Which fetal blood vessel carries oxygen-rich blood from the placenta to the fetus?
a. umbilical vein
b. umbilacal arteries
c. ductus arteries
d. ductus venosus
Ans: a. umbilical vein
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In your textbook, there is a discussion of the experiment by Wigglesworth that demonstrated that PTTH (prothoracicotropic hormone) triggers molting and the release of ecdysone
In 1984, Nagasawa et al. published a paper entitled: "Amino-terminal amino acid sequence of silkworm prothoracicotropic hormone: homology with insulin." The similar amino acid sequence between PTTH and insulin suggests that: A. a common ancestral peptide evolved into peptides with different functions in insects and invertebrates. B. if PTTH were given to vertebrates it would likely trigger glucose uptake by cells. C. insulin causes molting in vertebrates.
Which of the following statements regarding transcription only apply to eukaryotes and not to prokaryotes?
A. A single RNA polymerase transcribes genes that encode mRNAs, tRNAs, and rRNA. B. Sigma (?) subunit detaches from RNA polymerase shortly after transcription has initiated. C. The C-terminal domain of the polymerase is phosphorylated after transcription has initiated. D. RNA synthesis is inhibited by actinomycin D. E. RNA synthesis is inhibited by rifampicin.
The neurotransmitter released from the nerve terminus at the neuromuscular junction is ________.
A. troponin B. acetylcholine C. Ca2+ D. tropomyosin
Mordants increase the binding between a stain and specimen.
Answer the following statement true (T) or false (F)