There are __________ molecules of DNA in a
developing human sperm cell at the beginning of
prophase I.
a. 92
b. 23
c. 46
d. half as many (as compared to somatic cells)
e. twice as many (as compared to mature sperm)
Answer: a
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This initiator tRNA of the bacterium Escherichia is a modified form of the initiator tRNA used by the yeast Saccharomyces.
Answer the following statement true (T) or false (F)
The nucleolus plays a major role in synthesis of
A. tRNA. B. transcription activation proteins. C. rRNA. D. mRNA.
The accompanying figure shows that the rate of alarm calls made by black-tailed prairie dogs is dependent on a perceived threat by a predator. This behavior most closely approximates that predicted by ________
A) mutual benefit B) selfishness C) altruism D) spite
What statement below characterizes pigments’ function?
A. They absorb some photons. B. They reflect all photons. C. They absorb photons of all colors. D. They absorb photons of all wavelengths. E. They absorb ultraviolet wavelengths.