Young birds see objects flying overhead and respond by crouching down into the nest and remaining still. Over time, some objects become familiar and the young birds do not crouch down. This type of learning is referred to as
A. operant conditioning.
B. sensitization.
C. associative learning.
D. habituation.
Answer: D
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The site where the two original DNA strands separate and active replication occurs is called the
A. replisome. B. lagging strand. C. replication fork. D. sliding clamp subunit. E. primosome.
A cell that neither gains nor loses water when it is immersed in a solution is what?
A. hypertonic to its environment. B. metabolically inactive. C. hypotonic to its environment. D. isotonic to its environment.
Which of the following statements is
INCORRECT about eukaryotic chromosomes?
a. The number of chromosomes varies from one species to another. b. All eukaryotes have the same system of autosomes and sex chromosomes. c. A chromosome consists of DNA associated with histone proteins. d. After duplication, all paired chromosomes are attached at the centromere. e. After duplication, each chromosome consists of two sister chromatids.
Refer to the accompanying figure. The structures labeled as 1 are used for:a
feeding. b. reproduction
c. attachment. d. movement. e. protection.