Which condition is associated with an extra copy of chromosome 21?
a. sickle-cell anemia
b. Down syndrome
c. ALS
d. Epilepsy
e. Schizophrenia
ANSWER: b
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Cystic fibrosis is caused by mutations in the CF gene, and there are several different mutations that are known to result in CF disease. The CF mutations behave as recessive alleles to the WT CF allele
If two carriers that have different mutations in their CF genes have children what is the probability that one of their children will have CF disease? A. 100% B. 25% C. 50% D. 75%
Adenine and thymine form _______ hydrogen bonds between them, while cytosine and guanine form _______ bonds
A. 2 , 3 B. 3 , 4 C. 3 , 2 D. 4 , 3
The original atmosphere of Earth is thought to have been rich in
a. CO2, N2, H2, H2S, and CO. b. CO2, N2, O2, Ar, and Ne. c. CO2, N2, O2, Rn, and Ne. d. CO2, N2, H2, Kr, and Xe.
A regulatory circuit in which an inactive repressor is produced and requires a corepressor to be activated is said to be
a. negative inducible. b. negative repressible. c. constitutive. d. positive inducible. e. positive repressible.