Dizygotic twins result from
A. one egg cell and two sperm cells.
B. one egg cell and one sperm cell.
C. two egg cells and one sperm cell.
D. two egg cells and two sperm cells.
Answer: D
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What may happen if the ductus arteriosus fails to close shortly after birth?
A. Blood may flow from the right atrium to the left atrium. B. The coronary arteries may have abnormally increased blood flow. C. The walls of the heart may become thin and flaccid. D. Blood may flow from the aortic arch to the lungs. E. Valvular stenosis may interrupt blood flow.
Match the form of RNA with its function:
1. rRNA 2. mRNAs 3. tRNA 4. microRNA A. Carries genetic instructions from the nucleus to the site of protein synthesis B. Uses an anticodon to guide its attached amino acid to the complementary codon on the mRNA at the ribosome C. Combines in a complex with proteins to make the large and small subunits of a ribosome D. Can suppress and silence certain mRNAs
The hormones and neurotransmitters released by the endocrine and nervous systems are chemical substances referred to as ________.
Fill in the blank(s) with the appropriate word(s).
What cartilage of the larynx is known as the Adam's apple?
A) cricoid B) thyroid C) arytenoid D) corniculate