The hollow space within the blastocyst is the

a. trophoblast.
b. amnion.
c. blastocoel.
d. chorion.
e. placenta.


C

Biology & Microbiology

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Which three of the following groups are most commonly used to covalently modify an enzyme and its activity? (Check all that apply.)

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Biology & Microbiology

Plants and algae most recently shared a common ancestor 480 million years ago, and plants colonized land shortly after that. Light, water, minerals, and dissolved gases surround the whole body of a submerged green alga, and the buoyancy of water provides physical support. What adaptation did plants have to make in taking up gasses without drying out when they moved to dry land?

a. Production of pollen b. Development of stomata c. Development of vascular tissue d. Production of a cuticle e. Production of lignin

Biology & Microbiology

Which of the following is/are NOT considered a part of the lower respiratory system?

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Biology & Microbiology

The left hemisphere of the brain is more involved in verbal functions than the right hemisphere.

Answer the following statement true (T) or false (F)

Biology & Microbiology