What is typical osmolarity of body fluids in most freshwater invertebrates?
a. about 225 mOsm/L
b. about 300 mOsm/L
c. about 1000 mOsm/L
d. about 1500 mOsm/L
Ans: a. about 225 mOsm/L
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A region of a chromosome contains two strands of DNA, yet only one is used to transcribe a gene because
A. both strands are transcribed, but only one strand of DNA contains a reading frame. B. all genes are found on the same strand of DNA in a chromosome. C. the start of transcription is random along the chromosome and doesn't always occur on a gene. D. RNA polymerase binds to the terminator, stopping transcription on one strand of DNA. E. RNA polymerase binds to the promoter, which precedes the gene only on the template strand of DNA.
What property describes the plasma membrane's ability to regulate movement of molecules into and out of the cell?
a. polarity b. integrity c. permeability d. solubility
What is the maximum net yield of ATP from anaerobic respiration?
a) 2 ATP b) 2-36 ATP c) 36-38 ATP d) 38-40 ATP
Which of the following is an example of positive feedback?
A) A rise in body temperature stimulates sweat. This causes the body to cool down to normal temp. B) Eating a sugary donut raises blood sugar. This stimulates the pancreas to release insulin. C) Your blood pressure falls below normal, so the nervous system increases heart rate to bring blood pressure back to a normal range. D) During childbirth, increasing levels of oxytocin hormone is released to increase the strength of uterine muscle contractions.