Which of the following statements about hair cells is not true?
A. Their structure includes stereocilia and a kinocilium.
B. Bending of the cells triggers ion flow across the cell membrane.
C. They are found in the mammalian ear.
D. They are found in the fish lateral line system.
E. They can be repaired if they rupture.
Answer: E
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A substance that helps to maintain a stable pH is a(n) ________
Fill in the blank(s) with correct word
What is the leading cause of Down syndrome?
A) Aberrant implantation in the uterus leads to developmental problems in the fetus. B) In older females, chromosome 21 is duplicated leading to abnormal egg formation. C) The nondisjunctional event that produces Down syndrome occurs more frequently during oogenesis in women older than age 35. D) In older parents, there is egg/sperm incompatibility leading to duplication of chromosome 21. E) In men over 25, sperm formation is impaired and produces monosomic children.
One hypothesis for the adaptive function of sexual reproduction is that multiple harmful mutations can be combined in a single individual and thus be more effectively eliminated by natural selection.
a. true b. false
What is the sequence of the last three nucleotides of all mature tRNA molecules?
A. ACC B. CCA C. TGG D. GGT