups provides protection and nourishment to the embryo?
A. all plants
B. angiosperms only
C. gymnosperms only
D. lycophytes only
E. bryophytes only
Answer: A. all plants
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In the absence of oxygen, can cells utilize the electron transport chain?
A. No, oxygen is a required cofactor for the complexes in the electron transport chain. B. Yes, in the case that a cell can use a terminal electron acceptor other than oxygen, it can make use of the electron transport chain. C. No, oxygen is the primary electron acceptor in electron transport chains in all cell types. D. Yes, all cells can make use of the electron transport chain in the absence of oxygen via fermentation.
During which stage do two tRNAs properly align their two amino acids so that they may be chemically attached to one another?
A. translation B. transcription C. replication D. mutation
You are conducting a genetic screen using Caenorhabditis elegans embryos to isolate mutations affecting anaphase (A). Therefore, you need to look for embryos in which
A. sister chromatids are mismatched and therefore fail to separate. B. the centromeres do not move toward the poles. C. the spindle apparatus does not disassemble. D. the poles do not move apart.
The organisms that causes toxic shock syndrome is ________.
A. Lactococcus lactis B. Staphylococcus epidermidis C. Streptococcus pneumoniae D. Staphylococcus aureus