If pregnancy does occur, a layer of tissue from the embryo called the chorion begins to secrete which one of the following hormones?
A) GnRH
B) estrogen
C) FSH
D) hCG
E) LH
D
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In gymnosperms, which of the following structures or cell types would be considered spores? Select all correct choices
A. pollen precursor cells in the pollen cones B. mature pollen in the pollen cones C. seeds with the potential to germinate D. egg precursor cells in the ovule cones E. mature eggs in the ovule cones
Liverworts are the most primitive group of non-vascular plants.
a. Conifers b. Ginkophytes c. Cycads d. Gnetophytes
One turn of the Calvin cycle fixes a molecule of CO2 gas and is driven by 3 molecules of ATP and 2 molecules of NADPH from the light reactions. Which of the following is true?
A. It takes 3 turns of the cycle, 9 molecules of ATP, and 6 molecules of NADPH to make one molecule of glucose. B. It takes 6 turns of the cycle, 18 molecules of ATP, and 12 molecules of NADPH to make a glucose molecule. C. The cycle must be carried out in the dark. D. The cycle is exergonic.
Explain why color-blindness is much more common in males than in femalesWhat will be an ideal response?