In which of the following animals do blood vessels carry a mixture of oxygenated and

deoxygenated blood?



a. swordfish
b. blue-spotted salamander
c. hawk
d. kangaroo


B

Biology & Microbiology

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Which of the following is an assumption used in the molecular clock approach?

A) Nucleotide changes accumulate in a sequence in proportion to time. B) Nucleotide changes are generally NOT transferred to progeny. C) Nucleotide changes are NOT random. D) Nucleotide changes are subject to intense selective pressure.

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When prey populations are controlled by predators in a trophic level above them, they are said to be under ________ control

Fill in the blank(s) with correct word

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cDNA sequences are expressed sequence tags (EST) that identify protein coding genes. Indicate whether the statement is true or false

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The area where the optic nerve leaves the retina and where photoreceptors are absent is called the ________

A) optic area B) blind spot C) fovea D) cornea

Biology & Microbiology