Which of the following statements is false about
human chorionic gonadotropin?
a. It is initially secreted by the blastocyst.
b. It stimulates the corpus luteum to continue
secreting progesterone and estrogens.
c. Once it forms, the placenta secretes the
hormone.
d. It prevents the uterine lining from sloughing off.
e. The earliest it can be detected in the urine is
seven weeks after conception.
Answer: e
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Each DNA nucleotide is composed of ____
a. a six-carbon sugar, a phosphate group, and one of twenty amino acids b. a five-carbon sugar, a nitrogenous base, and one of twenty amino acids c. a five-carbon sugar, a phosphate group, and one of four nitrogenous bases d. a six-carbon sugar, a nitrogenous base, and one of four amino acids e. a five-carbon sugar, a phosphate group, and one of four amino acids
DNA can be transferred from one bacterial cell to another by ____
a. conjugation only b. transformation only c. conjugation and transformation only d. conjugation and transduction only e. conjugation, transformation, and transduction
Which RNA is the first to be activated in the
process of protein synthesis?
a. mRNA b. tRNA c. rRNA d. dRNA e. sRNA
The Eukarya split from the Archaea approximately:
A) 2.5 billion years ago. B) 4 billion years ago. D) 4 million years ago. E) 2.5 million years ago.