Match the cause with the disorder.
A. albinism
B. Down syndrome
C. red-green color blindness
D. hemophilia A
E. Turner syndrome
A. autosomal recessive inheritance resulting in abnormally low melanin levels
B. nondisjunction of the twenty-first chromosomal pair
C. X-linked recessive inheritance
D. X-linked recessive inheritance
E. nondisjunction of the sex chromosomes
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A scientist conducts a procedure that causes nitrogen atoms to gain neutrons. The resulting atoms will be:
A. ions of nitrogen. B. positively charged. C. negatively charged. D. isotopes of nitrogen. E. new elements with higher atomic numbers.
Science can best be described as
A) a search for the ultimate truth. B) a search for evidence that proves our concepts wrong. C) proving facts. D) a complete lack of dissent amongst ideas to obtain the truth.
The mouse 'Groomer' gene is expressed in the brain and tongue. In the brain, the Groomer gene makes a mature mRNA that includes exons 1, 3, 4, and 5. In the tongue, the Groomer gene makes a mature mRNA that includes exons 1, 2, 4, and 5. Which one of the following could reasonably explain these observations?
a. the Groomer pre-mRNA lacks a 5' cap in one of the tissues b. the Groomer pre-mRNA lacks a 3' poly(A) tail in one of the tissues c. the translation start codon in the Groomer gene has been mutated in one of the tissues d. exons in the Groomer pre-mRNA are alternatively spliced in the brain and tongue
All of these statements about Chlamydomonas are true EXCEPT ________.
A. Chlamydomonas only reproduces asexually B. each motile Chlamydomonas cell has a single haploid nucleus C. Chlamydomonas has two flagella D. Chlamydomonas is photoautotrophic