Answer the following questions true (T) or false (F)
1. It generally takes the enzymes from dozens of sperm for one sperm to gain access to the oocyte membrane.
2. Sperm cells do not need a nucleus and expel it during development as a weight-saving tactic.
3. Human embryos do not go through a morula stage of development as do most other animals.
1. TRUE
2. FALSE
3. FALSE
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Which of the following is false of brightfield microscopy?
A) White light is utilized. B) Light passes through the object being examined. C) Phase-contrast microscopy is a variant of brightfield microscopy. D) Specimens are always viewed without being stained. E) Specimens usually must be fixed.
What is the unifying or "core" theme of biology?
A) Evolution B) Energy transfer C) Nutrient recycling D) Hierarchical organization
In less-developed countries, many species are being harvested unsustainably because
A) they are hunted and killed because they carry human diseases. B) they are considered a danger to humans. C) pollution has reduced their population sizes dramatically. D) the people must eat or sell the species' products to survive. E) people thoughtlessly destroy what they do not need.
A female missing an X chromosome (XO) has Turner syndrome.
a. true b. false