What statement is correct in the following statment?
A. Speciation that begins with geographic isolation is known as allopatric speciation
B. Allopatric speciation only happens in dispersal geographic isolation
C. Speciation that begins with geographic isolation is known as sympatric speciation
D. Sympatric speciation only happens in dispersal geographic isolation
Ans: A. Speciation that begins with geographic isolation is known as allopatric speciation
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The botulism toxin ____
a. is an endotoxin b. is produced by an extremophile c. may be found as a contaminant in expired food d. is marketed as Botox e. causes muscles to contract
It is late at night and you are walking along a
dark sidewalk. In the bushes next to the sidewalk you hear something moving. Your heart starts beating fast, your pupils dilate, and you become very anxious. The neurotransmitter creating this effect is
a. acetylcholine. b. norepinephrine. c. dopamine. d. serotonin. e. an endorphin
For the question below, suppose that the somatic cells of humanoid X contain a total of 4 chromosomes [2N = 4] (or 2 pairs of chromosomes, [N = 2])
How many chromatids and chromosomes are present at the following stages of MEIOSIS? Answers should be filled in for the blank spaces in the table below. Stage # of CHROMATIDS # of CHROMOSOMES Anaphase I of MEIOSIS Anaphase II of MEIOSIS Gamete (sperm of egg) Prophase I of MEIOSIS Prophase II of MEIOSIS
Deficiencies of brush border enzymes in the small intestine would not affect the complete digestion of ________.
A. DNA and RNA B. sucrose C. proteins D. starch E. fats