Which option correctly describes the two strands of DNA in a double helix?
a. antiparallel in orientation
b. parallel in orientation
c. held together by covalent bonds between bases
d. identical
Ans: a. antiparallel in orientation
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What are somites?
a. neural tissue that gives rise to the cranial nerves b. neural tissue that give rise to the peripheral nerves c. neural tissue that gives rise to the two hemispheres of the brain d. mesoderm tissue that gives rise to the bones and skeletal muscles of the trunk e. mesoderm tissue that gives rise to the smooth muscles of the heart and lungs
Which major digestive process involves nutrient molecules passing across the mucosal layer of the gastrointestinal tract into the blood or lymph?
A) elimination B) absorption C) digestion D) secretion E) mechanical processing and movement
Given the sex determination system in bees, we can expect that
A) female bees will produce eggs by meiosis, whereas male bees will produce sperm by mitosis. B) female bees will produce eggs by mitosis, whereas male bees will produce sperm by meiosis. C) male and female bees will produce sperm and eggs by meiosis. D) male and female bees will produce sperm and eggs by mitosis.
How would blockage of the pancreatic duct affect the digestive system?
A) The small intestine would contain acidic, mostly undigested chyme. B) It would have little effect because liver enzymes would take over. C) The stomach would be unable to function. D) The food in the small intestine would be more basic (alkaline).