Refer to the accompanying figure. At what point of this life cycle does fertilization occur?
a. 1
b. 4
c. 6
d. 7
e. 8
b
You might also like to view...
In a nucleotide, to which carbon in the sugar is the base attached?
A. 1' B. 2' C. 3' D. 4' E. 5'
Scientific inquiry in biology is linked in a concept map with two sets of understanding researchers might pursue in experiments. Which of these is a good example of why concepts are linked between what is studied and how it might be studied?
A. Environmental changes over recent decades have led to studies of whether specific plants and animals can adapt to the changes. B. A research physician hypothesizes that a new skin therapy will result in healthier skin tissues for healing. C. The influenza virus is spreading rapidly throughout the population and is not being controlled by the current flu medication. D. All of the answer choices are correct. E. A newly identified bacterium in African soils is found to promote plant growth that a researcher will study in crop production.
During receptor-mediated endocytosis
a. plasma membrane receptors bind molecules to be enclosed. b. a small pit forms beneath the receptors. c. a pit closes back on itself. d. a vesicle forms. e. all of these occur
The oldest proposed cell microfossils come from structures called _____.
A. stromatolites B. crystal filaments C. hydrothermal vents D. pyrite E. tectonic plates