During embryological development, if a certain gene on the Y chromosome is activated during the sixth or seventh week of development, the embryo will develop into a ________
Fill in the blank(s) with correct word
male
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The pathogen most frequently involved in causing clostridial myonecrosis is
A. Clostridium tetani. B. Streptococcus pyogenes. C. Clostridium septicum. D. Clostridium perfringens.
Which of the following hypotheses proposed to explain the evolutionary origin of viruses does not assume the pre-existence of living cells?
A. Viruses evolved from macromolecules. B. Viruses evolved from plasmids that acquired genes for their own replication. C. Viruses evolved by losing all the genetic information that is not absolutely required for reproduction. D. The precursors of cellular DNA genomes may have been RNA molecules. E. Viruses evolved from chromosomal elements.
The sodium-potassium pump functions to pump
What will be an ideal response?
Flattened sacs of internal membranes associated with photosynthesis are called
A. cristae. B. the stroma. C. thylakoids. D. photosystems. E. chloroplasts.