The receptors on T cells and B cells bind to _____
A) antibodies
B) antigens
C) natural killer cells
D) double-stranded RNA
E) immunoglobulins
Answer: B
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A geneticist examines a somatic cell from a fly during metaphase of mitosis and determines that 16 chromatids are present. If a germ-line cell from this species divides by meiosis, then at the end of meiosis I (including the first cytokinesis) each cell will contain
A. 8 chromosomes with 8 DNA molecules. B. 8 chromosomes with 16 DNA molecules. C. 4 chromosomes with 4 DNA molecules. D. 4 chromosomes with 8 DNA molecules. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you know about meiosis? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect 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?
Some members of an animal society may have greater success at reproduction as a result of:
a. dominance hierarchy. b. sexual selection. c. reproductive isolating mechanisms. d. dominance hierarchy along with sexual selection. e. dominance hierarchy along with sexual selection and reproductive isolating mechanisms.
While they are simple relative to cells, viruses often have a very diverse collection of components. Which one of the following choices is LEAST likely to be found as part of a virus?
A. proteins with functional binding sites B. glycoproteins C. single-stranded DNA D. ribosomes E. membrane components
In dogs, there is a hereditary deafness caused by a recessive allele, d. A kennel owner has a male dog that she wants to use for breeding purposes if possible. The dog can hear, but the owner is unsure of the genotype. She does a testcross (crosses it to a homozygous recessive dog), and two of the five offspring are deaf. This means that the male dog
A. has the genotype dd. B. is actually deaf. C. has the genotype Dd. D. has the genotype DD. E. is still of unknown genotype since there were offspring of both deaf and hearing phenotypes.