Blood leaves the heart and travels through arteries. It returns to the heart via veins. What type of blood vessels connect arteries and veins? Why are these vessels important?
What will be an ideal response?
Blood flows through capillaries. Capillaries are the smallest diameter blood vessels and they are very important because they are the site of exchanges with interstitial fluid occur. Transfers of gases (oxygen and carbon dioxide), nutrients, and wastes between blood and cells take place by diffusion across the thin walls.
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Which microbial grouping is the major oxygenic phototroph in most salt lakes?
A) cyanobacteria B) Dunaliella, a eukaryotic alga C) halophilic Archaea D) purple nonsulfur bacteria
Sometimes a fertilized egg, after a few of rounds of division, separates into two embryos which results in identical, or ____ , twins
Fill in the blank with the appropriate word.
The production of NADH takes place during the ________ stage(s) of glycolysis
A) energy-conservation B) energy-investment C) lysis D) lysis and energy-investment E) energy-investment and energy-conservation
Which of the following is a correct sequence of processes that takes place when a flowering plant reproduces?
A) meiosis ? fertilization ? pollination ? germination B) fertilization ? meiosis ? nuclear fusion ? formation of embryo and endosperm C) meiosis ? pollination ? nuclear fusion ? formation of embryo and endosperm D) growth of pollen tube ? pollination ? germination ? fertilization E) meiosis ? mitosis ? nuclear fusion ? pollination