Which of the following would prevent an organism from becoming part of the fossil record when it dies?
A) It is fully decomposed by bacteria and fungi.
B) It is buried in fine sediments at the bottom of a lake.
C) It gets trapped in sap.
D) It is frozen in ice.
Answer: A
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In an autosomal dominant disorder such as
Huntington's, two carrier parents have the probability of passing the gene on to ____ percent of their children.
a. 50 b. 0 c. 100 d. 25 e. 75
In humans, normal vision dominates color-deficiency, and both are X-linked. (The genes are located on the X chromosome.) A color-deficient male marries a woman who is heterozygous for normal vision. If they have a boy, the chance that he will be color-deficient is
A. 100%. B. 0%. C. 75%. D. 50%.
About 10 to 15% of African Americans are carriers of an autosomal recessive genetic disorder in which a defective version of hemoglobin is produced. What is the name of this disorder?
a. phenylketonuria b. Duchenne muscular dystrophy c. sickle cell anemia d. achondroplasia
The ________ sense internal and external stimuli, and send out responses in the form of chemical messengers called ________
A) meninges; axons B) cerebrospinal fluids; myelins C) muscles; chemokines D) dendrites; arachnoids E) neurons; neurotransmitters