The chloroplast is a membrane-bound organelle that is surrounded by an outer membrane. Aside from the outer membrane of the chloroplast, how many other types of membranes can be found inside the chloroplast?
A. zero
B. one
C. two
D. three
E. four
Answer: C
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The geologic time scale is often subdivided on the basis of ____
a. the appearance of different radioactive isotopes in different strata b. levels of background extinction c. periods of mass extinction d. the appearance of new species e. climate change
Directional selection favors individuals who are at one end of a distribution of phenotypes
1.True 2.False
Which property is not used to classify viruses?
A) genome architecture B) tissue types infected C) presence or absence of an envelope D) capsid symmetry E) type of nucleic acid present
James is a 42-year-old man with hemophilia, a sex-linked recessive condition. His daughter, Susan, who has normal blood clotting, is married to Fred who also has hemophilia. Susan and Fred are expecting their first child and an ultrasound shows that the fetus is male. What is the approximate probability that their new son will have hemophilia?
A. 1/4 B. 1/2 C. 1 (100%) D. 3/4 E. 2/3