Fish have scales that enable them to live in a water environment. This is an example of
A. metabolism.
B. homeostasis.
C. cellular organization.
D. development.
E. adaptation.
Answer: E
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Membrane potential will affect the directional movement of
A. Glucose (C6H12O6) B. Cholesterol C. Potassium (K+) D. Oxygen (O2)
The phase at the end of an action potential when the membrane potential becomes more negative than it is at rest is the ________ phase.
A) threshold B) depolarizing C) repolarizing D) hyperpolarizing E) refractory
Answer the following statements true (T) or false (F)
1. If a woman in her late forties wants to have a baby and seeks medical advice, she would most likely be advised of the risks related to nondisjunction occurring and a higher rate of fetal chromosomal abnormality. 2. Identical twins result from one zygote splitting into two genetically identical embryos. 3. Without genetic diversity, a population might more easily fall victim to parasites and pathogens. 4. Caenorhabditis elegans is a hermaphrodite, which means it only undergoes sexual reproduction. 5. In animals, each gamete arises from a diploid cell containing two sets of homologous chromosomes.
Assume short hair (L) is dominant to long hair (l), and black hair (B) is dominant to brown (b). If you
found a black, short-haired animal, you could determine its genotype by crossing it to an animal with a genotype of a. LL BB. b. ll BB. c. ll Bb. d. ll bb. e. LL bb.