What special features are evident in sperm cells but not in somatic cells, and how do these specializations function?
What will be an ideal response?
Answer: Unlike somatic cells, sperm are haploid. They also have very little cytoplasm. They have a head with a compact nucleus covered by an acrosome filled with enzymes, and a mid-piece filled with mitochondria that power their movement. They are motile because of their tail, a structure containing a flagellum, which is specialized for movement.
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Which of the following statements about essential nutrients are true? Essential nutrients _____
I) are necessary for plant growth and reproduction II) are required for a specific structure or metabolic function III) cannot be synthesized by a plant IV) are produced by symbiotic bacteria A) I and IV B) II, III, and IV C) I, II, and III D) I, II, III, and IV
Which of the following are possible reasons for the high level of angiosperm diversity?
A. Animal pollinators will often find rare individuals, facilitating reproduction. B. Wind dispersal favors rare species, whereas insects are able to find common species.
As global temperatures increase, which of the following scenarios is most likely to happen?
A. Temperatures and humidity decrease. B. Sea surface temperatures and ocean heat content decrease. C. Glaciers and snow coverage decrease. D. Extreme weather events decrease.
Darwin was the first person to draw an evolutionary tree, a diagram that represents
A) records of breeding in domesticated animals. B) records of lineages in humans (also known as a family tree). C) evidence-based hypotheses regarding our understanding of patterns of evolutionary descent. D) groupings of organisms based on overall similarity.