Creutzfeldt-Jacob disease is known to have been transmitted by surgical instruments and transplanted nerve tissue.
Answer the following statement true (T) or false (F)
True
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When a parent herring gull arrives at the nest with food, a chick will orient to and peck at the red spot on the parent's bill. The parent will then regurgitate the food into the chick's open mouth and the chick swallows it. What is this set of behaviors an example of?
A. sign stimulus B. fixed action pattern C. innate releasing mechanism D. taxis E. stimulus-response chain Clarify question: What is the key concept addressed by the question? What type of thinking is required? Gather Content: What do you already know about animal behaviors, specifically feeding behaviors in herring gulls? What other information is related to the question? Choose Answer: Given what you now know, what information is most likely to produce the correct answer? Reflection on Process: Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
In somatic cell division, a cell undergoes a nuclear division called ____, and a division of its cytoplasm called _____.
a) the cell cycle / cytokinesis b) meiosis / mitosis c) mitosis / cytokinesis d) prophase / cytokinesis e) mitosis / telophase
Asexual reproduction produces genetically identical individuals because
a. chromosomes do not have to replicate during asexual reproduction. b. it involves chromosome replication without cytokinesis. c. no meiosis or fertilization take place. d. cell division occurs only in meiosis. e. the mitotic spindle prevents nondisjunction.
If a recessive allele causes a fatal disease that kills the affected individual before he or she can reproduce, why doesn't that allele quickly become extinct in the population?
a. Alleles are never lost from a population. b. The homozygous dominant individuals protect the recessive allele in their genomes. c. The recessive allele is carried in the genome of heterozygotes, who do not suffer from the disease. d. The homozygous recessive individuals give their alleles to other individuals before they die from the disease.