Treponema pallidum
A. is missing several important genes essential for DNA replication.
B. requires protein factors found in blood.
C. lacks numerous biosynthetic pathways and thus has numerous nutritional requirements.
D. is missing the pathway for peptidoglycan synthesis.
Answer: C
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How many copies of each gene are present in these skin cells at G1 of interphase?
A. 2 B. 4 C. 6 D. 8
Neurotransmitters may be removed from the synaptic cleft by:
a. enzymatic breakdown or pumping back into presynaptic cells b. enzymatic breakdown only c. pumping back into presynaptic cells only d. neutralization by antibodies e. ionic degradation
What are the non-coding segments of DNA called?
a. introns b. exons c. promoters d. transcription factors e. knockouts
The “green revolution” to improve agricultural production ____
a. is based on large inputs of fertilizer b. does not require pesticides c. does not rely on modern irrigation d. produces crop yields ten times higher than tradition methods e. uses less energy than non-green methods